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Clay minerals in the major Chinese coastal estuaries and their provenance implications |
Chunyan MA1, Jing CHEN2( ), Yuanjun ZHOU1, Zhanghua WANG2 |
| 1. Department of Geography, East China Normal University, Shanghai 200062, China; 2. The State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China |
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Abstract A sea-survey was carried out along the Chinese coast from the Bohai Sea to South China Sea, and 15 surficial samples were taken from major coastal estuaries, i.e., from north to south, the Yellow, abandoned Yellow, Yangtze, Qiantang, Ou, Min, Han, and Pearl River estuaries. On the basis of clay mineral analysis and published data collection, this paper discusses the characteristics of clay minerals of each coastal river and potentials of implications of sediment sources. The results show that the change of diagnostic clay minerals from smectite to kaolinite from the Yellow to the Pearl River estuaries is southward, as clearly shown by the ratios of smectite to chlorite (S/Ch) and kaolinite to illite (K/I). S/Ch decreases southward, while K/I moves reversely, implying change in climate setting from cool/dry to humid/hot with intensified weathering processes. Besides, these two indicators in the estuaries are also linked with the derivation of parent-rock of each river-basin and coastal hydrodynamics. The disproportional higher ratio of K/I in the Yellow and abandoned Yellow River estuaries is ascribed to their sediment sources with abundant loess component in the north-central China. The K/I decrease offshore from the Pearl River estuary is primarily due to hydrodynamic sorting. Therefore, the S/Ch and K/I of the present study comprehensively reflect the controls of climate, parent-rock, and sediment transport along the coast.
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| Keywords
climate setting
clay minerals
Chinese estuaries
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Corresponding Author(s):
CHEN Jing,Email:jchen@geo.ecnu.edu.cn
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Issue Date: 05 December 2010
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