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Geoscience ›› 2012, Vol. 26 ›› Issue (1): 54-60.

• Petrology and Study of Ore Deposits • Previous Articles     Next Articles

orming Process of Dongguashan Stratabound Skarn Cu Deposit in Tongling, Anhui Province—Evidence from Pyrrhotite

 YANG  Shuang, DU  Yang-Song, CAO  Yi, ZHANG  Zhi-Yu, LIU  Chao-Feng   

  1. State Key Laboratory of Geological Process and Mineral Resources, China University of Geosciences, Beijing, 100083, China
  • Received:2011-07-18 Revised:2011-11-25 Online:2012-02-22 Published:2012-02-25

Abstract:

Dongguashan copper deposit is one of representative stratabound skarn Cu deposits in Tongling, Anhui Province, and pyrrhotite is a type of ore minerals widely distributed in the deposit. Field investigation and microscopic observation indicate occurrence of sedimentary, thermally metamorphic, and hydrothermal metasomatic textures and structures in pyrrhotite ores from the deposit. Mineralogic study shows large difference in composition of pyrrhotite from the different ores, with Fe content ranging from 57.78% to 60.67%. There occur hexagonal (high temperature) and monoclinic (lowtemperature) pyrrhotite mainly formed by desulfurization of pyrite. A complex metallogenic process of early sediment and middle thermal metamorphism followed by late magmatic hydrothermal metasomatism may be responsible for the formation of the Dongguashan copper deposit.

Key words: Dongguashan stratabound skarn copper deposit, pyrrhotite, forming process, Tongling in Anhui Province