青海加吾矿区地层控矿作用及赋矿特征

Strata-bound mineralization process and ore-bearing characteristics of the Jiawu deposit,Qinghai

青海省加吾矿区处在东昆仑—西秦岭衔接部位的青海南山微造山带内。区内地层主要由中三叠统的一套浅海、滨海相浊积岩组成。该套地层中粒级较细的泥质、炭质板岩对矿体产出控制作用明显。矿体多集中在炭质板岩层间破碎带内。金属矿物组合主要为黄铁矿、毒砂。成矿流体主要来自围岩和岩浆,流体性质以低温、低盐度为特点。该区成矿特征具有很好的普遍性,加强对该区的研究对其他矿区的找矿具有一定的指导意义。

The Jiawu deposit is located in the Nanshan micro - geosyncline belt within Qinghai, adjacent to the junction of East-ern Kunlun belt and Western Qinling belt. The stratum in the deposit area consist of a suite of shore to shallow sea facies of turbiditic sandstone. The fine grain argillaceous slate and carbonaceous slate in the stratum are closely associated with the mineralization. The ore bodies mostly occur in the interlayer fracture zone within the carbonaceous slate. The main mineral association is pyrite and arsenopy- rite. The ore - forming fluid is mostly derived from the country rock and magma, the fluid dominated with low temperature and low sa- linity. The metallogenic characteristics is very common in the deposit area, it is very useful for exploring the deposit in other areas through the detailed studies of this deposit.