Quartz cause identification method based on scanning electron microscope multi-mode signal fusion

Abstract

The invention discloses a quartz cause identification method based on scanning electron microscope multi-mode signal fusion, which only uses a scanning electron microscope equipped with an energy spectrum probe, a cathode luminescence probe and a back scattering electron diffraction probe. A plurality of index factors such as a CL girdle width variation coefficient a, an Al-Ti influence coefficient b, a lattice orientation difference influence coefficient c and an inclusion type relative specific gravity coefficient d are comprehensively adopted to judge that the quartz sample is a hydrothermal cause or a metamorphic cause. According to the invention, rapid and accurate identification of quartz causes is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of geological mineral exploration, and particularly relates to a quartz genesis identification method based on scanning electron microscope multi-modal signal fusion. BACKGROUND

[0002] Quartz is ubiquitous in various rocks, and the judgment of quartz genesis is crucial for studying the genesis of the hosting rock and geological significance. However, the traditional petrographic method, which relies on the observation of paragenetic mineral assemblages by optical microscope, is highly subjective and cannot achieve micro-area analysis, such as microscale analysis of <10 μm. Isotopic analysis, such as oxygen isotope δ 18 O, requires destructive sampling and has a long test cycle (3-5 working days), high cost (single sample > 500 yuan). Cathodoluminescence (CL) can reflect quartz growth zoning, but lacks composition and structure data support; Energy dispersive spectroscopy (EDS) can detect trace elements, but cannot distinguish crystal defect characteristics related to genesis.

[0003] In summary, the existing quartz genesis identification method relies on manual macroscopic observation, has high cost, cannot achieve micro-area non-destructive analysis, and has low accuracy of identification results due to single identification index factor. SUMMARY

[0004] In view of the above analysis, the present application aims to provide a quartz genesis identification method based on scanning electron microscope multi-modal signal fusion, to solve at least one of the problems in the prior art that quartz genesis identification relies on manual macroscopic observation, has high cost, cannot achieve micro-area non-destructive analysis, and has low accuracy of identification results due to single identification index factor.

[0005] The main purpose of the present application is achieved by the following technical solutions:

[0006] A quartz genesis identification method based on scanning electron microscope multi-modal signal fusion, comprising the steps of:

[0007] S1, preparing a quartz sample rock thin section:

[0008] S2, using a scanning electron microscope to collect multi-modal data of the to-be-measured area of the rock thin section, and calculating to obtain a CL ring width variation coefficient a, an Al-Ti influence coefficient b, a lattice orientation difference influence coefficient c, and a type of inclusion relative specific gravity coefficient d;

[0009] S3, based on the CL ring width variation coefficient a, the Al-Ti influence coefficient b, the lattice orientation difference influence coefficient c, and the type of inclusion relative specific gravity coefficient d, determining whether the quartz sample is of hydrothermal origin or metamorphic origin.

[0010] Further, step S2 comprises:

[0011] S21, using a backscattered electron probe to receive the backscattering signal of quartz in the to-be-measured region on the rock thin section, to obtain the morphology and inclusion characteristics of all quartz particles in the to-be-measured region, to determine the type and number of inclusions in each quartz particle; based on the number N1 of gas-liquid inclusions and the number N2 of metamorphic mineral inclusions of all quartz particles in the to-be-measured region, the relative proportion coefficient d of inclusion type is calculated according to the following formula:

[0012] When N1>N2, d=0.5. ;

[0013] When N1≤N2, d=0.

[0014] Further, step S2 further comprises:

[0015] S22, using a cathodoluminescence probe to perform cathodoluminescence analysis on the same to-be-measured region of the rock thin section, to measure the zonewidth of the CL zonewide, to obtain the widest zonewide W max and the narrowest zonewide W min ; the zonewidth variation coefficient a of the CL zonewide is calculated according to the following formula:

[0016] a=W max / W min ;

[0017] Wherein, W max is the widest zonewide W max , um; W min is the narrowest zonewide, um.

[0018] Further, step S2 further comprises:

[0019] S23, using an energy spectrum probe to perform energy spectrum (EDS) micro-area composition detection on the same to-be-measured region of the rock thin section, to determine the Al and Ti element content; the Al-Ti influence coefficient b is calculated according to the following formula:

[0020] b=Al 含量 / Ti 含量

[0021] Wherein, Al 含量 is the Al content value of the quartz zonewide energy spectrum data, %; Ti 含量 is the Ti content value of the quartz zonewide energy spectrum data, %.

[0022] Further, step S2 further comprises:

[0023] S24, adjust the sample stage switching rock thin section tilt angle, and focus the backscattered electron probe to the to-be-measured area in the rock thin section again; after the gathering is completed, the EBSD crystal structure analysis of the quartz particles in the to-be-measured area is carried out again by using the backscattered electron diffraction probe, and the lattice orientation difference influence coefficient c of the quartz particles is calculated according to the following formula:

[0024] ;

[0025] Wherein, n is the number of all quartz particles; alpha max is the maximum lattice orientation difference in all quartz particles, °; alpha min is the minimum lattice orientation difference in all quartz particles, °; alpha i is the lattice orientation difference of the i-th quartz particle, °.

[0026] Further, in step S3, the genesis of the quartz sample is determined according to the following identification model formula:

[0027] If a+b+c+d≥Q, it is determined to be hydrothermal genesis;

[0028] If a+b+c+d<Q, it is determined to be metamorphic genesis;

[0029] Wherein, Q is the critical value of quartz genesis and metamorphic genesis.

[0030] Further, it further includes the steps of: establishing a quartz sample measurement database of known hydrothermal genesis and metamorphic genesis, and constantly updating the measured a 实测 , b 实测 , c 实测 , d 实测 values of the known genesis quartz samples in the database, and then adjusting the critical value Q according to the constantly updated measured a 实测 , b 实测 , c 实测 , d 实测 value data in the database.

[0031] Further, step S1 includes:

[0032] S11, cut the collected quartz sample into a cuboid sample block, mechanically grind and argon ion polish the cuboid sample block to make the surface flat, and prepare a rock thin section with a size of 2cm×2cm;

[0033] S12, spray 5~10 nm carbon film on the rock thin section in a vacuum coating instrument to complete the preparation of the rock thin section.

[0034] Further, the scanning electron microscope is equipped with a backscattered electron probe, an energy spectrum probe, a cathodoluminescence probe and a backscattered electron diffraction probe.

[0035] Further, the scanning electron microscope is also equipped with a sample stage.

[0036] Further, the sample stage comprises:

[0037] A plug-in base, a lower part of the plug-in base is arranged on the mounting base;

[0038] A rotating arm, a bottom of the rotating arm is hinged to an upper part of the plug-in base;

[0039] A driving mechanism, which is drivingly connected with the rotating arm, is used to drive the rotating arm to rotate;

[0040] A substrate stage, a bottom surface center of the substrate stage is connected with a top of the rotating arm;

[0041] A gravity center maintaining mechanism, which is connected to a bottom of the substrate stage, is used to move in association with the rotating arm after the rotating arm is inclined relative to the plug-in base, so that the gravity center of the rotating arm and the substrate stage is maintained in a vertical direction of the plug-in base.

[0042] Further, the plug-in base comprises a plug-in base and a plug-in piece, an inside of the plug-in base is hollow, the driving mechanism comprises a linear driving motor and a driving gear plate, the plug-in base is arranged at one end of the linear driving motor, a driving shaft of the linear driving motor is arranged into the plug-in base, the plug-in piece is arranged at the other end of the linear driving motor, the driving gear plate is connected with the driving shaft of the linear driving motor, a hinge shaft is arranged on a side of the plug-in base, the hinge shaft is rotatable, a gear slot is arranged on a side wall of the plug-in base, the driving gear plate is engaged with the hinge shaft, and a part of the rotating arm outside the plug-in base is connected with the hinge shaft.

[0043] Further, the gravity center maintaining mechanism comprises:

[0044] A slide rail, which is connected to the bottom of the substrate stage, is arranged in axial symmetry with the rotating arm;

[0045] A counterweight piece, which is slidingly connected with the slide rail;

[0046] A counterweight driving mechanism, which is arranged at the bottom of the substrate stage, is used to drive the counterweight piece to move to a predetermined position when the rotating arm rotates in a first direction or a second direction opposite to the first direction, so that the center of the substrate stage and the counterweight piece as a whole is maintained in the vertical direction of the plug-in base.

[0047] Further, the slide rail comprises a hanger and a meandering track, one end of the hanger is connected to the meandering track, the other end of the hanger is connected to the bottom of the substrate stage, the counterweight piece is provided with a sliding hole, the counterweight piece is arranged on a lower horizontal frame of the meandering track and can slide relative to the horizontal frame.

[0048] Further, the counterweight driving mechanism comprises a synchronous belt, a pulley, a wheel frame and a gear set, the pulley is arranged at the outer side of the two ends of the slide rail, the pulley is rotationally connected to the wheel frame, the wheel frame is connected to the base plate table, the synchronous belt is meshingly connected to the pulley, the gear set is drivingly connected to the synchronous belt, the hinge shaft is meshingly connected to the gear set, and the synchronous belt is connected to the counterweight.

[0049] Further, the gear set comprises a first gear, a second gear, a conversion shaft, a shaft sleeve and a third gear, the first gear is sleeved on the end of the hinge shaft extending outside, the rotating arm is provided with a mounting hole, the third gear is arranged in the mounting hole, the conversion shaft is rotationally connected to the rotating arm, one end of the conversion shaft is arranged in the mounting hole and connected to the third gear, the opposite end is arranged outside the rotating arm and extends to a position above the first gear, the second gear is meshingly connected to the first gear, the shaft sleeve is sleeved on the conversion shaft and connected to the rotating arm, and the synchronous belt is arranged in the mounting hole and meshingly connected to the third gear.

[0050] Further, the table top of the base plate table is further provided with a sliding groove, a clamping rail is arranged in the sliding groove, two sliding seats are arranged on the clamping rail, the sliding seats are slidable relative to the clamping rail, a positioning member is arranged at the middle position of the clamping rail, an elastic pull rope is arranged between the positioning member and the sliding seat, one end of the elastic pull rope is connected to the positioning member, the opposite end is connected to the sliding seat, a v-shaped clamping claw is hingedly arranged on the sliding seat, the clamping claw comprises a clamping side wing and a connecting side wing, a spring is connected to the connecting side wing, the spring is further connected to the sliding seat, the clamping side wing is located on the table top of the base plate table, and the clamping side wing can rotate about the connecting side wing as the rotation axis.

[0051] Compared with the prior art, the present application has at least one of the following beneficial effects:

[0052] a) The quartz genesis identification method based on the multi-modal signal fusion of the scanning electron microscope provided by the present application can complete the judgment of the quartz genesis by using only one scanning electron microscope equipped with a spectrum probe, a cathodoluminescence probe and a backscattered electron diffraction probe, thereby significantly improving the work efficiency, and the single sample full-process analysis time is less than 2 hours, which is about 80% shorter than the full-process analysis time of the isotopic method.

[0053] b) The quartz genesis identification method based on the multi-modal signal fusion of the scanning electron microscope provided by the present application comprehensively uses the CL ring width variation coefficient a, the Al-Ti influence coefficient b, the crystal lattice orientation difference influence coefficient c and the inclusion type relative specific gravity coefficient d multiple index factors, directly substitutes the multiple index factor values into the proposed identification model formula, and can quickly obtain the identification result of the quartz genesis, thereby overcoming the problems of the prior art, such as high cost, inability to realize micro-area nondestructive analysis, lack of standardized process and single identification index factor, which leads to poor accuracy of the identification result, and significantly improving the accuracy of the identification result.

[0054] The technical solutions in the present application can be combined with each other to realize more preferred combination solutions. Other features and advantages of the present application will be described in the following description, and some advantages will become apparent from the description, or will be understood by those skilled in the art through implementation of the present application. The purposes and other advantages of the present application can be realized and obtained through the contents particularly pointed out in the description and the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0055] The accompanying drawings are included to provide a further understanding of the present application, and are incorporated herein and constitute a part of the detailed description. The drawings illustrate embodiments of the present application and, together with the description, serve to explain the principles of the present application. In the drawings:

[0056] Figure 1 An operation flow chart of a quartz genesis identification method based on scanning electron microscope multi-modal signal fusion provided for Embodiment 1;

[0057] Figure 2 An overall structure schematic view of a sample stage provided for Embodiment 2;

[0058] Figure 3 A structure schematic view of a bottom view of the sample stage in Figure 2 ;

[0059] Figure 4 A structure schematic view of a gravity center maintaining mechanism provided for Embodiment 2;

[0060] Figure 5 An enlarged structure schematic view of an A area in Figure 2 ;

[0061] Figure 6 An enlarged structure schematic view of a B area in Figure 4 ;

[0062] Figure 7 An enlarged structure schematic view of a C area in Figure 4 ;

[0063] Figure 8 A structure schematic view of a substrate stage provided for Embodiment 2;

[0064] Figure 9 An enlarged structure schematic view of a D area in Figure 8 ;

[0065] LIST OF REFERENCES:

[0066] 10, plug-in base; 101, plug-in stage; 102, plug-in piece; 11, mounting seat;

[0067] 20, rotating support arm; 201, mounting hole;

[0068] 30, base plate; 31, sliding groove; 32, clamping rail; 33, sliding seat; 34, positioning member; 35, elastic pull rope; 36, clamping claw; 361, clamping side wing; 362, connecting side wing;

[0069] 40, gravity center maintaining mechanism; 401, sliding rail; 4011, hanger; 4012, meandering track; 402, counterweight; 403, synchronous belt; 4031, pushing member; 4032, through hole; 404, pulley; 405, first speed changing wheel; 406, second speed changing wheel; 407, conversion shaft; 408, shaft sleeve; 409, third speed changing wheel;

[0070] 50, linear drive motor; 51, drive toothed plate; 52, hinge shaft. DETAILED DESCRIPTION

[0071] The preferred embodiments of the present application will be described in detail below with reference to the drawings, in which the figures constitute a part of the present application and illustrate the principles of the present application together with the embodiments of the present application, but are not intended to limit the scope of the present application.

[0072] In the description of the embodiments of the present application, it should be noted that unless otherwise explicitly specified and limited, the term "connected" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected, which can be mechanically connected, or it can be electrically connected, which can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above-mentioned term in the present application can be understood according to the specific circumstances.

[0073] The terms "top", "bottom", "above", "under" and "on" used throughout the description are relative positions of the components of the device, for example, the relative positions of the top and bottom substrates inside the device. It can be understood that the device is multifunctional, regardless of their orientation in space.

[0074] Embodiment 1

[0075] In one specific embodiment of the present application, a quartz genesis identification method based on scanning electron microscope multi-modal signal fusion is disclosed, comprising steps S1 to S3:

[0076] S1, preparing a quartz sample rock thin section.

[0077] S11, cutting the collected quartz sample into a cuboid sample block, mechanically grinding and argon ion polishing the cuboid sample block to make the surface flat, and preparing a rock thin section with a size of 2cm x 2cm;

[0078] S12, spraying 5~10 nm carbon film on the prepared rock thin section in a vacuum coating instrument to enhance the electrical conductivity, and completing the preparation of the rock thin section.

[0079] S2, using a scanning electron microscope (SEM) to perform multi-modal data acquisition on the to-be-measured region of the prepared rock thin section, and calculating to obtain a plurality of index data, including a CL zoning width variation coefficient a, an Al-Ti influence coefficient b, a lattice orientation difference influence coefficient c, and a type of inclusion relative proportion coefficient d.

[0080] The scanning electron microscope used in this embodiment is equipped with a backscattered electron probe, an energy spectrum probe, a cathodoluminescence probe, and a backscattered electron diffraction probe.

[0081] The scanning electron microscope in this embodiment is also equipped with a sample stage. The thin section sample is placed on the sample stage, and the sample thin section can be adhered to the surface of the sample stage using double-sided tape and then left for testing.

[0082] S21, using the backscattered electron probe to receive the backscattered signal of quartz in the to-be-measured region of the rock thin section, obtaining the morphology and inclusion characteristics of all quartz particles in the to-be-measured region, and determining the type and number of inclusions in each quartz particle; based on the number N1 of gas-liquid inclusions and the number N2 of metamorphic mineral inclusions in all quartz particles in the to-be-measured region, the type of inclusion relative proportion coefficient d is calculated according to the following formula:

[0083] When N1>N2, d=1. ;

[0084] When N1≤N2, d=0; at this time, it can be directly determined that it is of metamorphic origin.

[0085] In this step, backscattered electron (BSE) imaging is used, and the working conditions of an acceleration voltage of 20 kV and a beam current of 10 nA are adopted to identify the type of inclusions in all quartz particles in the to-be-measured region of the rock thin section, and to count the total number of gas-liquid inclusions and the total number of metamorphic mineral inclusions in all quartz particles in the to-be-measured region, which are N1 and N2 respectively.

[0086] In this embodiment, the minimum to-be-measured region size can reach 5 μm x 5 μm.

[0087] S22, using the cathodoluminescence probe to perform cathodoluminescence analysis on the same to-be-measured region of the rock thin section at this position, measuring the zoning width of the CL zoning, and calculating to obtain the CL zoning width variation coefficient a based on the zoning width.

[0088] Specifically, the cathodoluminescence probe is used to collect luminescence images in a low beam current mode to identify the zoning structure or diffuse luminescence structure of quartz; during cathodoluminescence analysis, the wavelength range is 300-800 nm, the current in the low beam current mode is 10 nA, and the acceleration voltage is 10 kV. At the same time, the measurement tool of the scanning electron microscope is used to measure the width of the CL zoning to obtain the widest zoning W max and the narrowest zoning width Wmin Based on the widest ring band width W max and the narrowest ring band width W min , the CL ring band width variation coefficient a is calculated according to the following formula:

[0089] a = W max / W min ;

[0090] Wherein, W max is the widest ring band W max , um; W min is the narrowest ring band width, um.

[0091] S23, using the energy spectrum probe to detect the same area of the rock thin section for energy spectrum (EDS) micro-area composition, measure the Al, Ti element content, and based on the measured Al, Ti element content, calculate the Al-Ti influence coefficient b.

[0092] Using the energy spectrum probe to analyze the different areas of the CL ring band in the same area to be analyzed in the rock thin section, the acceleration voltage used in the test is 20 kV, the quartz ring band energy spectrum data is obtained, and the Al, Ti element content data is measured. Based on the measured Al, Ti element content, the Al-Ti influence coefficient b is calculated according to the following formula:

[0093] b = Al 含量 / Ti 含量 ;

[0094] Wherein, Al 含量 is the Al content value of the quartz ring band energy spectrum data, wt%; Ti 含量 is the Ti content value of the quartz ring band energy spectrum data, %.

[0095] S24, adjust the sample table to switch the rock thin section tilt angle, and again use the backscattering electron probe to focus on the area to be measured in the rock thin section; after the aggregation is completed, the backscattering electron diffraction probe is used again to analyze the quartz particles in the measured area for EBSD crystal structure, and the lattice orientation difference influence coefficient c of the quartz particles is calculated.

[0096] During the test, the system software will record the position of the quartz particles. Specifically, in step 2.1, the system software has acquired and recorded the position data of all quartz particles in the measured area, and in the subsequent step 2.4, when switching to the backscattering electron probe, the positions of the corresponding quartz particles in the rock thin section can be found again, so that the area to be analyzed in the rock thin section during the analysis of steps S21 to S23 is determined, so that the position of the area to be analyzed remains consistent under different probe tests.

[0097] The sample stage is adjusted so that the thin section sample is inclined at 70°, and a KAM map of the thin section sample is obtained using a backscattered electron diffraction probe, and lattice orientation difference data of all quartz grains are obtained based on the KAM map. Based on the lattice orientation difference data of all quartz grains obtained by EBSD crystal structure analysis, the lattice orientation difference influence coefficient c of the quartz grains is calculated according to the following formula:

[0098] ;

[0099] wherein n is the number of all quartz grains; a max is the maximum lattice orientation difference in all quartz grains, °; a min is the minimum lattice orientation difference in all quartz grains, °; a i is the lattice orientation difference of the i-th quartz grain, °.

[0100] S3, data fusion and discrimination of the plurality of data indexes obtained in step S2: based on the CL ring width variation coefficient a, the Al-Ti influence coefficient b, the lattice orientation difference influence coefficient c, and the inclusion type relative proportion coefficient d obtained in step S2, it is determined whether the quartz sample is of hydrothermal origin or metamorphic origin.

[0101] Overall determination principle:

[0102] When N1≤N2, d=0; at this time, it can be directly determined to be of metamorphic origin.

[0103] When N1>N2, the quartz origin is comprehensively judged based on the values of a, b, c, and d according to the following identification model formula:

[0104] If a+b+c+d≥Q, it is determined to be of hydrothermal origin;

[0105] If a+b+c+d<Q, it is determined to be of metamorphic origin;

[0106] wherein Q is a threshold value of quartz of hydrothermal origin, i.e., a critical value of quartz of hydrothermal origin and metamorphic origin, and this critical value Q can be determined according to the measured values of a 实测 , b 实测 , c 实测 , and d 实测 of a plurality of quartz samples of known origin. Specifically, the values of a 实测 , b 实测 , c 实测 , and d 实测 of the quartz samples of known origin are summed to obtain a sum value Q 实测 of a plurality of quartz samples, and the sum value Q 实测 of a plurality of quartz samples of hydrothermal origin is compared with the sum value Q 实测The value Q is a critical value, and the data is divided into two groups, which are distributed in two value ranges. The critical value Q is a value or a small value range between the two value ranges. Even if the two value ranges have individual sample data Q 实测 There is data overlap, and the data can be removed to determine the critical value Q. It can be understood that the critical value Q in the embodiment is not an absolutely accurate value. The more the number of known genesis quartz samples, the more accurate the critical value Q. Therefore, the embodiment further includes the following steps: establishing a measured database of quartz samples of known hydrothermal genesis and metamorphic genesis, and continuously updating the measured a 实测 , b 实测 , c 实测 , d 实测 values of the known genesis quartz samples in the database, and adjusting the critical value Q according to the continuously updated measured a 实测 , b 实测 , c 实测 , d 实测 value data in the database.

[0107] For example, according to the laboratory statistics of a plurality of quartz samples of known genesis, the critical value Q is determined to be 7 according to the distribution range of the sum of the a 实测 , b 实测 , c 实测 , d 实测 values of the quartz samples of different genesis. Based on the determined critical value Q of 7, the method of the embodiment is used to identify five samples produced in Dalian, Liaoning, Xing'an League, Inner Mongolia, Yantai, Shandong, Qianzhongnan, Guizhou, and Wenshan, Yunnan. The N1 and N2 values of the five samples are (11 and 6), (8 and 5), (6 and 4), (9 and 7), and (2 and 5), respectively. According to the overall determination principle, only the quartz sample from Wenshan, Yunnan has N1=2<N2=5, so the quartz sample from Wenshan, Yunnan is directly determined to be of metamorphic genesis. Further, the sum of the a+b+c+d values of the quartz samples from the other four production places is 7.21, 7.06, 7.99, and 5.36, respectively. Since the critical value Q is 7, the sum of the a+b+c+d values of the quartz samples from Dalian, Liaoning, Xing'an League, Inner Mongolia, and Yantai, Shandong is greater than 7, so the three quartz samples are determined to be of hydrothermal genesis. The sum of the a+b+c+d values of the quartz sample from Qianzhongnan, Guizhou is less than 7, so the quartz sample is determined to be of metamorphic genesis.

[0108] Table 1 is a statistical table of the identification test results of the quartz samples using the identification method of the present application.

[0109]

[0110] Compared with the prior art, the quartz genesis identification method based on the fusion of the multi-modal signals of the scanning electron microscope provided by the embodiment can achieve the following beneficial effects:

[0111] 1. The identification method of the present invention uses only one scanning electron microscope equipped with an energy dispersive spectroscopy probe, a cathodic emission probe, and a backscattered electron diffraction probe to determine the origin of quartz, which significantly improves work efficiency. The total analysis time for a single sample is less than 2 hours, which is about 80% shorter than the total analysis time of the isotope method.

[0112] 2. By comprehensively employing multiple indicators such as the coefficient of variation of CL ring width (a), the influence coefficient of Al-Ti (b), the influence coefficient of lattice orientation difference (c), and the relative gravity coefficient of inclusion type (d), the proposed identification model formula can be directly substituted into the values ​​of multiple indicators to quickly obtain the identification results of quartz origin. This overcomes the problems of existing methods, such as reliance on manual macroscopic observation, high cost, inability to achieve non-destructive analysis of micro-areas, lack of standardized procedures, and poor accuracy of identification results due to the single identification indicator.

[0113] 3. Compared with traditional identification methods, the identification method of this invention significantly improves the accuracy of the identification results. Based on test results of 100 known quartz samples, the overall accuracy of the identification results obtained using the method of this invention reaches 92%, while the accuracy of these samples obtained using traditional petrographic methods (microthermometry, fluid inclusion analysis) is approximately 70%. Furthermore, it achieves non-destructive micro-area analysis, with the smallest analytical area reaching 5 μm × 5 μm, without damaging the sample, facilitating subsequent experiments. Moreover, it has a lower testing cost compared to isotope analysis methods.

[0114] Example 2

[0115] In step S24 of Example 1, when performing EBSD crystal structure analysis, it is necessary to adjust the tilt angle of the sample stage so that the rock thin section to be tested is tilted at a predetermined angle in the SEM to optimize the interaction between the electron beam and the detector. However, there is currently no substrate stage that can control the autonomous tilting of the sample. At the same time, for large geological thin sections that exceed the size of existing substrate stages, the center of gravity of the sample shifts significantly when tilted, which can easily lead to image drift during SEM imaging and affect the accuracy of data acquisition.

[0116] To address the aforementioned issues, another specific embodiment of the present invention discloses a sample stage, specifically an EBSD testing sample stage for geological thin sections, which can be applied to the scanning electron microscope in Example 1. This sample stage not only accommodates large-sized rock thin section samples but also avoids significant center-of-gravity shift when tilted, preventing image drift during SEM imaging and improving data acquisition accuracy.

[0117] like Figures 2 to 9 As shown, the sample stage includes a mounting base 11, a plug-in base 10, a rotating support arm 20, a drive mechanism, a substrate stage 30, and a center of gravity holding mechanism 40.

[0118] The mounting seat 11 is a supporting part of the test sample table, and the top surface of the mounting seat is provided with a socket; the lower part of the plug-in base 10 is inserted into the mounting seat 11; the bottom of the rotating arm 20 is hinged to the upper part of the plug-in base 10; the driving mechanism is drivingly connected with the rotating arm 20, and is used for driving the rotating arm 20 to rotate; the base plate table 30 is connected with the rotating arm 20, and the rotating arm 20 is connected in the center of the base plate table 30; the geological slice to be tested is fixedly installed on the base plate table 30; the gravity center maintaining mechanism 40 is arranged at the bottom of the base plate table 30, and is used for moving in association with the rotating arm 20 after the rotating arm 20 is inclined relative to the plug-in base 10, so that the gravity center of the rotating arm 20 and the base plate table 30 is maintained in the vertical direction of the plug-in base 10, that is, the gravity center of the rotating arm 20 and the base plate table 30 is located on or substantially located on the axis of the cylindrical plug-in base 10.

[0119] It should be noted that the gravity center of the rotating arm 20 and the base plate table 30 as a whole can be located on the axis of the cylindrical plug-in base 10, or can have a small deviation from the axis of the plug-in base 10, for example, after adjusting the gravity center, the vertical distance between the gravity center of the two as a whole and the axis of the plug-in base 10 is not more than 3 mm.

[0120] Compared with the prior art, the sample table of the present application takes the plug-in base 10 as a supporting part, and is hinged to the rotating arm 20, and the driving mechanism is drivingly connected with the rotating arm 20 to provide rotating power. The plug-in base 10 can be inserted into the mounting seat 11, the mounting seat 11 is a disc structure, and the top surface of the mounting seat 11 is provided with at least one socket, and the plug-in base 10 can be inserted into the socket. When the driving mechanism is actuated, the rotating arm 20 rotates around the hinge point, driving the centrally connected base plate table 30 to be inclined to a predetermined angle, and the inclination is 70°. At this time, the gravity center maintaining mechanism 40 moves in association with the rotating arm 20, so that the overall gravity center of the rotating arm 20 and the base plate table 30 is always maintained in the vertical direction of the plug-in base 10, preventing the gravity center from deviating when the large-size geological slice is inclined. By actively balancing the gravity center, the deviation of the gravity center of the large-size sample caused by inclination is avoided, the SEM imaging stability is ensured, and the data acquisition accuracy is improved. The integrated driving and gravity center adjusting functions can realize stable inclination without manual intervention, and simplify the operation process.

[0121] In the embodiment, the area of the base plate table 30 supporting the sample is >1cm²; preferably, the area of the base plate table 30 supporting the sample is a rectangular area, and the length and width of the rectangular area are both 4cm, so that two larger-size geological slices can be installed. By increasing the area of the base plate table 30 supporting the sample, the situation of testing larger-size geological slices (i.e. large-size samples) is met.

[0122] In some optional embodiments, the docking base 10 comprises a docking table 101 and a docking piece 102, the docking table 101 is hollow inside, and the docking piece 102 is a solid cylindrical rod. The driving mechanism comprises a linear driving motor 50 and a driving gear plate 51. The docking table 101 is installed at one end of the linear driving motor 50, the driving shaft of the linear driving motor 50 penetrates into the docking table 101, the docking piece 102 is installed at the other end of the linear driving motor 50, the driving gear plate 51 is connected with the driving shaft of the linear driving motor 50, a hinge shaft 52 is transversely inserted on the side of the docking table 101, the hinge shaft 52 is rotatable, the hinge shaft 52 is provided with a gear slot in the side wall inside the docking table 101, the driving gear plate 51 is engaged with the hinge shaft 52, and the rotating arm 20 is connected with the part of the hinge shaft 52 outside the docking table 101.

[0123] The docking table 101 of the docking base 10 is a hollow cylindrical structure, and the docking piece 102 is a solid cylindrical structure. The driving mechanism is composed of the linear driving motor 50 and the driving gear plate 51. The docking table 101 is installed at one end of the linear driving motor 50, the driving shaft penetrates into the docking table 101 to connect the driving gear plate 51; the docking piece 102 is installed at the other end of the linear driving motor 50, the docking piece 102 is fixedly connected with the motor shell of the linear driving motor 50, the docking piece 102 is used for connecting with the mounting seat 11 of the SEM, and the docking piece 102 is coaxially arranged with the docking table 101 and the driving shaft of the linear driving motor 50. In this way, the linear driving motor 50 body can be used as a support structure, so that multiple parts are integrated into one, which is beneficial to the control of the center of gravity. When the driving shaft of the linear driving motor 50 reciprocates, the driving gear plate 51 drives the hinge shaft 52 to rotate, and then drives the rotating arm 20 connected with the exposed part of the hinge shaft 52 to rotate, so as to realize the tilting action of the substrate table 30. The hollow docking table 101 provides installation space for the driving gear plate 51 and the hinge shaft 52, which is suitable for the limited installation environment inside the scanning electron microscope and avoids structural interference.

[0124] The docking piece 102 is used for docking to the mounting seat 11, and when the docking piece 102 is docked to the mounting seat 11, the end face of the linear driving motor 50 abuts against the end face of the mounting seat 11. After the docking piece 102 is inserted into the mounting seat 11, the end face of the linear driving motor 50 abuts against the end face of the mounting seat 11, and a rigid support is formed through mechanical cooperation to limit the micro displacement of the substrate table 30 caused by electron beam bombardment or mechanical vibration during SEM imaging. The abutment of the end faces eliminates the fitting gap in the installation process, ensures the positioning accuracy of the substrate table 30 during tilting movement, and further suppresses image drift. At the same time, better support and stability functions are provided for the substrate table 30.

[0125] In some alternative embodiments, the gravity center maintaining mechanism 40 comprises slide rails 401, a counterweight 402, and a counterweight driving mechanism; the slide rails 401 are connected to the bottom of the substrate table 30 and are symmetrically arranged with respect to the axis of the rotating arm 20; the counterweight 402 is slidingly connected to the slide rails 401; and the counterweight driving mechanism is arranged at the bottom of the substrate table 30 and is configured to drive the counterweight 402 to move to a predetermined position when the rotating arm 20 rotates to a first direction or a second direction opposite to the first direction, so that the center of the substrate table 30 and the counterweight 402 as a whole is maintained in the vertical direction of the docking base 10.

[0126] When the rotating arm 20 rotates to a first direction (e.g., left), the counterweight driving mechanism drives the counterweight 402 to move to a predetermined position in a second direction opposite to the first direction (e.g., right); and vice versa. By adjusting the position of the counterweight 402, the center of gravity of the substrate table 30 and the counterweight 402 as a whole is always maintained on the vertical axis of the docking base 10, thereby balancing the gravity center shift when the large-size sample is tilted. According to the tilt angle and direction of the rotating arm 20, the counterweight driving mechanism synchronously adjusts the position of the counterweight 402 to form a dynamic balance moment, thereby ensuring the stability of SEM imaging.

[0127] In one alternative embodiment, the length of the rotating arm 20 is set to 4 cm, the weight of the substrate table 30 and the sample is set to 50 g, the counterweight 402 moves 3 cm to the right when the rotating arm 20 rotates 20 degrees to the left from the vertical state, and the weight of the counterweight 402 is set to 22.8 g. The weight of the rotating arm 20 is ignored in the calculation, or the center of gravity of the rotating arm 20 is located at the hinge point, and in actual use, various additional structural weights and the like should be considered.

[0128] In one alternative embodiment, the slide rails 401 comprise a hanger 4011 and a meandering rail 4012, one end of the hanger 4011 is connected to the meandering rail 4012, the other end of the hanger 4011 is connected to the bottom of the substrate table 30, the counterweight 402 is provided with a sliding hole, the counterweight 402 is arranged on the lower transverse frame of the meandering rail 4012 and can slide relative to the transverse frame. The meandering rail 4012 is suspended from the bottom of the substrate table 30 through the hanger 4011, and the transverse frame provides a straight sliding path for the counterweight 402, and the movement direction of the counterweight 402 is consistent with the table top of the substrate table 30.

[0129] In one alternative embodiment, the counterweight driving mechanism comprises a synchronous belt 403, a pulley 404, a wheel frame, and a gear set, the pulley 404 is arranged at the outer side of both ends of the slide rails 401 and is rotatably connected to the wheel frame, the wheel frame is connected to the substrate table 30, the synchronous belt 403 is engagedly connected to the pulley 404, the gear set is drivingly connected to the synchronous belt 403, the hinge shaft 52 is engagedly connected to the gear set, and the synchronous belt 403 is connected to the counterweight 402.

[0130] The pulley 404 at the outer side of the both ends of the slide rail 401 is fixed to the base plate table 30 through a wheel bracket, and the synchronous belt 403 is engaged with the pulley 404 and connected with the counterweight 402. When the hinge shaft 52 rotates, the hinge shaft 52 drives the gear set to rotate, and the gear set drives the synchronous belt 403 to move after gear shifting, thereby driving the counterweight 402 to slide along the slide rail 401. The gear set changes the transmission ratio through gear engagement, so that the moving speed of the counterweight 402 matches the inclination angle of the rotating arm 20. For example, when the hinge shaft 52 rotates 20 degrees to the left, the synchronous belt 403 drives the counterweight 402 to move 3 cm to the right through the action of the gear set. When the counterweight 402 moves to this position, the center of gravity of the inclined base plate table 30 and the counterweight 402 as a whole remains in a vertical direction with the center of the base plate table 30 in the vertical state.

[0131] The angle change of the rotating arm 20 is converted into the position adjustment of the counterweight 402 in real time through the coupling transmission of the gear set and the synchronous belt 403, so that the dynamic synchronization of the center of gravity compensation is realized. When detection is performed, the angle of the rotation of the base plate table 30 is usually 20 degrees relative to the vertical direction. When the base plate table 30 needs to be rotated to different angles, the moving distance and the weight of the counterweight 402 need to be preset in advance to avoid the proportion relationship between the base plate table 30 and the moment not corresponding when the base plate table 30 is rotated to different angles.

[0132] In one of the alternative embodiments, the gear set includes a first gear 405, a second gear 406, a conversion shaft 407, a shaft sleeve 408, and a third gear 409. The first gear 405 is sleeved on the end of the hinge shaft 52 extending outside, and the rotating arm 20 is provided with a mounting hole 201. The third gear 409 is arranged in the mounting hole 201. The conversion shaft 407 is rotatably connected to the rotating arm 20. One end of the conversion shaft 407 penetrates into the mounting hole 201 and is connected with the third gear 409. The opposite end penetrates out of the rotating arm 20 and extends to a position above the first gear 405. The second gear 406 is engaged with the first gear 405. The shaft sleeve 408 is sleeved on the conversion shaft 407 and connected with the rotating arm 20. The synchronous belt 403 penetrates into the mounting hole 201 and is engaged with the third gear 409.

[0133] When the hinge shaft 52 rotates, the first gear 405 drives the second gear 406 to rotate, and the third gear 409 is driven to rotate through the conversion shaft 407, thereby driving the synchronous belt 403 engaged with the third gear 409 to move and pull the counterweight 402 to slide. The shaft sleeve 408 can strengthen the connection of the conversion shaft 407, so that the conversion shaft 407 rotates stably.

[0134] In one of the alternative embodiments, the first speed change wheel 405, the second speed change wheel 406, the conversion shaft 407, the shaft sleeve 408, and the third speed change wheel 409 can be made of nylon or engineering plastic, further reducing the weight of the device. A counterweight can be provided on the rotating arm 20 to balance the force of the second speed change wheel 406 on the rotating arm 20 in the lateral direction.

[0135] In one of the alternative embodiments, when the hinge shaft 52 rotates to the left, the first speed change wheel 405 is coaxial and in the same direction with the hinge shaft 52, so the first speed change wheel 405 rotates to the left. When the gears mesh, the adjacent gears rotate in opposite directions. The first speed change wheel 405 rotates to the left, pushing the second speed change wheel 406 to rotate to the right. The second speed change wheel 406 is coaxial with the third speed change wheel 409, and they rotate in the same direction, so the third speed change wheel 409 rotates in the same direction as the second speed change wheel 406. When the third speed change wheel 409 meshes with the synchronous belt 403, the direction of the gear rotation determines the direction of the synchronous belt 403 movement. When the third speed change wheel 409 rotates to the right, the upper synchronous belt 403 is driven to move to the right, and the lower synchronous belt 403 moves to the left. Therefore, the counterweight 402 connected to the upper synchronous belt 403 moves to the right.

[0136] In one of the alternative embodiments, a tooth number matching of the first speed change wheel 405, the second speed change wheel 406, and the third speed change wheel 409 is provided. The first speed change wheel 405 has 6 teeth, the second speed change wheel 406 has 33 teeth, and the third speed change wheel 409 has 33 teeth. The diameter of the first speed change wheel 405 is 0.54 cm, the diameter of the second speed change wheel 406 is 2.97 cm, and the diameter of the third speed change wheel 409 is 2.97 cm. After the above settings, the gears of the first speed change wheel 405, the second speed change wheel 406, and the third speed change wheel 409 are matched, so that when the hinge shaft 52 rotates to the left, the counterweight 402 is moved to the right through the combination of the synchronous belt 403 and the gears, completing the center of gravity balancing action of the substrate table 30. It can be understood that the above parameters can be adjusted according to actual conditions.

[0137] The third speed change wheel 409, the synchronous belt 403, the pulley 404, the slide rail 401 and the counterweight 402 are located in the rotation plane of the rotating arm 20. The third speed change wheel 409, the synchronous belt 403, the pulley 404, the slide rail 401 and the counterweight 402 are located in the rotation plane (i.e. the plane perpendicular to the axis of the hinge shaft 52) of the rotating arm 20. When the rotating arm 20 rotates around the hinge shaft 52, all the moving parts move in the same plane, the synchronous belt 403 moves along the slide rail 401, and the counterweight 402 slides along with the synchronous belt 403 in the rotation plane, ensuring that the force arm change of the gravity center adjustment and the inclination angle change are coupled in the same plane. The above arrangement eliminates the motion coupling error in three-dimensional space, so that the position adjustment of the counterweight 402 directly corresponds to the offset of the gravity center in the rotation plane, and the response speed of the balance control is improved.

[0138] In an alternative embodiment, the top of the rotating arm 20 and the connection part of the substrate table 30 are Y-shaped structures, and the slide rail 401, the counterweight 402 and the synchronous belt 403 are all arranged through the space of the Y-shaped structure of the top of the rotating arm 20.

[0139] In an alternative embodiment, two pushers 4031 are connected to the outer belt surface of the synchronous belt 403, and a through hole 4032 is further arranged on the counterweight 402. The synchronous belt 403 penetrates the through hole 4032, and the two pushers 4031 are arranged on the opposite sides of the through hole 4032 and tightly contact the counterweight 402. The through hole 4032 has a gap with the belt surface of the synchronous belt 403. The pushers 4031 are respectively located on the opposite sides of the through hole 4032 and tightly contact the counterweight 402. When the synchronous belt 403 moves, the pushers 4031 push the counterweight 402 to slide along the slide rail 401, and the gap allows the synchronous belt 403 to freely penetrate the through hole 4032, avoiding friction between the belt surface and the hole wall. At the same time, the direct connection between the synchronous belt 403 and the counterweight 402 is avoided, so that the weight of the counterweight 402 is shared, and the balance error is caused.

[0140] In an alternative embodiment, the substrate table 30 further comprises a clamping and fixing assembly for clamping and fixing the geological slice to be tested on the substrate table 30.

[0141] The number of clamping and fixing assemblies is two, and the two clamping and fixing assemblies can clamp and fix two geological slices. Preferably, each clamping and fixing assembly has four clamping and fixing points for the edge position of the geological slice, and the four clamping and fixing points are located at the four corners of a rectangle.

[0142] In one of the optional embodiments, the clamping and fixing assembly comprises a clamping rail 32, a sliding seat 33, a positioning member 34, an elastic pull rope 35 and a clamping claw 36; the tabletop of the base plate table 30 is further provided with a sliding groove 31, the sliding groove 31 is provided with the clamping rail 32, the clamping rail 32 is provided with two sliding seats 33, the sliding seats 33 can slide relative to the clamping rail 32, the clamping rail 32 is provided with the positioning member 34 at the middle position, the elastic pull rope 35 is provided between the positioning member 34 and the sliding seat 33, one end of the elastic pull rope 35 is connected to the positioning member 34, and the opposite end is connected to the sliding seat 33, the sliding seat 33 is hinged with the v-shaped clamping claw 36, the clamping claw 36 comprises a clamping side wing 361 and a connecting side wing 362, a spring is connected to the connecting side wing 362, and the spring is further connected to the sliding seat 33; the clamping side wing 361 is located on the tabletop of the base plate table 30, and the clamping side wing 361 can rotate about the connecting side wing 362 as the rotation axis.

[0143] When the geological slice is installed on the base plate table 30, the sliding seat 33 adjusts the position of the clamping claw 36, and the elastic pull rope 35 provides a pre-tightening force; after the geological slice is placed in place, the clamping claws 36 on the two sides of the geological slice press the geological slice, so that the geological slice is fixed, the clamping claw 36 presses the sample, the clamping side wing 361 can rotate through the connecting side wing 362 to adapt to geological slices of different thicknesses, and simultaneously press and fix the surface of the geological slice, so that the geological slice is attached to the base plate table 30. The cooperation of the elastic pull rope 35 and the spring enables the sliding seat 33 to automatically adjust the position according to the size of the geological slice, the clamping claw 36 uniformly applies clamping force, firmly fixes large-size geological slices, and avoids sample drift caused by the traditional gluing method.

[0144] For example, the number of clamping and fixing assemblies is two, the number of sliding grooves 31 is four, each geological slice corresponds to two sliding grooves 31 and four clamping claws 36, the sliding grooves 31 correspond to the side edge positions of the geological slice respectively, and the clamping claws 36 correspond to opposite ends of the geological slice, and two clamping claws 36 can be arranged at each end. The clamping claw 36, the clamping rail 32 and the sliding seat 33 are made of conductive metal, for example, copper.

[0145] In the EBSD test in Embodiment 1, the sample table is used to test the geological slice. In the test, the large-size geological slice to be tested is fixed on the base plate table 30, the driving mechanism is actuated, the rotating support arm 20 rotates about the hinge point, the centrally connected base plate table 30 is tilted to 70°, at this time, the gravity center maintaining mechanism 40 moves in association with the rotating support arm 20, so that the overall gravity center of the rotating support arm 20 and the base plate table 30 is always maintained in the vertical direction of the plug-in base 10, and the installation of the large-size geological slice is completed. Subsequently, the EBSD crystal structure analysis test is performed, and the test result is obtained.

[0146] Compared with the prior art, the sample table of the embodiment is suitable for the scanning electron microscope in embodiment 1, can not only realize the test on the large-size geological slice, but also prevent the gravity center from deviating when the large-size geological slice is tilted through the gravity center keeping mechanism, ensures the SEM imaging stability, improves the data acquisition accuracy, realizes the stable tilting without manual intervention, and simplifies the operation process. The above specific embodiments further specifically describe the purposes, technical solutions and beneficial effects of the application. It should be understood that the above description is only a specific embodiment of the application and is not used to limit the protection scope of the application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the application should be included in the protection scope of the application.

Claims

1. A method for identifying the origin of quartz based on scanning electron microscopy multimodal signal fusion, characterized in that, Including the following steps: S1. Preparation of thin sections of quartz rock samples: S2. Multimodal data were collected on the test area of ​​the rock thin section using a scanning electron microscope, and the following parameters were calculated: CL ring width variation coefficient a, Al-Ti influence coefficient b, lattice orientation difference influence coefficient c, and inclusion type relative gravity coefficient d. S3. Based on the CL ring width variation coefficient a, Al-Ti influence coefficient b, lattice orientation difference influence coefficient c, and inclusion type relative gravity coefficient d, determine whether the quartz sample is of hydrothermal origin or metamorphic origin.

2. The method for identifying the origin of quartz based on scanning electron microscopy multimodal signal fusion according to claim 1, characterized in that, Step S2 includes: S21. Using a backscattered electron probe, receive the backscattered signal of quartz in the area to be tested on the rock thin section to obtain the morphology and inclusion characteristics of all quartz grains in the area to be tested, and determine the type and quantity of inclusions in each quartz grain; based on the number of gas-liquid inclusions N1 and the number of metamorphic mineral inclusions N2 in all quartz grains in the area to be tested, calculate the relative gravity coefficient d of the inclusion type according to the following formula: When N1 > N2, then ; When N1≤N2, then d=0.

3. The method for identifying the origin of quartz based on scanning electron microscopy multimodal signal fusion according to claim 1, characterized in that, Step S2 also includes: S22. Using a cathodoluminescence probe, perform cathodoluminescence analysis on the same test area of ​​a rock thin section, measure the width of the CL annulus, and obtain the widest annulus W. max and the narrowest ring width W min The coefficient of variation a of the CL ring width is calculated according to the following formula: a=W max / W min ; Among them, W max The widest annular band W max ,um;W min The narrowest annular band width is um.

4. The method for identifying the origin of quartz based on scanning electron microscopy multimodal signal fusion according to claim 1, characterized in that, Step S2 also includes: S23. Using an energy dispersive spectroscopy (EDS) probe, perform energy dispersive spectroscopy (EDS) micro-area composition analysis on the same test area of ​​the rock thin section to determine the Al and Ti element contents; calculate the Al-Ti influence coefficient b according to the following formula: b=Al 含量 / Ti 含量 ; Among them, Al 含量 The values ​​represent the Al content (%) from the energy dispersive spectroscopy (EDS) data of quartz rings, and the Ti content (%). 含量 The Ti content value is represented by the energy dispersive spectroscopy (EDS) data of the quartz ring zone.

5. The method for identifying the origin of quartz based on scanning electron microscopy multimodal signal fusion according to claim 1, characterized in that, Step S2 also includes: S24. Adjust the sample stage to switch the tilt angle of the rock thin section, and use the backscattered electron probe to focus on the area to be tested in the rock thin section again; after the focus is completed, use the backscattered electron diffraction probe to perform EBSD crystal structure analysis on the quartz particles in the area to be tested, and calculate the lattice orientation difference influence coefficient c of the quartz particles according to the following formula: ； Where n is the total number of quartz particles; α max The maximum lattice orientation difference among all quartz grains is α, °; min The minimum lattice orientation difference among all quartz grains, °; α i Let be the lattice orientation difference of the i-th quartz grain, in °.

6. The method for identifying the origin of quartz based on scanning electron microscopy multimodal signal fusion according to claim 1, characterized in that, In step S3, the origin of the quartz sample is determined according to the following identification model formula: If a+b+c+d≥Q, it is determined to be of hydrothermal origin; If a+b+c+d<Q, it is determined to be of a metamorphic origin; Where Q is the critical value for quartz to be of hydrothermal and metamorphic origin.

7. The method for identifying the origin of quartz based on scanning electron microscopy multimodal signal fusion according to claim 6, characterized in that, It also includes the following steps: establishing a database of measured quartz samples of known hydrothermal and metamorphic origins, and continuously updating the database with measured data for quartz samples of known origins. 实测 b 实测 c 实测 d 实测 The value is then determined based on the continuously updated measured value of a in the database. 实测 b 实测 c 实测 d 实测 The critical value Q is adjusted based on the value data.

8. The method for identifying the origin of quartz based on scanning electron microscopy multimodal signal fusion according to claim 1, characterized in that, Step S1 includes: S11. Cut the collected quartz sample into cuboid sample blocks, and perform mechanical grinding and argon ion polishing on the cuboid sample blocks to make the surface smooth, and obtain rock thin sections with a size of 2cm×2cm. S12. Spray a 5-10 nm carbon film onto the rock thin sections in a vacuum coating machine to complete the preparation of the rock thin sections.

9. The method for identifying the origin of quartz based on scanning electron microscopy multimodal signal fusion according to claim 1, characterized in that, The scanning electron microscope is equipped with a backscattered electron probe, an energy dispersive spectroscopy probe, a cathode luminescence probe, and a backscattered electron diffraction probe.

10. The method for identifying the origin of quartz based on scanning electron microscopy multimodal signal fusion according to claim 9, characterized in that, The scanning electron microscope is also equipped with a sample stage.

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