青海鄂拉山地区水系沉积物地球化学特征及找矿方向

Geochemical Characteristics of Stream Sediments and Prospecting Direction in Elashan Area in Qinghai Province

摘要:

为了研究青海省鄂拉山地区找矿远景，基于该区最新一轮1∶5万水系沉积物测量数据，提炼分析其地球化学特征之元素分布特征、元素组合特征、元素异常特征，认为该区主要成矿元素为W,Sn,Mo,Bi,Ag,Cu,Pb,Zn,Au,Sb；并指出该类成矿元素多在元古宙和古生代的地层中明显富集；主要成矿类型为矽卡岩型和热液充填型。结合已知成矿地质条件，最终优选出4个找矿远景区，为该区域提供了较明确的找矿方向。

Abstract:

In order to study the prospects in Elashan area of Qinghai province，based on the latest stream sediment survey data with the scale of 1∶50000， and the study on characteristics of element distribution, assemblage and anomaly，it is regarded that major ore forming elements in this area are W, Sn, Mo, Bi, Ag, Cu, Pb, Zn, Au and Sb. It is pointed out that these ore forming elements are usually concentrated in Proterozoic and Paleozoic strata obviously, and major ore forming types are skarn type and hydrothermal vein type. Combining with the already known geological condition of mineralization，4 areas with good ore prospects have been selected. It will provide clear suggestions for the further prospecting work in this area.