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Fluid inclusion gas-liquid ratio and sub-mineral determination method

A technology of fluid inclusions and determination method, which is applied in the field of fluid inclusion analysis, can solve the problems of falling off of sub-minerals, difficult to identify, and difficult to accurately obtain gas-liquid ratio, etc., and achieves the effect of good application prospects.

Pending Publication Date: 2021-08-13
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has the following problems: (1) It is difficult to quantitatively analyze the composition of fluid inclusions
Since the inclusions are mainly irregular elliptical shapes of 1-10 microns, the laser ablation method obtains mixed composition information containing host minerals and fluid inclusions, and cannot accurately analyze the composition of a single inclusion or a single sub-mineral composition
At the same time, at room temperature, the high-energy laser opening the inclusions will cause the gas phase and liquid phase components in the fluid inclusions to disperse and daughter minerals to fall off, making it difficult to obtain accurate test results
High-energy laser melts tiny fluid inclusions, which cannot measure fluid inclusion volume and gas-liquid ratio
[0005] Patent document CN103940804A discloses a method for measuring the gas-liquid ratio of fluid inclusions by laser Raman mapping. This method uses a laser Raman automatic sample table to scan inclusions layer by layer and perform three-dimensional reconstruction to realize fluid inclusion component testing, volume, gas The estimation of the liquid ratio has the following problems: (1) Laser Raman surface scanning (mapping) technology is difficult to accurately obtain the gas-liquid ratio
However, it is difficult for this technology to accurately distinguish the gas phase and liquid phase boundaries, and it is also difficult to accurately obtain the gas-liquid ratio.
(2) Laser Raman surface scanning (mapping) technology is difficult to quantitatively analyze mineral components and identify complex sub-mineral components
The method of measuring fluid inclusions by laser Raman surface scanning (mapping) is limited by the size of inclusions, the size of daughter minerals, the shape of inclusions, the depth of inclusions buried in host minerals, the transparency of host minerals, and the fluorescence effect of host minerals. influence, it is difficult to measure inclusion daughter mineral composition
[0006] The patent document CN105486890A adopts the combination of scanning electron microscope + cryotransfer equipment + energy spectrometer, which effectively solves the problem of the loss of fluid and daughter minerals in fluid inclusions when the scanning electron microscope + energy spectrometer tests fluid inclusions, but there are the following deficiencies: (1 ) This method can only scan and analyze the inclusions that have been exposed on the surface of the sample and their internal daughter minerals, but the inclusions sealed below the sample surface cannot be scanned due to the limitation of the method; (2) When analyzing the composition of daughter minerals, use The method of raising the temperature to sublimate the fluid, but this may cause the daughter minerals to be lost at the same time, making it impossible to analyze; (3) This method can only measure the liquid phase, gas phase composition and daughter mineral composition in the frozen state, but not the fluid Volume of inclusions and gas-liquid ratio

Method used

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Experimental program
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Effect test

Embodiment

[0033] The samples for this experiment were collected from a drill hole in a copper mining area in Tibet, and they are fresh and unweathered copper ore samples in the hydrothermal mineralization stage. The specific implementation steps are as follows:

[0034] Step 1: Rock sample preparation

[0035]The two sides of the fluid inclusions of the rock samples were polished and lightly sliced ​​to make inclusion sheets with a size of 40mm*20mm and a thickness of 0.1-0.3mm.

[0036] Step 2: Observing fluid inclusions under an optical microscope

[0037] Observe the flakes under a microscope to find individual fluid inclusions as close as possible to the sample surface and mark their location with a black oil marker.

[0038] Step 3: Initial preparation of fluid inclusion samples

[0039] Using an ordinary cutting machine, cut the sample into samples with a size of 0.5*0.5mm and a thickness of 0.03mm, and stick them directly on a copper disc with a diameter of 3mm. The surface o...

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Abstract

The invention discloses a fluid inclusion gas-liquid ratio and sub-mineral determination method, and belongs to the technical field of fluid inclusion analysis. The determination method comprises the following steps: freezing the fluid inclusion into a solid state under a freezing condition, cutting the fluid inclusion layer by layer by adopting an argon ion grinding and polishing technology, scanning the section of the inclusion by utilizing a freezing scanning electron microscope, and calculating the gas-liquid ratio by adopting a three-dimensional modeling technology according to scanning graphs of the sections of the fluid inclusion with different depths. According to the invention, the inclusion volume, the liquid phase volume, the solid phase volume and the gas-liquid ratio can be accurately obtained, meanwhile, quantitative analysis is carried out on different phase states such as fluid inclusion sub-minerals, and the method has good application prospects.

Description

technical field [0001] The invention relates to the technical field of fluid inclusion analysis, in particular to a method for measuring the gas-liquid ratio of fluid inclusions and daughter minerals. Background technique [0002] Fluid inclusions are the original geological fluids that were trapped and sealed in mineral crystal defects during the crystallization growth of minerals in hydrothermal systems in geological history, and often contain gas, liquid and solid daughter minerals inside. The volume of fluid inclusions is extremely small, generally an oval cavity with a diameter of 1-10 microns, and a small amount of 20 microns or even larger, and the diameter of daughter minerals in fluid inclusions is generally 1-3 microns. Despite their small size, fluid inclusions preserve the fluid geochemical information of the geological environment at that time, such as temperature, pressure, composition, etc. Parameters such as fluid inclusion volume and gas-liquid ratio (the r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/04G01N23/20G01N23/20008G01N1/28G01N1/32G01N1/42
CPCG01N23/04G01N23/20G01N23/20008G01N1/42G01N1/286G01N1/32
Inventor 张刚阳单宝玺郑有业高顺宝吴松王达
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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