Petrogenesis and Its Relationship with Uranium Mineralization of Gabbro-Diorite in Changjiang Uranium Ore-Field, Northern Guangdong Province, China

被引：3
|
作者：
Zhong F. [1 ]
Pan J. [1 ]
Wu J. [1 ]
Xia F. [1 ]
Fu S. [2 ]
Qi J. [2 ]
Zhao Q. [3 ]
机构：
[1] State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang
[2] Research Institute No.290, CNNC, Shaoguan
[3] Research Institute No.270, CNNC, Nanchang
来源：
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | 2019年 / 44卷 / 09期
关键词：
Changjiang uranium ore-field; Gabbro-diorite; Geochronology; Intersection type uranium; Lithospheric thining; Uranium mineralization;
D O I：
10.3799/dqkx.2017.592
中图分类号：
学科分类号：
摘要：
Understanding for uranium mineralization was absolutely restricted by the petrogenesis of gabbro-diorite,which emplaced into the Yanshanian biotite granite at the deep part of Changjiang uranium ore-field. We provide LA-ICP-MS zircon U-Pb age, Lu-Hf isotopic, mineralogical and geochemical evidence to analyse the poetrogenesis, tectonic background and its relationship with uranium mineralization. Gabbro-diorite emplaced at the Late Jurassic (LA-ICP-MS zircon U-Pb isotopic age: 150±1 Ma (n=17,MSWD=0.18) ) and was geochemically characteristic of within-plate basalt. The magma evolution process (ranges from basic to neutral magma) has been effectively recorded by the transformation of major elements in zoned plagioclase and biotite from gabbro-diorite. The zircon εHf(t) values range from -14.1 to -8.6 and the two-stage model ages (tDM2) range from 1.7 Ga to 2.1 Ga. The magmatic source was the relatively enriched mantle changed by the metasomatism fluid originated from the subduction zone of Pacific Ocean Plate which started from the Middle Jurassic. Gabbro-diorite has undergone a variational degree crustal contamination with the Proterozoic-Palaoproterozoic crustal material in the process of emplacement during the Late Mesozoic large scale lithosphere thining tectonic background. Gabbro-diorite provides a better reductive environment than the granite for uranium mineralization, prompting U6+ been reduced to pitchblende in the ore forming hydrothermal fluid. © 2019, Editorial Department of Earth Science. All right reserved.
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页码：3042 / 3059
页数：17
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