西藏改则县木如地区岩屑地球化学分析

Geochemical Analysis of Rock Debris in Muru Area,Gerze County,Tibet

利用木如地区1∶1万岩屑地球化学测量数据,运用因子分析等多种统计方法,研究该地区地球化学特征,共划分出Sb-Pb-Ag、Cu-Zn-Bi-As、W-Au-Mo 3个元素组合,绘制因子得分等值线图,并在此基础上探讨找矿方向,缩小了找矿靶区。结合该地区地质特征认为:与该地区金成矿有关的成矿热液应该为岩浆热液,具有沿着北东向断裂,由南西向北东运移的趋势;在木如地区除了寻找与金矿体外,还有寻找与岩浆热液有关的Cu-Zn矿体的潜力。

According to the geochemical data of debris at 1：10 000 in Muru area, the multivariate statistics methods,like the factor analysis method is applied to investigate the geochemical characteristics of this area. Three element groups are marked out：Sb-Pb-Ag, Cu-Zn-Bi-As and W-Au-Mo. Furthermore,the contour plot of the factor score is drawn. Based on this, the prospecting direction is discussed so as to narrow the range of prospecting target. The geological features of this area indica- ted that the ore-forming fluid which is related to the gold mineralization sources from magmatic hydrotherm, and migrated from southwest to northeast along the NE trending fault. Besides discovering the gold ore bodies, there is the prospecting potential for finding the magmatic-hydrothermal related Cu-Zn ore bodies in the Muru area.