青海五道梁地区渐新统雅西错组地球化学特征及成矿作用浅析

以五道梁地区1∶20万水系沉积物测量更新数据为基础,以渐新统雅西错组为研究对象,利用地层汇水域水系沉积物测量元素原始数据进行了参数统计,通过相对丰度、R型聚类分析和因子分析,分析了地层中各元素的含量分布特征及元素间的亲疏关系,进一步浅析了地层在成矿中的作用.认为雅西错组高钙碳酸盐岩建造环境显著,Ba、Sr、Ag、As、Cd、Mo在地层中有不同程度的富集.地层有一定的含矿性,其中Ag趋向于与黏土岩伴随的硅质砂岩类中,其他在碳酸盐岩中.在后期岩浆热源作用下,主要成矿元素能进一步富集成异常或成矿.

Analysis of Geochemical Characteristics and Mineralization of Oligocene Yaxi lake Formation in Wudaoliang Area,Qinghai Province

This article discusse Oligocene Yaxi lake Formation based on the up data of Wudaoliang area 1∶200000 stream sediment surveys.We have got the parametric statistics from original data of elements of stream sediment surveys.Through relative abundance,R type cluster analysis and factor analysis,it analyses the content distribution characteristics of each element and the relationship among elements in strata,it gave a further explanation in strata metallogenesis.It was considered that Yaxi lake Formation had a significant high calcium carbonate rock built environment,and Ba,Sr,Ag,As,Cd,Mo had different degrees of enrichment.Strata have ore-bearing property,among them Ag distributes in silicon sandstone,others in carbonate rock.Under the effect of magma heat source,the main ore-forming elements could enrich further to unusual or formed ore.