Geochemistry and provenance of bed sediments of the large rivers in the Tibetan Plateau and Himalayan region

We investigated the geochemical characteristics of major, trace and rare earth elements and Sr–Nd isotope patterns of bed sediments from the headwaters and upper reaches of the six large rivers draining the Tibetan Plateau (the Jinsha River—Yangtze, Lancang River—Mekong, Nujiang River—Salween, Huang...

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Bibliographic Details
Published in:International journal of earth sciences : Geologische Rundschau 2012-07, Vol.101 (5), p.1357-1370
Main Authors: Wu, Weihua, Zheng, Hongbo, Xu, Shijun, Yang, Jiedong, Yin, Hongwei
Format: Article
Language:English
Subjects:
Basalt
Carbonate rocks
Cenozoic
Earth and Environmental Science
Earth Sciences
Fluvial sediments
Geochemistry
Geology
Geophysics/Geodesy
Headwaters
Lithology
Mineral Resources
Original Paper
Permian
Rare earth elements
River catchments
Rivers
Sediment transport
Sedimentology
Structural Geology
Volcanic rocks
Weathering
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Summary:We investigated the geochemical characteristics of major, trace and rare earth elements and Sr–Nd isotope patterns of bed sediments from the headwaters and upper reaches of the six large rivers draining the Tibetan Plateau (the Jinsha River—Yangtze, Lancang River—Mekong, Nujiang River—Salween, Huang He—Yellow, Indus, and Yarlung Tsangpo—Brahmaputra). By using Ca/Al versus Mg/Al, La/Sc versus Co/Th, and 87 Sr/ 86 Sr versus ε Nd (0) binary differentiation diagrams of provenance, some typical contributors to the different catchment sediments can be identified. In the Three-River (the Jinsha, Lancang, and Nujiang Rivers) tectonomagmatic belt, acidic–intermediate-acidic volcanic rocks are very important provenance of sediments. Carbonate rocks and Permian Emeishan basalts are dominant in the Jinsha River. The Yellow River sediments have similar geochemical characteristics with loess in catchments. The Indus and Yarlung Tsangpo Rivers sediments are mainly from ultra-K volcanic rocks and Cenozoic granitoids widely distributed in the Indus–Yarlung suture. The intensity of chemical weathering in these river catchments is evaluated by calculating the chemical indices of alteration (CIA) of sediments and comparing them with bedrocks. The CIA values of the six river sediments are from 46.5 to 69.6, closing to those of bedrocks in the corresponding catchment, which indicates relatively weak chemical weathering intensity. Lithology, climate, and topography affect the chemical weathering intensity in these river catchments.
ISSN:1437-3254
1437-3262
DOI:10.1007/s00531-011-0719-2