Ren Tao1, ZHONG Hong2, ZHANG Xing-chun2, HAN Run-sheng1, MA Mei-juan1
(1. Faculty of Land and Resource Engineering, Kunming University of Science and Technology, Kunming 650093, China;
2. State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences,
Guiyang 550002, China)
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 words: skarn; mineralogy; copper deposit; Yunnan
E-mail: rtao1982@126.com
ACTA MINERALOGICA SINICA Vol. 33, No. 3, 2013, Page 278-286
