汞在地壳、岩石和疏松沉积物中的分布

Abundance of mercury in crust,rocks and loose sediments

20世纪80年代以来分析测试技术取得了突破性的进展,积累了汞在岩石和疏松沉积物大量可靠的分析数据,发现引用20世纪70年代前发表的有关汞的地壳丰度及岩石和沉积物中的平均含量作为衡量标准已不适宜。本文根据近20年来发表的有关汞在地壳、岩石和疏松沉积物中含量的文献,结合作者在地壳元素丰度研究中积累的大量岩石中汞含量的可靠数据以及IGCP360“全球地球化学基准”计划获得的国外沉积物中汞含量的可靠数据,综合给出了汞在地壳、出露岩石地壳的丰度分别为7ng/g和13ng/g,岩石、火成岩、沉积岩、变质岩的平均含量分别为12.5ng/g、6.9ng/g、22.6ng/g和8.6ng/g,大陆疏松沉积物、水系沉积物、泛滥平原沉积物、土壤和浅海沉积物的平均含量分别为60ng/g、60ng/g、60ng/g、65ng/g和25ng/g。

The mercury abundance in crust,rock s and loose sediments is an important parameter in geochemistry.Along with the breakthrough of the an alytical techniques of mercury in 1980s and the accumulation of a huge amount of reliable analytical data o f mercury at present,it is found that it is not suitable now to quote the mercury abundance in crust,rocks and loose s ediments published before 1970s as evaluating criterion.According to the literatures about the mercury conte nts in crust,rocks and loose sedimen ts published in recent twenty years a nd a huge amount of reliable analytical d ata in the study about crust and rocks accumulated,as well as the mercury contents in flood plain sediments in Kazakhstan,Colombia,and Brazil in IGCP 360“Global Geochemical Baseline”project,it is recommended that the mercury abundance in the crust and in t he exposed crust are 7and 13ng /g,the average contents of mercury in rocks,igneous rocks,sedimentary rocks a nd metamorphic rocks are 12.5,6.9,22.6and 8.6ng /g,those in continent al loose sediments,stream sediment s,flood plain sediments,soils and shallow-sea sediments are 60,60,60,65and 25ng /g,respectively.These greatly improve the mercury abun-dance in the crust,rocks and loose se diments,and these have an immense pr actical meaning for theory geochem-istry,exploration geochemistry,e cological geochemistry and environ mental geochemistry.