青海省同德县加吾金多金属矿区微量元素在地质体中的分布特征

青海省同德县加吾矿区处在东昆仑-西秦岭衔接部位的青海南山冒地槽带。区内地层以中三叠统隆务河群为主,构造以NNW向压扭性断裂为主,除曲如沟花岗闪长岩体外,其余以花岗斑岩脉产出。区内除Cr、Mo外,大部分元素较为富集,其中Au、As、Sb、Bi、Ag富集程度较高,尤其在破碎带、褐铁矿化石英脉和花岗斑岩脉中,Au、As、Sb、Bi、Pb等元素的含量比其余几种岩性高1-3个数量级。通过因子分析和建立地球化学模式图,客观的反映了区内各地质体中微量元素的分布规律。

Trace element distribution in geological body in Jiawu mine, Tongde county, Qinghai province

Jiawu mine of Tongde county Qinghai province is located in Nanshan miogeosyncline belt Qinghai at the joining part of east Kunlun-West Qinling structure zone.The strata in the region is predominated by middle Triassic Longwuhe group,with mostly NNW striking compressional torsion structure;except for Qurugou granitic diorite rock body,all the rock mass occur in the form of granite porphyry dike.Except for Cr and Mo,most elements are relatively enriched,with Au,As,Sb,Bi,Ag much accumulated,especially in crash zone and limonite polluted quartz vein and granitic porphyry dike,the content of Au,AS,Sb,Bi,Pb is 10 to 1000 times as high as the other several kinds of lithology.Factor analysis was done and the geochemical model is established,realistically reflecting trace element distribution rule in different geological bodies in the area.