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- W2017041819 abstract "Bank sediments and suspended loads of the Brahmaputra River and its important tributaries were collected from the Himalayan front to Bangladesh along with most of the important tributaries. Chemical and isotopic compositions of the sediments are used to trace sediment provenance and to understand erosion patterns in the basin. Overall isotopic compositions range from 0.7053 to 0.8250 for Sr and ϵNd from −20.5 to −6.9. This large range derives from the variable proportions of sediments from Himalayan formations with high Sr isotopic ratios and low ϵNd, and Transhimalayan plutonic belt with lower Sr isotopic ratios and higher ϵNd. The latter are exposed to erosion in the Tsangpo and in the eastern tributary drainages. Overall erosion of the Himalayan rocks is dominant, representing ca 70% of the detrital influx. Compositions of the Brahmaputra main channel are rather stable between 0.7177 and 0.7284 for Sr and between −14.4 and −12.5 for ϵNd throughout its course in the plain from the Siang-Tsangpo at the foot of the Himalayan range down to the delta. This stability, despite the input of large Himalayan rivers suggests that the Siang-Tsangpo River represents the major source of sediment to the whole Brahmaputra. Geochemical budget implies that erosion of the Namche Barwa zone represents about 45% of the total flux at its outflow before confluence with the Ganga from only 20% of the mountain area. Higher erosion rates in the eastern syntaxis compared to the other Himalayan ranges is related to the rapid exhumation rates of this region, possibly triggered by higher precipitation over the far-eastern Himalaya and the high incision potential of the Tsangpo River due to its very high water discharge." @default.
- W2017041819 created "2016-06-24" @default.
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- W2017041819 date "2002-09-01" @default.
- W2017041819 modified "2023-10-14" @default.
- W2017041819 title "Tracing the distribution of erosion in the Brahmaputra watershed from isotopic compositions of stream sediments" @default.
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- W2017041819 doi "https://doi.org/10.1016/s0012-821x(02)00822-1" @default.
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