藏东马牧普地区斑岩型铜金银多金属矿化带地球化学异常评价

Geochemical anomaly evaluation of porphyry-type Cu-Au-Ag polymetallic mineralization zone of Mamupu,eastern Tibet

藏东玉龙成矿带马牧普地区1:5万水系沉积物中的成矿元素Au、Ag、Cu、Pb、Zn的研究,采用分形方法确定异常下限,得出其异常下限值分别为10×10-9、0.48×10-6、75×10-6、120×10-6、130×10-6;用因子分析研究成矿元素的异常组合规律,指出测区西南异常区为Au、Cu、Pb、Zn、Ag组合异常,是矿致异常;中西部异常为Ag、Cu、Pb、Zn综合异常,为指示斑岩分散流的异常,是非矿致异常。

By researching ore-forming elements Au, Ag, Cu, Pb, Zn in 1：50 000 stream sediment survey in Mamupu, eastern Tibet where is in Yulong mineralizatin zone, the authors used fractal method to determine their low-limit anomaly, which are respectively 10×10^-9,0.48×10^-6,75×10^-4、120×10^-4、130×10^-6. Factor analysis was used to study anomaly association ralationship among ore-forming elements. It is shown that the southwest anomaly region is the composite anomaly of Au, Cu, Pb, Zn and Ag and belongs to one ore-caused anomaly; the mid-west anomaly region is the common anomaly of Ag, Cu, Pb, Zn, indicative of dispersion trains of porphyry, but not one ore-caused anomaly.