青海省东昆仑中段地区构造地球化学特征及地质意义

青海省境内的东昆仑中段地区,地质研究程度低,根据已经完成的1∶50万地球化学调查资料,结合地质背景,对该区构造单元和深大断裂带的地球化学特征进行分析。从元素特征参数值入手,总结出各构造单元中地球化学元素的分布特征及该地区地壳演化的基本规律,并将本区划分为7个地球化学异常区带。研究表明,昆中断裂带具有中高温元素矿化,昆南断裂带具有低温元素矿化,而且沿其断裂带两侧分别形成金—铜与金—锑为主的多金属成矿区带。通过不同构造单元的含矿性对比,指出由北向南形成由Cu、Cd、Fe、Au、Pb、Zn、Ag、W、Sn—Au、As、Sb、Cu( Co)、Pb、Zn—Au、Sb、As、Hg( Cu、W、Sn)的成矿区带。

Tectonic geochemistry of the central segment of the East Kunlun Mountains in Qinghai Province and its geological significance

Geological survey in the middle part of East Kunlun Mountains is very insufficient. Based on geochemical information of 39 elements and oxides acquired by the scale 1 ∶ 500,000 regional geochemical exploration, this paper deals with the geochemical charac?teristics of different tectonic units and major fault structures, combined with geological background. According to the parameter values of the elements,this paper sums up the elements distribution of different tectonic units and the basic law of earth crust evolution,and classifies groups of elements anomalies into seven elements geochemical anomaly zones in the region. Different fault structures have dif?ferent geochemical characteristics, i.e., high?temperature ore?forming elements occur in Kunzhong faults whereas low?temperature met?allogenic elements exist in Kunnan faults, so that the most important Au?Cu and Au?Sb polymetallic belts lie on both sides of Kunzhong faults and Kunnan faults zones. The mineralization in the different tectonic units shows different features from the north to the south,i. e., the elements evolved in order of Cu, Cd, Fe, Au, Pb, Zn, Ag, W, Sn?Au, As, Sb, Cu (Co), Pb, Zn?Au, Sb, As, Hg (Cu, W, Sn) southward.