三江北段地球化学分区及特征

Geochemical subares of the northern part of anjiang area and their characteristics

青海三江北段成矿带是指我国著名的西南三江成矿带的北延部分,是地质找矿最具潜力的地区之一。笔者将三江北段划分了3个地球化学区,即西金乌兰-玉树地球化学分区、沱沱河-杂多地球化学分区、雁石坪地球化学分区,分析了它们的特点。沱沱河-杂多地球化学分区Pb、Zn、As、Sb、Mn、Cd、Nb、Sr等元素表现为富集;各地球化学分区主要成矿(相关)元素排序方式表明Pb、Zn、Cd、As、Sb、Mn、Cu、Ag、Mo、Fe等元素不但处于明显富集状态,而且分布极不均匀,形成了三江北段内特定的元素组合。地球化学分区为该区的找矿方向、成矿远景评价及基础地质调查奠定了基础。

The northern part of the Qinghai Sanjiang metallogenic belt refers to the northern extension of the southwestern Sanjiang metallogenic belt,which is one of the most promising areas of geological prospecting.It is divided into three geochemical zones,namely Xijir Ulan-Yushu geochemical subdivision,Tuotuohe-Zadol geochemical subdivision and Yanshiping geochemical subdivision.Plumbum,Zn,As,Sb,Mn,Cd,Nb,Sr are enriched in Tuotuohe-Zadol subdivision,and the major mineralization(related)elements sorting orders of the three geochemical subdivisions indicate that Pb,Zn,Cd,As,Sb,Mn,Cu,Ag,Mo,Fe are not only obviously enriched,but also are very unevenly distributed,forming aparticular element association within the northern part of the Sanjiang region.Geochemical zoning laid a good foundation for the prospecting direction,metallogenic prospect evaluation and basic geological survey of the area.