辽宁水系沉积物元素丰度及典型矿区地球化学特征

利用区域化探成果,论述和探讨了37种元素在辽宁省全域及各地质子区水系沉积物中的分布与分配特征及省内7种类Au、Cu、Pb、Zn典型矿区地球化学特征。研究结果表明:辽宁省景观地球化学标型元素是Al(强烈富集)和Ca(大量流失),出露地表的岩石以遭受化学风化作用为主;组成重砂矿物的微量元素(亲铜和亲铁元素)在水系沉积物中趋于富集;早前寒武纪变质岩石是Au、Cu、Pb、Zn、B元素最重要的矿源层,蓟县纪地层富含Au、As、Sb、Bi等元素,是寻找浸染型金矿的有利层位;排由楼金矿区元素组合特征与太古界相似,该区可能一直处于相对封闭体系。

ABUNDANCE OF ELEMENTS IN STREAM SEDIMENT AND GEOCHEMICAL FEATURES OF TYPICAL MINING AREAS IN LIAONING

Based on the data of the regional geochemical exploration in Liaoning,the distribution characteristics of 37 elements in the stream sediment have been discussed for the whole province and all geologic subregions.The regional geochemical features of the 7 kinds of Au,Cu,Pb,Zn typical mining areas in Liaoning also have been studied in detail. The results suggest that the typochemical elements are Al(intense enrichment) and Ca (heavy dilution) in Liaoning geochemical landscape;the chemical weathering is primary agent for the surface rock in Liaoning province;the trace elements(chalcophile and siderophile elemets)in placer minerals tend to relatively enriching in stream sediment;the distribution of elements in stream sediment that comes from rock waste is more uniform than in bedrock;early Precambrian metamorphic rocks are most important source bed of Au,Cu, Pb, Zn, B; stratum of Jixian system rich in Au,As,Sb,Bi is advantageous to searching for disseminated gold deposits; the distribution features of elements,of the Paishanlou gold mining area is similar to Archaeozic Erathem in Liaoning,it may be in a relative closed system up to now.