|Table of Contents|

EPMA Chemical Age of Pitchblende and Its Geological Significance in Xianshi Uranium Deposit of Xiazhuang Ore Field, the Northern Guangdong, China(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2021年第05期
Page:
814-828
Research Field:
基础地质与矿产地质
Publishing date:

Info

Title:
EPMA Chemical Age of Pitchblende and Its Geological Significance in Xianshi Uranium Deposit of Xiazhuang Ore Field, the Northern Guangdong, China
Author(s):
PEI Liu-ning1; 2;  GUO Chun-ying1; 2*;  ZOU Ming-liang3
(1. Beijing Research Institute of Uranium Geology, Beijing 100029, China; 2. CNNC Key Laboratory of Uranium Resources Exploration and Evaluation Technology, Beijing 100029, China; 3. Changsha Uranium Geology Research Institute, CNNC, Changsha 410007, Hunan, China)
Keywords:
granite-hosted uranium deposit;  intersection-located uranium deposit;  pitchblende;  EPMA U-Th-totalPb chemical dating;  geodynamic setting;  paleo-Pacific subduction;  Xiazhuang ore field;  Guangdong
PACS:
P619.14; P597
DOI:
10.19814/j.jese.2021.03008
Abstract:
The multi-stage uranium mineralization since Late Mesozoic is broadly corresponding to lithosphere extensional events in South China. The high precision dating on uranium mineralization is helpful for understanding the relationship between uranium mineralization and lithosphere extension. Xiazhuang ore field, one of the representative uranium ore fields in South China, is characterized by hydrothermal uranium deposits located at the intersections of fault and mafic dikes. Xianshi uranium deposit, a typical intersection-located uranium deposit in Xiazhuang ore field, is selected as the research object. Based on detailed petrographic observation by optical microscope and scanning electron microscopy(SEM), the U-Th-totalPb chemical ages are calculated based on oxide compositions of pitchblende determined by electron probe micro-analysis(EPMA). The results shows that uranium mineralization in Xianshi uranium deposit is associated with carbonate veins, and can be divided into earlier brecciaous and later veinlet pitchblende; the pitchblende is mainly composed of UO2, PbO, CaO, SiO2, Na2O and Al2O3. Moreover, the correlation coefficients of contents between SiO2 and PbO, Na2O and PbO, Na2O and Al2O3, Na2O and CaO, PbO and Al2O3, PbO and CaO, and Al2O3 and CaO are all less than 0.5, indicating no significant alteration of pitchblende after its formation, which is a prerequisite for calculating U-Th-totalPb chemical age of pitchblende. The calculated U-Th-totalPb chemical ages of pitchblende are divided into two groups with weighted mean values of(123.3±4.5)and(84.1±3.2)Ma, corresponding to earlier brecciaous and later veinlet pitchblende, respectively. Combined with previous published ages of Xianshi uranium deposit, the multi-stage uranium mineralization in Xianshi uranium deposit is identical to regional lithospheric extension events in South China. The uranium mineralization events in Xiazhuang ore field and even across South China may be related to the subduction of paleo-Pacific plate to the eastern China block.

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