A method for determining the formation age of gypsum minerals
A gypsum and mineral technology, applied in the field of Quaternary chronology, can solve the problems of low U content, low U and Th isotope content, low solubility, etc., and achieve the effects of high accuracy, short detection time, and efficient dissolution
Active Publication Date: 2022-05-13
CHINA UNIV OF GEOSCIENCES (WUHAN)
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Problems solved by technology
On the one hand, the U content in gypsum minerals is low, and on the other hand, the solubility of gypsum in nitric acid and water is also very low, resulting in low U and Th isotope contents in the solution obtained by chemical separation, which brings great challenges to the uranium-series dating of gypsum minerals. challenge
It can be seen that a sufficient amount of gypsum samples cannot be dissolved by the general method of acid hydrolysis of carbonate rocks, which will have a great impact on the subsequent separation and testing of U and Th, and the accurate mineral formation age cannot be obtained.
[0005] At present, there are few dating methods available for gypsum minerals, and uranium-series dating of gypsum minerals is difficult because of their low solubility and low U content.
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Embodiment 1
[0031] Please refer to figure 1 , Embodiment 1 of the present invention provides a kind of method for determining the formation age of gypsum minerals, comprising the following steps:
[0032] Step S101, sample selection: select late Cenozoic gypsum samples (marked as S1, S2) and anhydrite samples (marked as S3, S4) on the western edge of the Qaidam Basin as research objects, and two gypsum samples and two anhydrite samples After the sample was evaporated to dryness at 60°C, 3g of the gypsum sample and anhydrite sample to be tested were ground into 30-mesh powder, and the 2 After blowing off the dust that may be on the surface, select a pure mineral powder sample under a binocular microscope, weighing about 180mg;
[0033] Step S102, add diluent: take four 25mL polyethylene beakers, add 15mg to the polyethylene beakers respectively 229 Th- 233 U isotope diluent, and then evaporated to dryness at 60°C on a hot table;
[0034] Step S103, sample dissolution: Add 23 mL of doub...
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The invention belongs to the technical field of Quaternary chronology, and specifically provides a method for determining the formation age of gypsum minerals, which mainly includes sample selection, addition of diluent, sample dissolution, solution coprecipitation, U and Th chemical separation, U and Th isotope Steps such as ratio determination, calculation of U-Th age, etc. The method for dating gypsum minerals provided by the invention has the advantages of high accuracy and short detection time, and can quickly, simply and efficiently dissolve large doses of gypsum minerals.
Description
technical field [0001] The invention relates to the technical field of Quaternary chronology, in particular to a method for determining the formation age of gypsum minerals. Background technique [0002] Gypsum minerals mainly include gypsum (CaSO 4 2H 2 O), anhydrite (CaSO 4 ) and other deposition products produced in evaporative environments. Gypsum minerals are an important object in the study of paleoclimate and paleoenvironmental evolution, formed in isolated oceans, lagoons, salt lakes and other environments. Gypsum is an important industrial raw material and building material with huge economic value. Gypsum minerals are widely developed in western China. Large-scale inland salt lakes have developed in the Qaidam Basin and Qinghai Lake area in the northern Qinghai-Tibet Plateau, depositing huge thick late Cenozoic gypsum products. For example, in the Chaerhan Salt Lake area in western Qinghai, the thickness of late Cenozoic sediments can reach 5300 meters. [00...
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IPC IPC(8): G01N27/626
CPCG01N27/62
Inventor 刘恩涛赵建新吕晓霞
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)