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Method for judging formation time of fragmental rock based on structural thermal evolution history

A technology of clastic rock and thermal evolution, applied in the direction of material inspection, soil material testing, etc., can solve the problems that cannot represent the sedimentary age, is difficult to apply, and the paleontological fossils in the gravel are scarce.

Inactive Publication Date: 2010-05-05
XI'AN PETROLEUM UNIVERSITY
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] However, for clastic rocks with inconspicuous bedding and limited exposure, such as conglomerate, magnetic stratigraphic studies are difficult to carry out; conventional lithology, lithofacial comparison, contact relationship, and provenance age analysis are often limited due to conglomerate distribution, The top-bottom boundaries are too wide to be applied; the clastic age cannot represent the sedimentary age; although early authigenic cement minerals can represent the sedimentary age, it is difficult to obtain sufficient samples, and the isotope system of diagenetic dating minerals cannot be confirmed Whether it remained closed during the later thermal events; paleontological fossils in the gravel are scarce, the distribution of volcanic interlayers and cosmic dust is limited, and the sample volume is small and cannot be separated well; the dating method of Cenozoic cement is not suitable for Mesozoic clastic rocks
The above-mentioned methods for determining the depositional age of clastic rocks have certain defects, which makes the formation age of some clastic rocks, especially some conglomerates with limited distribution areas and lack of paleontological fossils, have been controversial, and it is still unresolved.

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  • Method for judging formation time of fragmental rock based on structural thermal evolution history
  • Method for judging formation time of fragmental rock based on structural thermal evolution history
  • Method for judging formation time of fragmental rock based on structural thermal evolution history

Examples

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Embodiment 1

[0025] Embodiment one, sample is Kongtong mountain conglomerate

[0026] A method for judging the formation age of clastic rocks based on tectonic thermal evolution history, comprising the following steps:

[0027] The first step is to conduct a fission track test on the sandstone interlayer sample in the Kongtong Mountain conglomerate, and obtain the fission track combination age (Pooled age) and error (AgeErr) of apatite and zircon in the sample, and the fission track median value Age (Central age) and error (Age Err), statistical test probability P(χ 2 )% and apatite fission track length (L (μm)) and length error, see Table 1, to obtain apatite single fission track length (L (μm)), apatite single fission The maximum diameter of the track etching image (Kin Par) and the angle between the single fission track direction of apatite and the crystallization C-axis (C-axis) are shown in Table 2, and the age of the apatite single particle (Age) and error (Age Err), apatite single...

Embodiment 2

[0040] Example 2, the sample is the clastic rock of Liupan Mountain in Longde

[0041] A method for judging the formation age of clastic rocks based on tectonic thermal evolution history, comprising the following steps:

[0042] The first step is to conduct a fission track test on the clastic rock samples from Liupanshan in Longde, and obtain the fission track combination age (Pooled age) and error (Age Err) of apatite and zircon in the sample, and the median value of the fission track Age (Central age) and error (Age Err), statistical test probability (P(χ 2 )%) and apatite fission track length (L (μm)) and length error, see Table 4, obtain apatite single fission track length (L (μm)), apatite single The maximum diameter (Kin Par) of the fission track etching image and the angle (C-axis) between the direction of the single fission track of apatite and the crystallization C axis (C-axis) are shown in Table 5, and the age (Age) and error (Age) of the apatite single particle ( ...

Embodiment 3

[0057] Embodiment three, the sample is carbon mountain clastic rock

[0058] A method for judging the formation age of clastic rocks based on tectonic thermal evolution history, comprising the following steps:

[0059] The first step is to conduct fission track test on the carbon mountain clastic rock sample, and obtain the fission track combination age (Pooled age) and error (±1σ) of apatite and zircon in the sample, and the fission track median age (Central age) and error (±1σ), statistical test probability P(χ 2 ) and apatite fission track length (L(μm)) and length error (±1σ) (Table 7), to obtain apatite single fission track length (L(μm)), apatite intersecting the polished surface The largest diameter (Kin Par) of the single fission track etching image of apatite and the angle between the direction of a single fission track of apatite and the crystallization C axis (C-axis) (Table 8), and the age of apatite single particle (Age) and Error (±1σ), apatite single particle ...

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Abstract

The invention provides a method for judging the formation time of fragmental rock based on structural thermal evolution history, which comprises the steps of: firstly, testing a fragmental rock sample by means of fission track to obtain the date of apatite and zircon in the sample; ensuring an analog thermal history route search time region and selecting an analog annealing mode according to the statistics detection probability P (*2) of apatite and zircon; respectively inputting the apatite data, the thermal history route search maximum time region and the annealing mode into thermal history analog software; setting each boundary point in the thermal history route search time region according to the tested track age of the apatite and the zircon and a region construction thermal event; selecting a monte carlo hermal history analog numerical value method; selecting 10000 analog thermal history routes; repeating the analog for 5-8 times; selecting an optimal thermal history route with larger detection values such as GOF and K-S; and analyzing the selected thermal history route to judge the formation time of the sample. The method has low use requirement and wide use range.

Description

technical field [0001] The invention relates to the field of determining the formation age of clastic rocks, in particular to a method for determining the formation age of clastic rocks based on the structural thermal evolution history. technical background [0002] Determination of the age of clastic rock deposition is the key to discussing its formation and evolution, correct stratigraphic correlation, scientific understanding of regional tectonic evolution and regional resource evaluation. At present, people mostly start from the comparison of lithofacies and environment of clastic rocks, the comparison of clastic structures and components, the comparison of rock geochemical characteristics, the age of clastic provenance, the age of top and bottom strata, paleontological fossils and assemblages, isotope dating of volcanic rock interlayers, Cosmic dust dating, dating of authigenic rock minerals in cement, paleomagnetic dating of phase-change sandstones in the same period, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/24
Inventor 宋立军赵靖舟吴少波
Owner XI'AN PETROLEUM UNIVERSITY
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