Geochemical Characteristics of Inclusions of Quartz in the Dehelongwa Copper-Gold Deposit, Tongren, Qinghai Province

KANG Ya-long; LIU Ji-shun; CAO Yong-hua

Northwestern Geology > 2013 > 46(3): 98-108.

KANG Ya-long, LIU Ji-shun, CAO Yong-hua. Geochemical Characteristics of Inclusions of Quartz in the Dehelongwa Copper-Gold Deposit, Tongren, Qinghai Province[J]. Northwestern Geology, 2013, 46(3): 98-108.

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Geochemical Characteristics of Inclusions of Quartz in the Dehelongwa Copper-Gold Deposit, Tongren, Qinghai Province

1.
School of Geosciences and Info-Physics, Central South University, Changsha 410083, China;Western Mining Company, Xining 810001, China
2.
School of Geosciences and Info-Physics, Central South University, Changsha 410083, China

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Received Date: August 17, 2011
Revised Date: December 27, 2011
Published Date: September 04, 2013

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Abstract

Abstract

Dehelongwa copper-gold deposit is a typical porphyry-type copper-gold deposit in the west Qinling mineralization belt, occurring mainly in fracture zone. Studies on quartz fluid inclusions show three main types of inclusions, namely H₂O-rich, CO₂-rich and saline daughter mineral inclusions. Microthermometry data suggests that prior to mineralization, the inclusion is powerful intrusion magmatic fluid, rich in Na⁺, K⁺ and so on. In the metallogenic period, the inclusion is NaCl-unsaturated magmatic fluid of high temperature and high salinity, with a boiling feature. After mineralizaion, the inclusion is a H₂O-NaCl-KCl system with moderate temperature, medium-low salinity and low density. The study shows that the ore-forming of copper and gold is mainly caused by the changes in temperature, salinity and pressure, the open formation, the increasing oxygen fugacity, and the declining fluid pH value.
- inclusion,
- geochemistry,
- Dehelongwa copper-gold deposit,
- Qinghai

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Geochemical Characteristics of Inclusions of Quartz in the Dehelongwa Copper-Gold Deposit, Tongren, Qinghai Province

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