以扎木曲多金属矿为例浅谈地球化学勘查在唐古拉山地区找矿的有效性

扎木曲多金属矿位于唐古拉山北坡,长江源头的沱沱河一带。1/20万地球化学测量在该区圈定AS4甲1HgCu综合异常一处,对该综合异常作1/5万水系沉积物加密测量,将其分解为AS4-1~AS4-5五个子异常,进一步浓缩了找矿靶区。对分解后的重点子异常AS4-3采用土壤测量控制异常浓集中心部位,圈定了一条土壤元素组合异常带,异常重现性好,面积大,元素含量值显著提高。通过对土壤异常带作工程验证并圈出铅矿体9条。为此,地球化学勘查在本区寻找多金属矿是行之有效的,这为在唐古拉山地区寻找多金属矿产提供参考。

A brief analysis on effectiveness of geochemical prospecting in Tanggula Mountains area based on an example of Zhamuqu polymetallic deposit

Zhamuqu polymetallic deposit locates at northern slope of Mountain Tanggula,Tuotuo River area which is headstream of Yangtze River.The 1/200000 geochemical survey defines a composite anomaly AS（4/A1）HgCu in this area.This composite anomaly is divided into 5 sub-anomalies which are named respectively as AS4-1,AS4-2,AS4-3,AS4-4 and AS4-5 by means of 1/50000 stream sediment infill survey in order to narrow down the prospecting target area.In respect to the primary sub-anomaly AS4-3 soil survey is adopted to control the central part of anomaly concentration,thus a soil element composition anomaly belt is blocked out with high anomaly repeatability and large scale and obviously increased element content.After engineer-ing verification,9 lead ore-bodies are blocked out in the soil anomaly belt.Therefore,it is concluded that ge-ochemical prospecting is effective and referential in looking for polymetallic deposit in this area.