QUANTITIVELY PARTITION OF EOLIAN AND HYDROMORPHIC COMPONENTS IN LACUSTRINE SEDIMENTS:AN EXAMPLE FROM LAKE QINGHAI

This paper reports a cluster analysis on sources of Lake Qinghai sediments,and a grain-size analysis on the surface sediments of Lake Qinghai and its adjacent typical aeolian loess Based on the results,we have fitted the typical grain size distributions of the lake sediments and evaluated the proportions of eolian and fluvial components by using the grain size distributions of given end members,i.e.,taking the aeolian loess sediments around the lake as eolian end-member and the surface lake sediments as fluvial end-member.The fitting result shows that the grain size distributions of Lake Qinghai sediments can be grouped into three types: 1) dominated by fluvial components;2) dominated by eolian components(aeolian loess);3) mixture of both with different proportions.It is hopeful that this method will provide a new way for quantitively partition of different components in lake sediments and for understanding of paleoenvironment.in the future researches.