Method for tracing hydrothermal fluid activity in basin sandstone-type uranium ore area

Abstract

The invention belongs to the technical field of uranium ore, and specifically relates to a method for tracing hydrothermal fluid activity in a sandstone-type uranium ore area. The method comprises thefollowing steps: step one, collecting research data to determine whether volcanic rocks are developed in and around sandstone-type uranium deposits in the basin; step two, collecting sandstone samples of an ore-bearing target layer in the sandstone-type uranium ore area, wherein the sandstone samples comprise rich ore samples and non-ore samples; step three, manufacturing polished thin sections and fluid inclusion sheets of rich ore samples; manufacturing the ore-free samples, and selecting heavy mineral apatite; step four, carrying out rock and mineral identification on the polished thin sections, and finding out hydrothermal alteration minerals and combination types thereof and hydrothermal alteration minerals related to uranium minerals; step five, completing fluid inclusion temperature measurement work, and comprehensively analyzing uniform temperature data; step six, inverting the thermal evolution history of the ore-bearing layer in the sandstone-type uranium ore area through anapatite fission track in the third step; and step seven, carrying out comprehensive analysis on the step one to the step six, and judging whether the sandstone uranium deposits in the basin undergo thermal fluid activity transformation or not.

Description

technical field [0001] The invention belongs to the technical field of uranium ore, and in particular relates to a method for tracing thermal fluid activity in a sandstone type uranium ore area. Background technique [0002] Since my country introduced the metallogenic theory of the typical interlayer oxidation zone in the United States and the former Soviet Union's aqueous uranium deposit metallogenic theory in the 1980s, successively in the Yili Basin, the Ordos Basin, the Turpan-Hami Basin, the Erlian Basin, the Songliao Basin, and the Tarim Basin A large number of large, medium and even extra-large sandstone-type uranium deposits have been discovered in many basins such as Bayin Gobi, making my country's proven sandstone-type uranium deposits and predicted resources ranked third among the four major uranium deposits. jumped to the first place. At the same time, in the process of exploration and research of sandstone-type uranium deposits, a large number of uranium geologi...

AI Technical Summary

Problems solved by technology

At the same time, in the process of exploration and research of sandstone-type uranium deposits, a large number of uranium geologists have found that rock-type uranium deposits in the central and eastern parts of China (Ordos Basin, Erlian Basin, Bayingobi Basin, and Songliao Basin) are different from typical uranium deposits. Compared with sandstone-type uranium deposits in the interlayer oxidation zone, uranium deposits have significant differences in oxidation zoning, element geochemical zoning, alteration mineral assemblage characteristics, uranium mineral types, etc., showing the characteristics of thermal fluid reformation, but for There is a lack of systematic research on the geological response of sandstone in sandstone-type uranium deposits to thermal fluid activity, and there is also a lack of tracer technology to determine whether there is thermal fluid activity in ore-bearing layers.

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