Definition method for forming time of ductile shear zone

A shear band and toughness technology, which is used in measuring devices, instruments, and analysis by electron paramagnetic resonance, can solve the problems of high cost and long test period, and achieve the effect of low test cost and low test cost.

Inactive Publication Date: 2014-02-12
HEFEI UNIV OF TECH
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[0007] The purpose of the present invention is to provide a simple and accurate method for defining the for...

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  • Definition method for forming time of ductile shear zone
  • Definition method for forming time of ductile shear zone

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Embodiment Construction

[0042] The present invention will be further described below in conjunction with the embodiments and accompanying drawings. But not as a limitation to the content of the present invention.

[0043] figure 1 It is a schematic flowchart of an embodiment of the method for determining the formation age of the ductile shear zone in the present invention. As shown in the figure, the method for determining the formation age of the ductile shear zone includes the following steps:

[0044] (1) Selection and collection of samples:

[0045] In this embodiment, the quartz veins and their surrounding rocks are collected from quartz-containing felsic mylonite.

[0046] Before sample collection, it is necessary to conduct preliminary selection and sectioning, observe the deformation state of the quartz under a microscope, and analyze which quartz is the newborn α-quartz formed by ductile shearing, and is not affected by the later tectonic activities. Determine the location of the selecte...

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Abstract

The invention relates to a definition method for the forming time of a ductile shear zone and in particular relates to a definition method for measuring the age of new alpha quartz in a mylonite substrate by an electron spin resonance method to define the forming time of the ductile shear zone. The method comprises the steps of (1) sample collection; (2) sample preparation; (3) sample measurement: measuring a balance uranium mole value and thermal activation ESR (electron spin resonance) spectrum amplitude; (4) calculating the forming time of the ductile shear zone. The method disclosed by the invention is simple and effective and has the advantages that test samples are readily available, the test cost is low and the like; the problems of long test period, high test cost and the like of the conventional definition method can be solved.

Description

technical field [0001] The invention relates to the field of determination of mineral age, in particular to a method for determining the age of new-born α-quartz in mylonite matrix. Background technique [0002] The ductile shear zone is a very common fault zone in geological structures, and it is an important window to see the deformation characteristics of rocks in deep structural layers. In recent years, with the deepening of its research, especially through the in-depth study of ductile shear zone geometry, kinematics, dynamics and rheological properties, the importance of ductile shear zone in the study of orogenic belts and its rheology The importance of geosciences is increasing day by day. Therefore, the age definition of ductile shearing is more and more important. [0003] The most commonly used method for defining ductile shear ages is muscovite 40 Ar- 39 Ar dating and SHRIMP zircon U-Pb dating. [0004] 40 Ar- 39 Ar method age determination is based on the...

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Application Information

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IPC IPC(8): G01N33/00G01N24/10
Inventor 任升莲李加好张妍黄鹏胡达刘国厅杨帆王薇
Owner HEFEI UNIV OF TECH
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