赞比亚铜带省谦比希铜矿床成因：来自流体包裹体和H-O-S同位素地球化学证据

胡乔帆; 冯佐海; 莫江平; 方科; 刘俊辰; 蔡永丰; 邓贵安; 黄学强; 白令安; 覃鹏

doi:10.3799/dqkx.2020.328

Volume 46 Issue 5

May 2021

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Hu Qiaofan, Feng Zuohai, Mo Jiangping, Fang Ke, Liu Junchen, Cai Yongfeng, Deng Gui'an, Huang Xueqiang, Bai Ling'an, Qin Peng, 2021. Genesis of Chambishi Copper Deposit in Copperbelt Province of Zambia: Evidence from Fluid Inclusions and H-O-S Isotope Geochemisty. Earth Science, 46(5): 1554-1568. doi: 10.3799/dqkx.2020.328

Citation:

Hu Qiaofan, Feng Zuohai, Mo Jiangping, Fang Ke, Liu Junchen, Cai Yongfeng, Deng Gui'an, Huang Xueqiang, Bai Ling'an, Qin Peng, 2021. Genesis of Chambishi Copper Deposit in Copperbelt Province of Zambia: Evidence from Fluid Inclusions and H-O-S Isotope Geochemisty. Earth Science, 46(5): 1554-1568. doi: 10.3799/dqkx.2020.328

Citation:

Hu Qiaofan, Feng Zuohai, Mo Jiangping, Fang Ke, Liu Junchen, Cai Yongfeng, Deng Gui'an, Huang Xueqiang, Bai Ling'an, Qin Peng, 2021. Genesis of Chambishi Copper Deposit in Copperbelt Province of Zambia: Evidence from Fluid Inclusions and H-O-S Isotope Geochemisty. Earth Science, 46(5): 1554-1568. doi: 10.3799/dqkx.2020.328

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Genesis of Chambishi Copper Deposit in Copperbelt Province of Zambia: Evidence from Fluid Inclusions and H-O-S Isotope Geochemisty

doi: 10.3799/dqkx.2020.328

1.
Guangxi Key Laboratory of Hidden Metallic Ore Deposits Exploration, Guilin University of Technology, Guilin 541004, China
2.
China Nonferrous Metals (Guilin) Geology and Mining Co., Ltd., Guilin 541004, China
3.
Key Laboratory of Metallogeny and Mineral Assessment of Ministry of Natural Resources, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China

Received Date: 2020-11-23
Publish Date: 2021-05-15

Abstract

Abstract

Fluid inclusions study and H-O-S isotopic geochemical analysis of ore and vein minerals were carried out in this study in order to reveal the characteristics of ore-forming fluid and material of the Chambishi copper deposit. The results of microscopic measurement of temperature show that the homogenization temperature and salinity of the fluid inclusions from hydrothermal fluid filling deposit mainly range from 100 to 350 ℃ and 11% to 19% NaCl_eqv, respectively. Analyses of H-O isotopic composition of the hydrothermal fluid filling deposit show that the values of δD_V-SMOW and δ¹⁸O_H2O are -64.0‰ to -52.6‰ and 1.57‰ to 2.97‰, respectively. Analyses of S isotopic composition show that the values of δ³⁴S_CDT from hydrothermal fluid filling orebodies and depositional orebodies are 5.5‰ to 12.1‰ and 6.0‰ to 21.0‰, respectively. The above data indicate that the ore-forming fluid of the hydrothermal fluid filling deposit is of medium-low temperature, low-middle salinity and density, and belongs to Cl-Na-Ca-type aqueous solution. The fluid is a mix of mantle and crust-derived magmas. Fluid mixing is the main reason for copper precipitation. Sulfur of the hydrothermal fluid filling deposit is similar to those of mantle-derived sulfur, whereas the sulfur of the depositional ore deposit is mainly sourced from diagenetic sulphide and seawater sulfate. The mechanism of sulfate reduction for both deposits is thermochemical reduction which resulted in the change of sulfur from SO₄^2- to H₂S. The mixed sources of ore-forming fluid and material indicate that mineralization of the hydrothermal fluid filling deposit is closely related to the middle Neoproterozoic magmatism, whereas mineralization of the depositional ore deposit is mainly related to the strong Late Neoproterozoic orogenesis and regional metamorphism.
- fluid inclusion,
- H-O-S isotope,
- ore-forming fluid,
- Chambishi copper deposit,
- Zambia,
- ore deposit

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References(55)

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Genesis of Chambishi Copper Deposit in Copperbelt Province of Zambia: Evidence from Fluid Inclusions and H-O-S Isotope Geochemisty

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