Constraint of Pb Isotope on Ore-Forming Source Origin of Nuri Polymetallic Deposit, Tibet

被引：0

作者：

Yan G. ^{[1
,2
]}

Wang X. ^{[3
]}

Huang Y. ^{[4
]}

Li G. ^{[4
]}

Liu H. ^{[4
]}

Huang H. ^{[4
]}

Zhang Z. ^{[4
]}

Tian E. ^{[4
]}

Lai Y. ^{[5
]}

机构：

[1] Tianjin Center, China Geological Survey, Tianjin

[2] Key Laboratory of Uranium Geology, China Geological Survey, Tianjin

[3] Institute of Coal Engineering, Shanxi Datong University, Datong

[4] Chengdu Center, China Geological Survey, Chengdu

[5] Institute of Mineral Resources Multi-Utilization, China Geological Survey, Chengdu

来源：

Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | 2020年 / 45卷 / 01期

关键词：

Adakite porphyry; Gangdese; Geochemistry; Nuri Polymetallic; Ore-forming source; Pb isotope;

D O I：

10.3799/dqkx.2019.191

中图分类号：

学科分类号：

摘要：

The Nuri Polymetallic Deposit, Tibet, is the largest and first scheelite deposit in Gangdese, and there have been some controversies on the ore-forming source of this deposit. The Pb isotope analyses of molybdenite, chalcopyrite, and pyrites from the mine have been carried out to determine the source. The results show that the molybdenite and pyrites have the consistent Pb isotopes, with 206Pb/204Pb ratios ranging from 17.525-18.581, 207Pb/204Pb ratios ranging from 15.621-15.661, 208Pb/204Pb ratios ranging from 37.524-38.929, and the chalcopyrite with 206Pb/204Pb ratios ranging from 18.414-18.578, 207Pb/204Pb ratios ranging from 15.619-15.642, and 208Pb/204Pb ratios ranging from 38.617-38.863, respectively, which have obvious grouping characteristics. The S and Pb isotope features indicate that the ore-forming sources are mainly derived from the mantle, and the Re-Os isotope characteristics of molybdenite indicate that the minerals are mainly derived from mantle. The melt from the lower crust of India continent partial melting migrated upward and mixed with the Fe3+ enriched fluid derived from the subducted oceanic crust, which metasomatized with Yarlung Zangbo MORB peridotite, and the Cu, Mo were released into the magma system after oxidezed by Fe3+, thus, Cu and other elements in biotite granite which partially melted in the thickened lower crust were extracted in the rising process, finally formed the deposit by contact metasomatism with the wall rock. © 2020, Editorial Department of Earth Science. All right reserved.

引用

页码：31 / 42

页数：11

共 43 条

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