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Clay Mineralogy of Surface Sediments in the Three Gorges Reservoir: Implications for Sediment Provenances and Weathering Regimes

Published online by Cambridge University Press:  01 January 2024

Shuai Wang
College of Earth Sciences and Engineering, Jiangning Campus of Hohai University, Nanjing 211100, China
Wenbo Rao*
College of Earth Sciences and Engineering, Jiangning Campus of Hohai University, Nanjing 211100, China
Jin Qian
College of Environment, Gulou Campus of Hohai University, Nanjing 210098, China
Mengying He
School of Geography Science, Nanjing Normal University, Nanjing 210046, China
Changping Mao
College of Earth Sciences and Engineering, Jiangning Campus of Hohai University, Nanjing 211100, China
Kun Li
College of Environment, Gulou Campus of Hohai University, Nanjing 210098, China
Yuexing Feng
Radiogenic Isotope Facility, The University of Queensland, Brisbane, QLD 4072, Australia
Jianxin Zhao
Radiogenic Isotope Facility, The University of Queensland, Brisbane, QLD 4072, Australia
*E-mail address of corresponding author:


Knowledge of clay mineralogy is essential for understanding the source areas and weathering environments of fluvial sediments, particularly in large reservoirs facing serious problems with sediment deposition, such as the Three Gorges Reservoir (TGR) in east-central China. The purpose of the present study was to identify the sediment provenances and weathering regimes contributing to the sediment load in the TGR by determining the clay-mineral and geochemical compositions of surface sediments during various seasons. X-ray diffractometry and scanning electron microscopy (SEM) were used to identify the clay minerals. The results showed that illite was the dominant mineral, followed in order by kaolinite, chlorite, and montmorillonite. From a mineralogical perspective, distal sources were the main contributors to the TGR sediments, and regional sources (surrounding tributaries) also contributed much during the three seasons, while proximal sources (hillslope soils) supplied sediment in the flood season but not in the other two seasons. The geochemical and hydrological data generally supported the mineralogical results. In the flood season, the chemical indices of the TGR sediments were >0.4, showing that the sediments contained Al-rich illite minerals and experienced intense hydrolysis. In the other two seasons the TGR sediments were enriched in Fe- and Mg-rich illite minerals, resulting from strong physical weathering. Furthermore, precipitation, rather than air temperature or latitude, was the factor that controlled weathering intensity. These findings provide deep insights into the sediment cycle and chemical weathering in this large reservoir basin.

Copyright © The Clay Minerals Society 2020

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