六盘山弧形构造带铜多金属矿床的成矿环境

Mineralization Environments of the Cu Polymetallic Deposits in the Liupan Shan Arc Structure Belt

六盘山弧形构造带位于青藏高原东北缘,自震旦-寒武纪以来,经历了“威尔逊旋回”构造演化。在陆内裂谷和板块俯冲阶段,成矿类型主要为海底火山块状硫化物型和与韧性剪切作用有关的构造蚀变岩型,而在碰撞造山和陆内造山阶段,成矿类型演变为与大型推覆体构造有关的似层状热液型,显示出不同构造演化阶段所反映的成矿环境不同。

The Liupan Shan arc structure belt,located in the northeast edge of Qinghai-Xizang plateau, has gone through a whole geological and structural evolution process which was named 'Wilson cycle' since Sinian-Cambrian. The mineralization types are different in different evolution periods. During the continental rift and plate subduction period, the main mineralization is volcanic massive sulphide type at sea floor and tectonic alteration rock type which was related with ductile shear zone. While during the collision orogenies and continental orogenies, the main mineralization type is layer-like hydrothermal deposit which was related with large thrusting structure. It is very clear that different tectonic evolution stages reflect different minealization environments.