Sediment Recycling and Indication of Weathering Proxies
As a result of sedimentary recycling,the mineralogical and chemical compositions of riverine sediments may reflect the combined effects of the present-day weathering regime as well as the previous weathering and diagenetic alteration history.River sediments can be interpreted as a mixture of non-weathered bedrock,either of igneous,metamorphic or sedimentary origin,and solids formed by modern weathering system.The correlation between weathering proxies of CIA(chemical index of alteration)and WIP(weathering index of Parker)offers an approach to distinguish the fine suspended particles,coarse bedload sediments,and recycled sediments under the influence of quartz dilution.Recycling of cation-depleted source rocks formed during past geological weathering episodes may have great impacts on the weathering indices of sediments from the Changjiang(Yangzte)and Zhuoshui River in Taiwan.Special caution is required when chemical weathering indices are used to investigate the intensity of chemical weathering registered in fluvial sediments.To minimize the effect of hydrodynamic sorting or sedimentary recycling,we suggest that the fine sediments(e.g.suspended particles and <2 μm fractions of bedload sediments)in rivers can better reflect the average of weathered crust in catchments and the terrigenous end-member in marginal seas.
River sediments Weathering indices Sediment recycling Source-to-sink
Yulong Guo Shouye Yang Chao Li Lei Bi Yun Zhao
State key Laboratory of Marine Geology,Tongji University,1239 Siping Road,Shanghai 200092,P R China State key Laboratory of Marine Geology,Tongji University,1239 Siping Road,Shanghai 200092,P R China;
国际会议
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)
贵阳
英文
1-4
2017-06-11（万方平台首次上网日期，不代表论文的发表时间）