Method for effectively acquiring thorium-lead isotopic age of thorium deposit

Abstract

The invention belongs to the field of nuclear geology, and particularly relates to a method for effectively acquiring thorium-lead isotopic age of a thorium deposit. The method specifically comprisesthe following steps of: step 1, finding out geological characteristics of a uranium-thorium deposit, and collecting thorium mineralized samples of different mineralization types; 2, collecting thorium-rich ore samples of the uranium-thorium mineralized thorium-rich ore samples of different mineralization types in the step 1, and carrying out light sheet manufacturing on the thorium-rich ore samples; 3, carrying out rock-mineral identification on the thorium-rich mineral sample light sheet obtained in the step 2, and acquiring a thorium-rich mineral sample back scattering electron image; 4, andacquiring the thorium-lead isotopic age information of the uranium-thorium deposit according to the thorium-rich mineral electronic probe back scattering electron image in the step 3. According to the method, the Th-Pb isotopic age of thorium minerals and thorium-rich minerals can be provided, and the most direct and precise test data is provided for thorium mineralization chronology research.

Description

technical field [0001] The invention belongs to the field of nuclear geology, and in particular relates to a method for effectively obtaining thorium-lead isotope ages of thorium deposits. Background technique [0002] The metallogenic geological age of ore deposits is one of the key issues in the study of ore deposit geology. In recent years, more and more attention has been paid to the development of thorium resources, and the age of thorium minerals is one of the bases for the study of the metallogenic mechanism of thorium deposits. The traditional isotope dating is obtained through the U-Pb isotope system, but the minerals in thorium deposits are rich in thorium, and most of the thorium deposits are caused by hydrothermal activities. The traditional isotope dating system (Ru-Sr, U- The age obtained by Pb) cannot accurately represent the age of thorium mineralization, so Th-Pb isotopic dating of thorium-rich minerals is an effective technical method to obtain accurate th...

AI Technical Summary

Problems solved by technology

The traditional isotope dating is obtained through the U-Pb isotope system, but the minerals in the thorium deposits are mostly rich in thorium, and the genesis of most thorium deposits is mostly related to hydrothermal activities. The traditional isotope dating system (Ru-Sr, U- The age obtained by Pb) cannot accurately represent the age of thorium mineralization, so Th-Pb isotope dating of thorium-rich minerals is an effective technical method to obtain accurate thorium mineralization age

[0003] At present, there is no separate thorium deposit in my country, and thorium is often associated with uranium and rare earths

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