Mineralized feature, tectonic setting and metallogenic type of Tongyugou cupper deposit, Qinghai province

Tongyugou cupper deposit located at the Triassic sedimentary basin of Hainai(to the South of Qinghai Lake) occures in a olistostrome felt with E-W orientation and in the transitional position from marene sedimentary series to volcanic-sedimentary series, which is characterized by typical dedded orebodies and association with wrigglites and silicon-rich se- dimenta ry rocks. On the basis of the sedimentary formation, sedimentary facies of ore-bea- ring series and the nature of the volcanic rocks, the tectonic setting of the deposit is considered to be spreading-subsidence basin existting in continental margin. The contrast to different stratiform sulfide deposits indicate Tongyugou deposit is between Sedex type and Besshi type but closer to the latter.