青海省都兰县五龙沟-高地地区水系沉积物地球化学特征及找矿远景

Geochemical Characteristics of Stream Sediments in the Wulonggou-Gaodi area, Dulan County, Qinghai Province and Their Exploration Prospective

在1∶50000水系沉积物测量的基础上,对青海省都兰县五龙沟-高地地区的地球化学特征进行了初步研究。运用元素的区域浓集系数、元素富集离散特征对研究区水系沉积物测量的9种微量元素进行了地球化学统计分析,讨论了9种微量元素的分布规律,推断出Zn、Pb、Au、Mo 4种元素具有较大的成矿潜力。并通过多元统计分析确立了测区内元素的组合特征,划分出高-中-低温3组成矿元素组合(即Sn-Bi,Cu-Pb-Zn-Mo,As-Sb-Au),运用组合衬值异常法("平方和加根号"模式)在区内圈定组合异常,这些异常均具有高中低温的分带特点。结合地质和矿化特征,圈出3个找矿远景区,为下一步在该区寻找Pb、Zn等多金属矿提供理论依据。

On the basis of 1∶50000 stream sediment survey,the geochemical characteristics of stream sediments in the Wulonggou-Gaodi area in Dulan County,Qinghai Province have been preliminarily studied in this paper.The geochemical statistical analysis of data for 9 kinds of trace elements of the stream sediments in the study area has been carried out by using the regional concentration coefficient of elements and characteristics of the element enrichment and dispersion.The distribution regularity of 9 kinds of trace elements has been discussed.It is proposed that the 4 elements of Zn,Pb,Au and Mo had relatively great metallogenic potential.The characteristics of element assemblages in the survey area are established through the multivariate statistical analysis.Three assemblages of high-medium-low temperature metallogenic elements(namely Sn-Bi,Cu-Pb-Zn-Mo,and As-Sb-Au)are classified.The combined anomalies are outlines by using the"square sum sign"anomaly method.The anomalies are characterized with zoning of high,medium and low temperature elements.Combined with geological and mineralization characteristics,three prospecting targets have been outlines in the study area,providing a theoretical basis for further exploration of Pb,Zn and other polymetallic resources in the area.