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2013•Acta Mineralogica SinicaRequires access

Mineralogical Characteristics of Skarns in Langdu Skarn Copper Deposit,Zhongdian,Yunnan Province,China

Zhong Hong

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Abstract

Langdu skarn copper deposit is an important skarn copper deposit hosted by the transition zone of Triassic Qugasi Formation and intrusive rocks in Zhongdian area,NW Yunnan,China.Its skarn mineral mainly consists of garnet,pyroxene,amphibole,epidote and etc.Using electronic probe,we detailed analyzed the chemical composition of major skarn minerals.Results show that garnet is andradite to grossular solid solution series,ranging in composition of Ad57-94Gr6-41Al1-3.End-member of pyroxene is Hd78-92Di3-12Jo5-9,falling into calcium group.Actinolite,grunerite,epidote,and calcite are abundant.Different mineral assemblages reflect that the environment of skarn formation experienced the conversion from relatively high temperature under oxidation condition to low temperature under reduction condition.

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What this paper is about

Langdu skarn copper deposit is an important skarn copper deposit hosted by the transition zone of Triassic Qugasi Formation and intrusive rocks in Zhongdian area,NW Yunnan,China.Its skarn mineral mainly consists of garnet,pyroxene,amphibole,epidote and etc.Using electronic probe,we detailed analyzed the chemical composition of major skarn minerals.Results show that garnet is andradite to grossular solid solution series,ranging in composition of Ad57-94Gr6-41Al1-3.End-member of pyroxene is Hd78-92Di3-12Jo5-9,falling into calcium group.Actinolite,grunerite,epidote,and calcite are abundant.Different mineral assemblages reflect that the environment of skarn formation experienced the conversion from relatively high temperature under oxidation condition to low temperature under reduction condition.

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Available abstract

Langdu skarn copper deposit is an important skarn copper deposit hosted by the transition zone of Triassic Qugasi Formation and intrusive rocks in Zhongdian area,NW Yunnan,China.Its skarn mineral mainly consists of garnet,pyroxene,amphibole,epidote and etc.Using electronic probe,we detailed analyzed the chemical composition of major skarn minerals.Results show that garnet is andradite to grossular solid solution series,ranging in composition of Ad57-94Gr6-41Al1-3.End-member of pyroxene is Hd78-92Di3-12Jo5-9,falling into calcium group.Actinolite,grunerite,epidote,and calcite are abundant.Different mineral assemblages reflect that the environment of skarn formation experienced the conversion from relatively high temperature under oxidation condition to low temperature under reduction condition.

Key concepts: Skarn, Epidote, Actinolite, Geology, Pyroxene, Andradite, Geochemistry, Grossular

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Mineralogical Characteristics of Skarns in Langdu Skarn Copper Deposit,Zhongdian,Yunnan Province,China — Research Paper | ScholarLens