Geology, Geochemistry and Re-Os Age of the Qiaoxiahala Deposit in NW China: Evidence of an Overprinted Fe(-Cu/Au) Deposit

Zhongjiang Zang; Wei Liu; Leilei Dong

doi:10.1007/s12583-020-1054-y

Volume 32 Issue 1

Mar 2021

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Journal of Earth Science > 2021 > 32(1): 208-218.

Zhongjiang Zang, Wei Liu, Leilei Dong. Geology, Geochemistry and Re-Os Age of the Qiaoxiahala Deposit in NW China: Evidence of an Overprinted Fe(-Cu/Au) Deposit. Journal of Earth Science, 2021, 32(1): 208-218. doi: 10.1007/s12583-020-1054-y

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Zhongjiang Zang, Wei Liu, Leilei Dong. Geology, Geochemistry and Re-Os Age of the Qiaoxiahala Deposit in NW China: Evidence of an Overprinted Fe(-Cu/Au) Deposit. Journal of Earth Science, 2021, 32(1): 208-218. doi: 10.1007/s12583-020-1054-y

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Geology, Geochemistry and Re-Os Age of the Qiaoxiahala Deposit in NW China: Evidence of an Overprinted Fe(-Cu/Au) Deposit

doi: 10.1007/s12583-020-1054-y

Zhongjiang Zang^1
,,
Wei Liu^{2
,
,
,},
Leilei Dong³

1.
Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China
2.
College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
3.
Key Laboratory of Deep-Earth Dynamics, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China

More Information

Corresponding author: Wei Liu, liuwei17@mails.ucas.edu.cn
Received Date: 09 May 2020
Accepted Date: 26 Jun 2020
Publish Date: 01 Feb 2021

Abstract

Abstract

Overprinting of an earlier formed deposit may obscure the nature of the deposit and hinder our understanding of regional metallogeny. The Qiaoxiahala Fe(-Cu/Au) deposit in eastern Junggar,NW China,is characterized by magnetite mineralization later replaced by sulfide minerals such as chalcopyrite. To reveal the genesis of Qiaoxiahala,we conducted Re-Os dating on post-magnetite molybdenite separated from chalcopyrite and rare earth elements (REEs) for basaltic volcanic rock,magnetite,chalcopyrite and diorite. An isochron age of 377±7 Ma was obtained together with a weighted mean age of 375±3 Ma,which is indistinguishable from mineralization ages determined in previous studies. Rare earth element (REE) data for basaltic volcanic rocks hosting the ore are comparable to that of the magnetite,while the REE signatures of chalcopyrite from the Cu ore and local intrusive diorite share a similar pattern. These suggest that two distinct fluid sources are responsible for the deposition of Fe and Cu in the Qiaoxiahala deposit. According to these experimental results,we consider that the iron mineralization in Qiaoxiahala is the result of fluid exsolution from basaltic volcanism which was further overprinted by fluids that deposited copper and gold,which may have been sourced from nearby dioritic intrusions.
- Qiaoxiahala,
- overprinted mineralization,
- East Junggar,
- Fe(-Cu/Au) mineralization,
- Re-Os age

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