Nature and Evolution of the Ore-Forming Fluids from Nanmushu Carbonate-Hosted Zn-Pb Deposit in the Mayuan District, Shaanxi Province, Southwest China

被引:8
作者
Xiong, Suo-Fei [1 ,2 ]
Gong, Yong-Jun [1 ,2 ]
Yao, Shu-Zhen [1 ,2 ]
Shen, Chuan-Bo [1 ,2 ]
Ge, Xiang [1 ,2 ]
Jiang, Shao-Yong [1 ,2 ,3 ]
机构
[1] China Univ Geosci, Fac Earth Resources, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Hubei, Peoples R China
[2] China Univ Geosci, Collaborat Innovat Ctr Explorat Strateg Mineral R, Wuhan 430074, Hubei, Peoples R China
[3] Nanjing Univ, Dept Earth Sci, State Key Lab Mineral Deposits Res, Nanjing 210093, Jiangsu, Peoples R China
基金
中国国家自然科学基金;
关键词
THERMOCHEMICAL SULFATE REDUCTION; FISCHER-TROPSCH SYNTHESIS; LEAD-ZINC DEPOSITS; SOUTHEAST MISSOURI; VIBURNUM TREND; TRACE-ELEMENTS; YANGTZE BLOCK; SW CHINA; INCLUSIONS; ISOTOPE;
D O I
10.1155/2017/2410504
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
The Nanmushu carbonate-hosted Zn-Pb deposit is located in the Mayuan district of Shaanxi Province, a newly discovered metallogenic district next to the Sichuan Basin, in the northern margin of the Yangtze Block, which is the largest and the only one that is currently mined in this district. The delta S-34 values of sulfides are characterized by positive values with a peak around +18%, and the reduced sulfur may have derived from reduction of SO42- from paleoseawater or evaporitic sulfates that have possibly been leached by basinal brines during mineralization stage. Detailed fluid inclusion study shows two types of fluids in the sphalerite, quartz, dolomite, calcite and barite, that is, aqueous-salt dominant inclusions (type I) and hydrocarbon-bearing inclusions (type II). The Laser Raman spectroscopy study shows occurrence of certain amount of CH4, C4H6, and bitumen. The salinities show similar values around 6 to 12 wt% NaCl equivalent but a decreasing temperature from early to late stages (typically 200 degrees to 320 degrees C in stage I, 180 degrees to 260 degrees C in stage II, and 140 degrees to 180 degrees C in stage III). These features may be related to basinal brines mixing between an external higher salinity CaCl2 +/- MgCl2-rich fluid and a local H2O-NaCl methane-rich fluid.
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页数:19
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