In situ LA-ICP-MS U-Pb Dating of Uraninite from the Shijiaowei Granite-type Uranium Deposit, Northern Guangdong Province

ZHANG Wei-meng; YAN Jie; ZHONG Fu-jun; PAN Jia-yong; LIU Wen-quan; LAI Jing; ZHOU Tang-bo

doi:10.15898/j.cnki.11-2131/td.201901160007

Yankuang ceshi (Jul 2019)

In situ LA-ICP-MS U-Pb Dating of Uraninite from the Shijiaowei Granite-type Uranium Deposit, Northern Guangdong Province

ZHANG Wei-meng,
YAN Jie,
ZHONG Fu-jun,
PAN Jia-yong,
LIU Wen-quan,
LAI Jing,
ZHOU Tang-bo

Affiliations

ZHANG Wei-meng: State Key Laboratary of Nuclear Resource and Environment, East China University of Technology, Nanchang 330013, China
YAN Jie: State Key Laboratary of Nuclear Resource and Environment, East China University of Technology, Nanchang 330013, China
ZHONG Fu-jun: State Key Laboratary of Nuclear Resource and Environment, East China University of Technology, Nanchang 330013, China
PAN Jia-yong: State Key Laboratary of Nuclear Resource and Environment, East China University of Technology, Nanchang 330013, China
LIU Wen-quan: State Key Laboratary of Nuclear Resource and Environment, East China University of Technology, Nanchang 330013, China
LAI Jing: No. 290 Research Institute, China National Nuclear Corporation, Shaoguan 512026, China
ZHOU Tang-bo: No. 290 Research Institute, China National Nuclear Corporation, Shaoguan 512026, China

DOI: https://doi.org/10.15898/j.cnki.11-2131/td.201901160007
Journal volume & issue: Vol. 38, no. 4
pp. 449 – 460

Abstract

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BACKGROUND The Shijiaowei uranium deposit (No.339 deposit) in the Eastern Guidong granite complex of Nanling region, is one of the large type deposits in the Xiazhuang uranium ore field. Uraninite, the main ore mineral of the Shijiaowei deposit, is the ideal mineral for geochronology. Previous studies show that the uranium mineralize ages of Shijiaowei deposit is 38-138Ma acquired by ID-TIMS and EMPA. OBJECTIVES To provide new insight for uranium metallogenic mechanism and background of the Shijiaowei deposit by a new reliable uranium mineralization age determination method. METHODS In situ LA-ICP-MS U-Pb dating method was used to constrain the formation age of uraninite from the Shijiaowei deposit. RESULTS The 206Pb/238U age of uraninite was 52.46-56.89Ma with the weighted average age of 54.68±0.53Ma (MSWD=1.19, n=18). The in situ U-Pb dating of the uraninite avoids the influence of mineral inclusions, secondary changes and micro-cracks on dating. CONCLUSIONS Therefore, the in situ U-Pb isotopic age of the uraninite determined by LA-ICP-MS represents the ore-forming age of the deposit. The ore-forming age (about 55Ma) is consistent with the main metallogenic period (about 50Ma) of the South China granite-type uranium deposit, indicating that the uranium mineralization of the Shijiao ore deposit is closely related to fault tectonic activity induced by the local extension of the lithosphere in South China.

Published in Yankuang ceshi

ISSN: 0254-5357 (Print)
Publisher: Science Press, PR China
Country of publisher: China
LCC subjects: Science: Geology; Science: Biology (General): Ecology
Website: http://www.ykcs.ac.cn/indexen.htm

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