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2018, 37(4) 1058-1067 DOI:
10.3969/j.issn.1004-5589.2018.04.006 ISSN: 1004-5589 CN: 22-1111/P |
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Characteristics of fluid inclusions of Zhuoma Cu-Pb-Zn deposit, northwestern Yunnan |
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JIANG Hai-yang1,2, MA Xue-li1, GAO Ming-bo2, WANG Ke-yong1, YANG He1 |
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1. College of Earth Sciences, Jilin University, Changchun 130061, China;
2. No.1 Institute of Geology and Mineral Resources of Shandong Province, Jinan 250014, China |
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Abstract：
Zhuoma Cu-Pb-Zn deposit, located in northeastern Garze arc,Shangrila,Yunnan Province, is a porphyry-hydrothermal vein-type deposit. Ore bodies are mainly hosted in quartz monzonite porphyry and controlled by NW-trending faults. Cu polymetallic mineralization in this deposit consists of four stages of paragenesis, namely (Ⅰ) pyrite-quart, (Ⅱ) pyrite ±chalcopyrite-quartz, (Ⅲ) pyrite ±chalcopyrite ±galena ±sphalerite-quartz and (Ⅳ) barren sulfide-quartz-carbonate. The comprehensive study on petrography, microthermometry and laser Raman of fluid inclusions showed that:CO2-rich and liquid-rich fluid inclusions were observed in stage Ⅰ; C-type, CO2-rich, CO2-bearing and liquid-rich fluid inclusions were observed in stage Ⅱ; only CO2-bearing and liquid-rich fluid inclusions were observed in stage Ⅲ; CO2-rich, CO2-bearing and liquid-rich fluid inclusions were observed in stage Ⅳ. Laser Raman spectrum suggest that the main components of C-type inclusions are CO2 and CH4, while in CO2 inclusions, there are some H2O in addition to CO2 and CH4 in gas phase. Comprehensive research indicates that the ore-forming fluids in Zhuoma deposit are characterized by a medium temperature, low salinity CO2-CH4-NaCl-H2O system of hydrothermal fluids, and the immiscibility of fluids is a key factor leading to the discharging of minerals in mineralization. |
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Keywords：
Zhuoma Cu-Pb-Zn deposit
fluid inclusion
Yunnan
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Received 2018-07-07 Revised 2018-10-25 Online: |
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DOI: 10.3969/j.issn.1004-5589.2018.04.006 |
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Email: 2269548350@qq.com |
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