SHEN Neng-ping1, SU Wen-chao1, FU Ya-zhou1, XU Chun-xia1, 2, YANG Jie-hua1, CAI Jia-li1
（1. State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China；
2. University of Chinese Academy of Sciences, Beijing 100049, China）
Abstract: The Sulfur and lead isotopic compositions of stibnite from Banian antimony deposit, located in Dushan County, Guizhou Province, one of representative antimony deposits in the South China Sb belt, whose orebodies hosted by the Dushan Formation of the Middle Devonian, were systematically analyzed in this study. The results show that δ34S values of stibnite range from -5.4‰ to -1.2‰ with an average of -4.2‰. The calculated δ34SΣS value in ore-forming fluid is -0.1‰, indicating that sulfur of stibnite may be sourced from magma. Lead isotopic compositions vary over a narrow range, with 206Pb/204Pb = 18.561－19.156 (averaging 18.813), 207Pb/204Pb = 15.703－15.769 (averaging 15.734) and 208Pb/204Pb = 38.573－39.207 (averaging 38.906). The majority of ore lead is normal. Meanwhile, the characteristics of ore lead isotopes of Banian deposit are consistent with that of regional lead from the South China. We conclude that the metal (mainly Sb) of this deposit is dominantly derived from the Devonian host rocks and partly possible derived from the basement strata.
Key words: stibnite; sulfur isotope; lead isotope; source of ore-forming material; Banian antimony deposit
E-mail: shennengping@vip.gyig.ac.cn
ACTA MINERALOGICA SINICA Vol. 33, No. 3, 2013, Page 271-287
