ON JINCHANGYU POST-DUCTILE-SHEARING GOLD DEPOSIT AND ITS GENISIS
Liu Shaubo Liu Liandeng Liu Chen (Department of Geology)
Jinchangyu gold deposit, located in the Qianxi county, Hebei province, is one of the largest gold deposit in China, The deposit occurs in the Mesozoic tectonomagmatic remobilized area at the north edge of North China Platform. The orebodies are hosted brittle faults overprinting on the ductile shearing zone in a tectonoschist belt. The occurrence of orebodies differs from the ductile shearing zone in that there is a great geological interval and a log time span between them. The deformation degree of ductile shearing does not correlate with gold grade (r = -0. 102). Au these facts indicate that Jinchangyu gold deposit belongs to postductile-shearing gold deposit defined by Liu Liandeng (1987, 1990, 1991). The deposit is closly related with the Mesozoic intrusion in spacial, themporal and geochemical, which manipest that it should belong to the tpye of magmatic hydrothermal.