Spatiotemporal Variations of Elements in Hydrogenic Sediments,Watershed Weathering and its Driving Mechanism in the upper Golmud River
The weathering and migration of elements in the sediments in the middle and upper reaches of Golmud River catchment is of great significance to the replenishment of salt resources in Qarhan Salt Lake.In this paper,the formation ages of Nachitai(NCT)and Xiaogangou(XGG)profiles in the Golmud River catchment and the variation of some major and trace elements were studied,and the element characteristics of different sediment types in the upper and lower reaches of the catchment were compared and analyzed,and the conclusions are as follows:(1)Since the last lnterglacial period,the major elements in the sediments of the middle Golmud River valley are higher than those in the upper Xidatan and Kunlun River sub-basins,showing an obvious enrichment state.(2)The degree of weathering of the sediments in the wet and cold foothills in the upper reaches of the catchment is significantly higher than that in the hot and dry valleys of the middle reaches,indicating that the meltwater of glaciers,abundant precipitation and strong water-rock reaction process in the upper reaches are the main factors influencing the weathering of the catchment,and the material transport among the sub-basins of the basin has the characteristics of jumping,transferring and inheriting.(3)The weathering process in the catchment is closely related to the glacial-interglacial climatic cycles and monsoon-westerly interactions since the late Pleistocene,that is,the warm and wet stages is mainly controlled by monsoon,and chemical weathering.The dry and cold stage is subject to westerly control,and physical weathering dominates.In conclusion,the weathering and migration of elements in the foothills of the upper reaches of Golmud River catchment,and the inheritance and transfer of elements in the sediments of the middle reaches of Golmud River catchment are the main forms of material flow in the drainage basin.
Golmud River catchmentElement migrationChemical weatheringMonsoon westerly transformation
NETL
NSTL
万方数据
维普
