摘要
依托大场大型金矿床对青海省高寒草甸区西部的表生地球化学作用进行了研究,发现风成沙集中在-40～+160目粒级段,富含SiO2,而绝大多数元素的含量均很低;-20目残坡积土和-5～+20目草皮层土富集或基本富集了大部分金矿化指示元素,均可代表近源物质。从基岩→残坡积层→草皮层→水系沉积物,金矿化主要指示元素Au、As、Sb的平均含量在逐步降低,其他元素也多如此。在高寒准平原—丘陵区,地表存在着元素(特别是Au、As、Sb)被不同程度贫化或均一化的地球化学作用。
Backed by the large-size Dachang Gold Deposit, the authors made a preliminary study of the supergene process in the western part of the cold and high meadow area in Qinghai Province.It has been found that eolian sands are concentrated in - 40 ~ +160 mesh and rich in SiO 2,while contents of most elements are very low.Most of the indicator elements for gold deposits are basically concentrated in residual soil and clinosol of -20 mesh and meadow surface soil of -5～+20 mesh,representing proximal sediments.The contents of the gold indicator elements Au,As and Sb tend to decrease in order of bedrock→residual and slope sediments→meadow surface soil→stream sediments,and things are similar for other elements.All this indicates that there exist geochemical processes of impoverishment or homogenization of elements,especially Au,As and Sb,on the surface of cold and high land peneplain-hilly landscape.
出处
《物探与化探》
CAS
CSCD
2005年第3期194-200,共7页
Geophysical and Geochemical Exploration
基金
原地质矿产部青海省高寒草甸区化探异常查证方法研究项目(地科定9818)
关键词
青海省
高寒草甸区
表生地球化学作用
Qinghai Province
cold and high meadow area
supergene geochemical process
