Comparing the Time Scale of Sediment Source-to-sink Processes in the Major East Asian River Basins

摘要：

　　Knowledge of sediment source-to-sink process leads to a better understanding of continent weathering and terrigenous input to the ocean.However,the time scale of this process is hard to determine because of the complex sediment transferring induced by hydrodynamic and topographic factors.The comminution age theory corresponds well with the sediment source-to-sink processes and can be quantitatively determined by 234U/238U disequilibrium.This study provides comminution age calculation for sediments from the Huanghe(Yellow River)river.The result shows that the comminution ages for fine lithogenic fraction of the Huanghe sediments mainly range from 200 to 400 kyrs,and close to those in the Changjiang sediments.It reveals that the time scale of sediment source-to-sink processes in East Asia may be topography-dependent and is distinguished from that in the South Asian river(e.g.the Ganges River)which is less than 100 kyrs.This study overall offers an important attempt of quantitative constraint on sediment source-to-sink processes from the largest two rivers in East Asia and may shed a new light on comparing the mechanisms of sediment transfer processes from Tibetan Plateau to East Asia and South Asia.

关键词： 234U/238U activity ratio Comminution age Changjiang and Huanghe Sediment source-to-sink processes

作者: Chao Li Shouye Yang Yulong Guo Lei Bi Jian-xin Zhao

作者单位: State Key Laboratory of Marine Geology,Tongji University,Shanghai 200092,P.R.China State Key Laboratory of Marine Geology,Tongji University,Shanghai 200092,P.R.China;Laboratory for Ma Radiogenic Isotope Facility,School of Earth Sciences,The University of Queensland,Brisbane,QLD,4072,

会议类型: 国际会议

会议名称: The 11th International Symposium on Geochemistry of the Earths Surface(GES-11)(第十一届地球表层地球化学国际研讨会)

会议地点: 贵阳

会议语种:英文

页码: 1-3

在线出版日期: 2017-06-11（万方平台首次上网日期，不代表论文的发表时间）