Method for measuring geologic age on basis of thermoanalysis

A thermal analysis and geological technology, applied in soil material testing, special data processing applications, instruments, etc., can solve the problem of undetermined geological age and so on

Inactive Publication Date: 2015-07-01
XIJING UNIV
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Problems solved by technology

There is currently no method for determining geological age based on thermal analysis

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  • Method for measuring geologic age on basis of thermoanalysis
  • Method for measuring geologic age on basis of thermoanalysis
  • Method for measuring geologic age on basis of thermoanalysis

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[0031] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0032] A method for determining geological age based on thermal analysis, comprising the steps of:

[0033] 1) Selection and preparation of reference samples:

[0034] 1.1) The apatite collected from Ma'anshan, Anhui Province was used as the sample to be tested, and the international standard geological sample Durango apatite, which is the same type of mineral as the sample to be tested, was selected as the reference sample;

[0035] 1.2) measure the reference sample Durango apatite 238 U, 232 Th and 147 S m The average value of isotope content is 13.612μg / g, 265.555μg / g and 30.99μg / g, which can be calculated N 238 U = 3.443025 × 10 16 n / g , ...

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Abstract

The invention discloses a method for measuring a geologic age on the basis of a thermoanalysis. The method comprises the following steps: selecting a reference sample, measuring the average values of <238>U, <232>Th and <147>Sm isotopic contents of the reference sample, calculating the values of N238, N235, N232 and N147<S>, calculating the standard N4<He> of the reference sample, making the isothermal DSC curve of the reference sample by a differential scanning calorimeter, measuring the annealing quality in a unit mass, calculating the annealing heat released by an average of alpha-ion nuclear tracks of the reference sample, then measuring the contents of uranium, thorium and samarium in a sample to be measured, calculating N235, N232 and N147<S>, making the isothermal DSC curve of the sample to be measured by using the differential scanning calorimeter, measuring the annealing heat, calculating the number of the nuclear tracks of the sample to be measured in the unit mass, and finally calculating the geologic age t of the sample to be measured, wherein the geologic environments experienced by the sample to be measured and the reference sample are similar. According to the method disclosed by the invention, a helium measurement is replaced by a heat measurement, and the method is simple and practical.

Description

technical field [0001] The invention belongs to the technical field of geological dating, and in particular relates to a method for measuring geological dating based on thermal analysis. Background technique [0002] Apatite (U-Th) / He isotope dating technology is a rapidly developed dating technology in recent years. At present, this method has been widely used in the study of denudation of the shallow crust, the dating study of near-surface materials and the study of geothermal history in the low-temperature section. One of the most important tasks in this dating method is to accurately determine the 238 U 232 Th, 147 Sm and 4 He isotope content, determined by neutron activation analysis 238 U 232 Th, 147 Sm isotope content is one of the more mature methods, while helium isotope is a gas, and its measurement is more difficult. Therefore, how to accurately determine the mineral 4 The content of He isotope becomes the key to (U-Th) / He isotope dating technique. Some ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/24G06F19/00
Inventor 杨铜锁史永谦李义国王永仓张建祥李险峰
Owner XIJING UNIV
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