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    Investigations of the spatial and temporal variations of Sr and Nd isotopes in sediments from two Indian Rivers: Implications to source identification

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    Date
    2017
    Author
    Pradhan, S.
    Zhang, J.
    Baskaran, M.
    Shirodkar, P.V.
    Wu, Y.
    Pradhan, U.K.
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    Abstract
    Radiogenic isotopes of Sr and Nd provide crucial information on chemical and physical erosion processes, therefore used as tracers for fingerprinting the sources of fluvial sediments. Moreover, elemental geochemistry, 87Sr/86Sr and 143Nd/144Nd signatures in silicate fractions of sediments primarily reflect intricate controls of characteristics and provenance of sediment. A suite of sediment samples collected from two rivers of India, Narmada (large) and Netravati (small) were analyzed for elemental concentrations, 87Sr/86Sr and 143Nd/144Nd in silicate as well as acid?leachable fractions. 87Sr/86Sr in acid?leachable sediment fractions from both the rivers (0.7094?�?0.0002 for Narmada and 0.7158?�?0.003 for Netravati) showed more radiogenic 87Sr/86Sr in Netravati compared to Narmada indicating influence of source rocks in their watersheds. Weak correlation of sedimentary 87Sr/86Sr and 143Nd/144Nd with Al and Chemical Index of Alteration (CIA) in silicate fraction indicates that isotopic compositions are primarily controlled by their sources and not by chemical weathering in both the rivers. Provenance of sediments in Narmada is dominated by their supply from Deccan deposits with secondary supply from mid?late Proterozoic Vindhyan along with Mesoproterozoic to Mesoarchean� urn:x-wiley:15252027:media:ggge21285:ggge21285-math-0001 ages. Sediments from Netravati reflected signatures of peninsular gneisses dominant with gneisses schists and granodiorite along with Paleoarchean� urn:x-wiley:15252027:media:ggge21285:ggge21285-math-0002 ages. Based on variability of 87Sr/86Sr and 143Nd/144Nd, present study highlight that sediment supplies from tributaries to the mainstream in Narmada is inadequate as compared to that in Netravati. 87Sr/86Sr and 143Nd/144Nd signatures in Narmada and Netravati are comparable with Global Rivers.
    URI
    https://doi.org/10.1002/2016GC006669
    http://drs.nio.org/drs/handle/2264/7868
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