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Geoscience ›› 2011, Vol. 25 ›› Issue (2): 228-235.

• Water Resource and Environment • Previous Articles     Next Articles

Re-Os Dating of Molybdenite and Sulfur Isotope Analysis of  the Yaogangxian Tungsten Polymetallic Deposits in Hunan Province and Their Geological Significance

LI  Shun-Ting1,2,WANG  Jing-Bin2,ZHU  Xin-You2,LI  Chao3   

  1. 1.School of Earth Sciences and Resources, China University of Geosciences, Beijing100083,China;2.Beijing Institute of Geology and
    Mineral Resources, Beijing100012,China;3.National Analytic Center of Geology, Beijing100037,China
  • Online:2011-04-25 Published:2011-05-13

Abstract:

The Yaogangxian tungsten polymetallic ore-field consisting of Yaogangxian tungsten deposit, Qing-shanli lead-zinc deposit and Heshangtan scheelite deposit, is located in the central part of the Nanling metallogenic belt. Detailed field geological investigation shows that three deposits are rather close in space, occurrence of ore body and ore-control factors.Re-Os dating of molybdenite was performed to determine the age of mineralization of Yaogangxian tungsten deposit and Heshangtan scheelite deposit. Re-Os isochron ages of molybdenite from the Yaogangxian tungsten deposit and the Heshangtan scheelite deposit were obtained by (158±1.2)Ma (n=7, MSWD=1. 3) and (160±3.3)Ma (n=6,MSWD=2.7), respectively. It indicates that two kinds of tungsten mineralization were formed in the same period, and also highly anastomosed with Yaogangxian composite pluton in time and place, and are part of the second large-scale mineralization in Nanling.The δ34S values of ore mineral (pyrite, sphalerite, molybdenite)from three deposits show variations from -1.8‰ to+1.4‰. The characteristics of spatiality, chronology and sulfur isotopes, together suggest these three deposits are different parts of the same magmatic ore-formation.

Key words: tungsten polymetallic ore-field, molybdenite Re-Os isochron age, sulfur isotopic composition, geological significance, Yaogangxian in Hunan Province

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