Fluid inclusions investigation of Tudiping Pb-Zn deposit, Huayuan orefield, western Hunan: Implications for ore-forming mechanism

被引：0

作者：

Zhou H.-D. ^{[1
,2
]}

Shao Y.-J. ^{[1
]}

Wei H.-T. ^{[1
]}

Xiong Y.-Q. ^{[1
]}

Zheng M.-H. ^{[1
,3
]}

Zhang Y. ^{[1
,4
]}

机构：

[1] Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education, Central South University, Changsha

[2] Hunan Key Laboratory of Land and Resources Evaluation and Utilization, Hunan Planning Institute of Land and Resources, Changsha

[3] Non-Ferrous Metals and Nuclear Industry Geological Exploration Bureau of Guizhou, Guiyang

[4] Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou

来源：

Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | 2018年 / 28卷 / 04期

关键词：

Lead-zinc deposit; Ore deposition; Ore-forming fluid; Thermochemical sulfate reduction; Tudiping;

D O I：

10.19476/j.ysxb.1004.0609.2018.04.19

中图分类号：

学科分类号：

摘要：

Detailed field investigation and petrological observation on the Tudiping Pb-Zn deposit indicated that the mineralization could be subdivided into three stages: (Ⅰ) sphalerite-dolomite, (Ⅱ) sphalerite-galena-barite-fluorite and (Ⅲ) galena-calcite stages. A comparative investigation was performed on fluid inclusions trapped in sphalerite and coexisting gangue minerals, by (infrared) microthermometry and laser Raman analysis. The results reveal that the ore-forming fluid is a moderate-low temperature, moderate-high salinity NaCl-MgCl2-H2O system with considerable amounts of CaCl2 at stage Ⅰ and Ⅱ, and a low temperature and moderate salinity NaCl-H2O system at stage Ⅲ. The vapor phase composition comprises H2O, CH4 and H2S, and the concentrations of the reductive gas increase from stage Ⅰ to Ⅱ and decrease from stage Ⅱ to Ⅲ. Both fluid inclusions trapped in sphalerite and coexisting gangue minerals are featured by fluid mixing and oxygen fugacity change, indicative of being derived from the same fluid system. However, an evolution delay was found in fluid inclusions trapped in sphalerite. The ore deposition is related to thermochemical sulfate reduction (TSR) under the background of fluid mixing at stages Ⅰ and Ⅱ, and influenced by dilution and cooling resulting from meteoric water at stage Ⅲ. The coupling effect between TSR and carbonate dissolution plays a significant role in the ore deposition mechanism of the Tudiping Pb-Zn deposit. © 2018, Science Press. All right reserved.

引用

页码：802 / 816

页数：14

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