新疆玉海-三岔口铜矿黑云母矿物化学特征及成岩成矿意义

龚林; 陈华勇; 王云峰; 赵联党; 肖兵

doi:10.3799/dqkx.2018.145

Volume 43 Issue 9

Sep. 2018

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Article Navigation > Earth Science > 2018 > 43(9): 2929-2942

Gong Lin, Chen Huayong, Wang Yunfeng, Zhao Liandang, Xiao Bing, 2018. Petrogenesis and Mineralization of Yuhai and Sanchakou Copper Deposit: Constraints from Mineral Chemistry of Biotite in Xinjiang, Northwestern China. Earth Science, 43(9): 2929-2942. doi: 10.3799/dqkx.2018.145

Citation:

Gong Lin, Chen Huayong, Wang Yunfeng, Zhao Liandang, Xiao Bing, 2018. Petrogenesis and Mineralization of Yuhai and Sanchakou Copper Deposit: Constraints from Mineral Chemistry of Biotite in Xinjiang, Northwestern China. Earth Science, 43(9): 2929-2942. doi: 10.3799/dqkx.2018.145

Citation:

Gong Lin, Chen Huayong, Wang Yunfeng, Zhao Liandang, Xiao Bing, 2018. Petrogenesis and Mineralization of Yuhai and Sanchakou Copper Deposit: Constraints from Mineral Chemistry of Biotite in Xinjiang, Northwestern China. Earth Science, 43(9): 2929-2942. doi: 10.3799/dqkx.2018.145

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Petrogenesis and Mineralization of Yuhai and Sanchakou Copper Deposit: Constraints from Mineral Chemistry of Biotite in Xinjiang, Northwestern China

doi: 10.3799/dqkx.2018.145

Gong Lin^{1,2
,},
Chen Huayong^{1,3
,
,},
Wang Yunfeng^1,2,
Zhao Liandang^1,2,
Xiao Bing¹

1.
Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
2.
University of Chinese Academy of Sciences, Beijing 100049, China
3.
Guangdong Provincial Key Laboratory of Mineral Physics and Materials, Guangzhou 510640, China

Received Date: 2018-04-10
Publish Date: 2018-09-15

Abstract

Abstract

Mineral composition of biotite is a significant indicator of revealing the crystallization conditions, petrogenesis, mineralization and evaluation of ore-bearing potential in porphyry copper deposit systems. This study utilizes electron microprobe analyses (EPMA) to determine the mineral composition of biotite in Yuhai and Sanchakou porphyry copper deposits, Xinjiang. The EPMA data shows that the characteristics of biotite are rich in magnesium and poor in iron in ore-bearing intrusions; whereas those in ore-barren intrusions are rich in iron and poor in magnesium. The biotite is mainly composed of re-equilibrated Mg-biotite in ore-bearing intrusions and is primary Fe-biotite in ore-barren intrusions. The host rocks of all the biotite are I-type granite and are formed during subduction. The ore-bearing magma was derived from the mixing of mantle and crust, however, the ore-barren magma was mainly generated from crust with involvement of juvenile crustal components during formation. The crystallization temperature and pressure of biotites are 529-677℃ and 1.1-2.8 kbar, and they formed in the condition of high oxygen fugacity. In addition, the Mg/Fe and Fe²⁺/(Fe²⁺+Mg²⁺) of biotites may be used as a tool to discriminate between the ore-bearing and ore-barren intrusions in porphyry copper systems.
- mineral composition,
- biotite,
- petrogenesis and mineralization,
- Xinjiang,
- Yuhai-Sanchakou copper deposits,
- geochemistry

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References(59)

References

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Petrogenesis and Mineralization of Yuhai and Sanchakou Copper Deposit: Constraints from Mineral Chemistry of Biotite in Xinjiang, Northwestern China

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