河南银家沟矽卡岩型金矿的地质地球化学特征及成因

GEOLOGY, GEOCHEMISTRY AND GENESIS OF THE YINJIAGOU SKARN TYPE GOLD DEPOSIT,HENAN PROVINCE

通过全面论述其地质、地球化学特征、证明矿床应属典型的矽卡岩型金矿,矿床及含矿岩体形成于中生代华北与华南两板块碰撞造山的陆内俯冲作用过程中。

Located in Lingbao County, Henan Province, the Yinjiagou gold deposit lies at the contact zone between Mesozoic granitic body and dolomite of Guandaokou Group, where skarn is well developed. Studies on trace elements as well as sulfur and lead isotopes reveal that birnetasomatism took place during the ore-forming process. Mineralization and alteration exhibits obvious zonation, and from the rock body outwards there are in turn molybdenum→gold and pyrite→lead and zinc. The Yinjiagou gold deposit is therefore regarded as a skarn type deposit. Geological, geochemical and petrochemical studies of the ore-bearing rock body indicate that it is quite complicated in genesis, having syntectic type petrogenic mechanism and transformation type material basis. The rock body and its associated mineralizations are products of intracontinental subduction during the Mesozoic collision orogenesis between the South China plate and the North China plate. Special importance should be attached to Luoyuan-Lingbao-Lushi-Luanchuan area in prospecting for skarn type gold deposits.