Study On The Metallogeny Of Copper Deposits In Beishan Area, Gansu Province

The geotectonic evolution is divided into pre - geosynclinal phase(Ar-# ), geosynclinal phase(O- T2X platform phase(T3 - J2) and Diwa phase (J3 - Q) in the Beishan area according to sedimentary formation and magatic formation. The dissertation researches into the genetic type of Gongpoquan and Baishantang copper deposit. Base on the majar - elemen, trace - element, race ?element content of a large number porphyry and volcanic rock in the Gongpoquan copper ore district, this dissertation studies minerogenetic mechanism of Gongpoquan porphyry copper deposit on the source of matter, the type of deposit,the enrichment and minerogenetic mechanism of copper. The minerogenetic geotectonic background of typical copper deposits is proved according to the geotectonic evolution,genetic type of deposit, the genetic type of metallogenic mother rock and metallogenic epoch, and the results show: Gongpoquan volcanic rock type copper deposit formed in late eu-geosyncline phase, Gongpoquan porphyry copper deposit formed in orogenic phase, Baishantang copper deposit formed in geosynclinal phase.