1∶5万、1∶2.5万地球化学异常在青海都兰小庙地区地质找矿的指示意义

Geological Prospecting Significance of 1 ∶50 000, 1 ∶25 000Geochemical Anomaly of Dulan Xiaomiao area in Qinghai

青海都兰小庙地区位于柴达木盆地东南部,北昆仑岩浆弧,区内涉及2处1∶5万水系沉积物异常、10处1∶2.5万地球化学异常,异常元素以W、Sn、Mo、Bi、Pb为主,相同位置不同比例尺的化探异常,元素对异性、重显性较好,特别是主要成矿元素W、Sn、Mo,浓集中心明显,异常强度大,通过对区内1∶5万、1∶2.5万地球化学异常之间关系分析及异常所处地质成矿条件综合分析,良好的地球化学异常是找矿的有力依据,区内寻找矽卡岩型锡多金属矿是区内找矿的主攻方向,对区内下步找矿方向具有较好指示意义。

Located in the southeast of Qaidam Basin and the northern Kunlun magmatic arc,Dulan Xiaomiao area of Qinghai Province involves 21∶50,000 stream sediment anomalies and 101∶25,000 geochemical anomalies.The abnormal elements are mainly W,Sn,Mo,Bi and Pb.The geochemical anomalies of different scales in the same location have good element pairs and heavy dominance.In particular,the main ore-forming elements W,Sn and Mo have obvious concentration and strong anomaly intensity.In an analysis of the relationship between 1∶50,000 and 1∶25,000 geochemical anomalies in the area and our comprehensive analysis of the geological and metallogenic conditions of the anomalies,we have found that the good geochemical anomalies are a strong basis for prospecting.The main direction of prospecting is to search for skarn type tin polymetallic ore in the area.It has good indicative significance to the next prospecting direction in the area.