广西苗儿山铀矿田张家铀矿床成矿时代:沥青铀矿微区原位测定

郭春影; 秦明宽; 徐浩; 任忠宝; 邹明亮; 白芸; 赵宇霆

doi:10.3799/dqkx.2018.227

Volume 45 Issue 1

Jan. 2020

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Guo Chunying, Qin Mingkuan, Xu Hao, Ren Zhongbao, Zou Mingliang, Bai Yun, Zhao Yuting, 2020. Age of Zhangjia Uranium Deposit in the Miaoershan Ore Field, Guangxi Autonomous Region, China: In Situ Micro-Determination on Pitchblende. Earth Science, 45(1): 72-89. doi: 10.3799/dqkx.2018.227

Citation:

Guo Chunying, Qin Mingkuan, Xu Hao, Ren Zhongbao, Zou Mingliang, Bai Yun, Zhao Yuting, 2020. Age of Zhangjia Uranium Deposit in the Miaoershan Ore Field, Guangxi Autonomous Region, China: In Situ Micro-Determination on Pitchblende. Earth Science, 45(1): 72-89. doi: 10.3799/dqkx.2018.227

Citation:

Guo Chunying, Qin Mingkuan, Xu Hao, Ren Zhongbao, Zou Mingliang, Bai Yun, Zhao Yuting, 2020. Age of Zhangjia Uranium Deposit in the Miaoershan Ore Field, Guangxi Autonomous Region, China: In Situ Micro-Determination on Pitchblende. Earth Science, 45(1): 72-89. doi: 10.3799/dqkx.2018.227

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Age of Zhangjia Uranium Deposit in the Miaoershan Ore Field, Guangxi Autonomous Region, China: In Situ Micro-Determination on Pitchblende

doi: 10.3799/dqkx.2018.227

1.
CNNC Beijing Research Institute of Uranium Geology, Beijing 100029, China
2.
CNNC Key Laboratory of Uranium Resource Exploration and Evaluation Technology, Beijing 100029, China
3.
China National Uranium Co. Ltd., Beijing 100013, China
4.
Changsha Uranium Geology Research Institute, CNNC, Changsha 410007, China
5.
School of Earth Sciences and Mineral Resources, China University of Geosciences, Beijing 100083, China

Received Date: 2018-06-29
Publish Date: 2020-01-15

Abstract

Abstract

The Zhangjia uranium deposit is one of the representative uranium deposits in the northern Miaoershan uranium orefield. The detailed study of metallogenic ages of the Zhangjia uranium deposit is very important not only to understanding the regularity of uranium mineralization at regional scale of the Miaoershan uranium orefield but also to systematically investigating the tectonic setting and geodynamics of hydrothermal uranium deposits in granitoids in Southern China. Based on detailed microscopic observation,the vein pitchblende was studied by in-situ electron microprobe U-Th-Pb and LA-ICP-MS U-Pb isotopic and rare earth element analysis. Twenty spots electron probe micro-analysis (EPMA) show calculated U-Th-Pb chemical ages ranging from 55.3 Ma to 81.1 Ma. 19 of the 20 ages give a weighted average age at 71.4±1.9 Ma. Based on rare earth elements differences,34 spots LA-ICP-MS U-Pb isotopic ages can be classified into two groups. The 13 U-Pb isotopic data of the first group 15 data give a weighted ²⁰⁶Pb/²³⁸U average age at 69.4±4.9 Ma. The second group includes 19 data spots,16 of which give a weighted ²⁰⁶Pb/²³⁸U average age at 94.1±3.0 Ma. The weighted EPMA U-Th-Pb chemical age 71.4±1.9 Ma is identical to the weighted ²⁰⁶Pb/²³⁸U average age 69.4±4.9 Ma of first group 13 data spots calculated by LA-ICP-MS U-Pb isotopic method. Thus we believe that the Zhangjia uranium deposit was formed at some 70 Ma. The weighted ²⁰⁶Pb/²³⁸U average age 94.1±3.0 Ma of the second group of the LA-ICP-MS U-Pb isotopic data is believed to have no geological significance and was possibly affected by post-formation alteration and/or impurities minerals in the laser ablation process. In late Mesozoic era,the paleo-Pacific plate was subducted to the eastern Eurasia continent,which affected the tectonics,magmatism and metallogenisis of the South China block. The hydrothermal uranium deposits in grantoids of South China,including the Zhangjia uranium deposit,were mostly formed in 50 Ma to 80 Ma which corresponds to the oblique subduction of the paleo-Pacific Plate to the eastern Eurasia Continent.
- South China,
- hydrothermal uranium deposits,
- EPMA U-Th-Pb chemical age,
- LA-ICP-MS U-Pb dating,
- geodynamic background,
- geochronology

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