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LI Zhuang, LANG Xing-hai, DING Shuai, LI Hai-feng, YANG Zong-yao, SHI Shuo, WANG Li-qiang, LI Yu-hai. A Study of the Modes of Occurrence of Silver in the Sinongduo Epithermal Ag-Pb-Zn Deposit, Tibet[J]. Acta Geoscientica Sinica, 2017, (5): 687-701. doi: 10.3975/cagsb.2017.05.09
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A Study of the Modes of Occurrence of Silver in the Sinongduo Epithermal Ag-Pb-Zn Deposit, Tibet
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Abstract
The Sinongduo Ag-Pb-Zn deposit is a medium-large sized low-sulfidation hydrothermal deposit discovered for the first time in the Linzizong volcanic rock of the Gangdise metallogenic belt. There are various mineral assemblages and structures, and this deposit has the typical characteristics of hydrothermal mineralization. The periods of the mineralization in this deposit can be mainly divided into three stages: (I) sphalerite-chalcopyrite-enargite-pyrite-quartz stage, (II) galena-sphalerite-silver mineral stage, and (III) pyrite-quartz-calcite. Through field investigation, geological logging, microscopic observation and electron microprobe analysis (EPMA), the authors studied the modes of occurrence of the silver in Sinongduo deposit. The results show that the silver primarily exists in the form of independent silver minerals, and the other sulfides such as sphalerite, galena, pyrite and chalcopyriteonly contain very little silver. The silver minerals mainly include peaceite, argentite, pyrargyrite, akanthite and native silver, which occur in the fissures of the Fe-Mn carbonates, jasper and the early sulfides. Moreover, several silver minerals exist in the form of being wrapped in the sulfide. Some invisible silver can be found in the enargite. The silver mineralization occurred at No. II metallogenic stage and the silver was carried in the form of sulfur complex migration. With the change of physical and chemical conditions of the ore-forming fluid, the silver precipitated and formed different kinds of silver minerals.-
Keywords:
- modes of occurrence /
- silver minerals /
- epithermal deposit /
- Linzizong Group /
- Sinongduo
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LI Zhuang, LANG Xing-hai, DING Shuai, LI Hai-feng, YANG Zong-yao, SHI Shuo, WANG Li-qiang, LI Yu-hai. A Study of the Modes of Occurrence of Silver in the Sinongduo Epithermal Ag-Pb-Zn Deposit, Tibet[J]. Acta Geoscientica Sinica, 2017, (5): 687-701. doi: 10.3975/cagsb.2017.05.09
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