Geochemical characteristics and ore genesis of gold deposits in southwestern Hunan Province
Peng Jiantang Hu Ruizhong(Open Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002)
The geochemical study indicates that Wuqiangxi Formation, formed at the active continental margin, is the gold sourcebed in southwestern Hunan. It is revealed that Pb, S, Sr isotopes of gold deposits in this area originate from the host rocks. The composition of ore forming fluid and its H, O isotope features reveal its origin of meteoric water, and the ore forming fluid is characterized by the low temperature, low salinity, medium density, low oxygen fugacity, medium weakly alkaline. Gold mineralization in this area took place in Caledonian period rather than in Wuling Xuefeng periods or Yanshanian period as expected, and its ore genesis can be placed into the meteoric hydrothermal reworking deposit.
【CateGory Index】： P594