河南洛宁沙沟Ag-Pb-Zn矿床银的赋存状态及成矿机理

李占轲; 李建威; 陈蕾; 张素新; 郑曙

doi:10.3799/dqkx.2010.077

Volume 35 Issue 4

Jul. 2010

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Article Navigation > Earth Science > 2010 > 35(4): 621-636

LI Zhan-ke, LI Jian-wei, CHEN Lei, ZHANG Su-xin, ZHENG Shu, 2010. Occurrence of Silver in the Shagou Ag-Pb-Zn Deposit, Luoning County, Henan Province: Implications for Mechanism of Silver Enrichment. Earth Science, 35(4): 621-636. doi: 10.3799/dqkx.2010.077

Citation:

LI Zhan-ke, LI Jian-wei, CHEN Lei, ZHANG Su-xin, ZHENG Shu, 2010. Occurrence of Silver in the Shagou Ag-Pb-Zn Deposit, Luoning County, Henan Province: Implications for Mechanism of Silver Enrichment. Earth Science, 35(4): 621-636. doi: 10.3799/dqkx.2010.077

Citation:

LI Zhan-ke, LI Jian-wei, CHEN Lei, ZHANG Su-xin, ZHENG Shu, 2010. Occurrence of Silver in the Shagou Ag-Pb-Zn Deposit, Luoning County, Henan Province: Implications for Mechanism of Silver Enrichment. Earth Science, 35(4): 621-636. doi: 10.3799/dqkx.2010.077

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Occurrence of Silver in the Shagou Ag-Pb-Zn Deposit, Luoning County, Henan Province: Implications for Mechanism of Silver Enrichment

doi: 10.3799/dqkx.2010.077

LI Zhan-ke^{1, 2},
LI Jian-wei^{1, 2
,
,},
CHEN Lei^{1, 2},
ZHANG Su-xin¹,
ZHENG Shu¹

1.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China
2.
Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China

Received Date: 2010-03-08
Publish Date: 2010-07-01

Abstract

Abstract

The Shagou Ag-Pb-Zn vein-type deposit, located in the Luoning county of Henan Province, is hosted in amphibolite facies metamorphic rocks of the Archean Taihua Group and consists of four stages of mineralization: the quartz-siderite stage (Ⅰ), the quartz-sphalerite stage (Ⅱ), the quartz-silver minerals-galena stage (Ⅲ), and the quartz-carbonate stage (Ⅳ), with stages Ⅱ and Ⅲ being the main mineralization stages. Scanning electron microscopy-energy dispersive spectrometry (SEM-EDS) and electron microprobe (EMP) analysis suggests that both visible and invisible Ag are present in the ores. Invisible Ag occurs mainly as sub-micron inclusions (< 1 μm) within chalcopyrite, sphalerite and other sulphide minerals, whereas visible Ag occurs as silver minerals that replaced galena, chalcopyrite and other sulphides, or fills microfractures in sulphides and quartz. Combined with existing fluid inclusion data, our results indicate that Ag⁺, Pb⁺, Zn⁺ and other metal ions were transported as chloride complexes at the early high-temperature stage. When temperature and oxygen fugacity of the fluids descended, coupled with increasing pH, chloride complexes started to decompose to liberate Ag⁺, Pb⁺, Zn⁺ to form HS^- complexes. Continuous drop of temperature and likely degassing of ore fluids, led to separation of Pb⁺ and Zn⁺ from HS^- to form galena and sphalerite, into which some amounts of Ag⁺ were incorporated, forming sub-microscopic to microscopic silver inclusions. With the changes of composition and property of ore-forming fluids caused by precipitation of voluminous sulfide, Ag⁺ was released from HS^- complex to combine with Cu⁺ and Sb³⁺, forming silver minerals (e.g. polybasite, jalpaite and native silver).
- Xiong'er mineral district,
- Ag-Pb-Zn deposit,
- mineralogy,
- occurrence of silver,
- enrichment mechanism

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References(56)

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Occurrence of Silver in the Shagou Ag-Pb-Zn Deposit, Luoning County, Henan Province: Implications for Mechanism of Silver Enrichment

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