北喜马拉雅扎西康铅锌锑银矿床成因的多元同位素制约

张建芳; 郑有业; 张刚阳; 高顺宝; 叶先仁; 张众; 刘敏院; 李及秋

doi:10.3799/dqkx.2010.113

Volume 35 Issue 6

Jun. 2010

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ZHANG Jian-fang, ZHENG You-ye, ZHANG Gang-yang, GAO Shun-bao, YE Xian-ren, ZHANG Zhong, LIU Min-yuan, LI Ji-qiu, 2010. Genesis of Zhaxikang Pb-Zn-Sb-Ag Deposit in Northern Himalaya: Constraints from Multi-Isotope Geochemistry. Earth Science, 35(6): 1000-1010. doi: 10.3799/dqkx.2010.113

Citation:

ZHANG Jian-fang, ZHENG You-ye, ZHANG Gang-yang, GAO Shun-bao, YE Xian-ren, ZHANG Zhong, LIU Min-yuan, LI Ji-qiu, 2010. Genesis of Zhaxikang Pb-Zn-Sb-Ag Deposit in Northern Himalaya: Constraints from Multi-Isotope Geochemistry. Earth Science, 35(6): 1000-1010. doi: 10.3799/dqkx.2010.113

Citation:

ZHANG Jian-fang, ZHENG You-ye, ZHANG Gang-yang, GAO Shun-bao, YE Xian-ren, ZHANG Zhong, LIU Min-yuan, LI Ji-qiu, 2010. Genesis of Zhaxikang Pb-Zn-Sb-Ag Deposit in Northern Himalaya: Constraints from Multi-Isotope Geochemistry. Earth Science, 35(6): 1000-1010. doi: 10.3799/dqkx.2010.113

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Genesis of Zhaxikang Pb-Zn-Sb-Ag Deposit in Northern Himalaya: Constraints from Multi-Isotope Geochemistry

doi: 10.3799/dqkx.2010.113

1.
Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China
2.
School of the Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China
3.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China
4.
Lanzhou Institute of Geology, Chinese Academy of Sciences, Lanzhou 730000, China
5.
Tibet Huayu Mining Industry Company Limited, Lhasa 850000, China

Received Date: 2010-05-27
Publish Date: 2010-11-01

Abstract

Abstract

Zhaxikang deposit is the only large Pb-Zn-Sb-Ag symbiotic deposit in the northern Himalayas gold-antimony polymetallic belt, with its ore body located in the high-angle twisting fault zone striking SN direction. The δ³⁴S of pyrite, sphalerite, galena, jamesonite, stibnite ranges from 4.5‰ to 12.0‰, with the majority ranging from 8‰ to 11‰, and it is enriched in sulfur with a narrow range, indicating that the same sulfur source, mainly from the rock formation in the marine sulfur reduction. The ratio of ²⁰⁶Pb/²⁰⁴Pb, ²⁰⁷Pb/²⁰⁴Pb and ²⁰⁸Pb/²⁰⁴Pb is at 18.474-19.637, 15.649-15.774 and 39.660-40.010 respectively, falling near the upper crust of lead evolution line within the investment plan, and into a straight line. δD_V-SMOW values of water in fluid inclusions of quartz varies from -127‰ to -135‰, δ¹⁸O_H₂O to -13.7‰ to 12.4‰, in the distribution of geothermal water in Tibet. He-Ar isotopes shows that the ore-forming fluid was mainly derived from rustal fluids and saturated meteoric water, and apparently there is no mixing mantle fluid composition. The multi-isotope composition of the deposit has significant difference with gold or gold-antimony deposit in North Himalayan metallogenic belt, which indicates its unique mineralization of Zhaxikang deposits. As the Indian plate colliding to Eurasian plate in Miocene post-collisional transition environment from intra-continental orogeny to extension slip in North Himalayan belt, there formed a series of high-angle fault zones of SN direction, causing partial melting of crust which increased local heat flux sharply and geothermal gradient anomalies driving groundwater convection cycle, extracting metallogenic elements from Late Triassic-Early Cretaceous turbidite or black carbon and silicon gray mudstone strata The deposit formed by replacement and filling along the SN fault zone, which belongs to sedimentary-structural-geothermal water multi-stage replacement and hydrothermal vein deposits.
- isotope,
- lead-zinc-antimony and silver ore deposit,
- deposit geology,
- deposit genesis,
- geochemistry,
- North Himalayan

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Genesis of Zhaxikang Pb-Zn-Sb-Ag Deposit in Northern Himalaya: Constraints from Multi-Isotope Geochemistry

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