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    Understanding Himalayan erosion and the significance of the Nicobar Fan

    McNeill, L.C. and Dugan, B. and Backman, J. and Pickering, K.T. and Pouderoux, H.F.A. and Henstock, T.J. and Petronotis, K.E. and Carter, Andrew and Jr., F.C. and Milliken, K.L. and Kutterolf, S. and Mukoyoshi, H. and Chen, W. and Kachovich, S. and Mitchison, F.L. and Bourlange, S. and Colson, T.A. and Frederik, M.C.G. and Guèrin, G. and Hamahashi, M. and House, B.M. and Hüpers, A. and Jeppson, T.N. and Kenigsberg, A.R. and Kuranaga, M. and Nair, N. and Owari, S. and Shan, Y. and Song, I. and Torres, M.E. and Vannucchi, P. and Vrolijk, P.J. and Yang, T. and Zhao, X. and Thomas, E. (2017) Understanding Himalayan erosion and the significance of the Nicobar Fan. Earth and Planetary Science Letters 475 , 134 - 142. ISSN 0012-821X.

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    Abstract

    Abstract A holistic view of the Bengal-Nicobar Fan system requires sampling the full sedimentary section of the Nicobar Fan, which was achieved for the first time by International Ocean Discovery Program (IODP) Expedition 362 west of North Sumatra. We identified a distinct rise in sediment accumulation rate (SAR) beginning c. 9.5 Ma and reaching 250-350 m/Myr in the 9.52 Ma interval, which equal or far exceed rates on the Bengal Fan at similar latitudes. This marked rise in {SAR} and a constant Himalayan-derived provenance necessitates a major restructuring of sediment routing in the Bengal-Nicobar submarine fan. This coincides with the inversion of the Eastern Himalayan Shillong Plateau and encroachment of the west-propagating Indo-Burmese wedge, which reduced continental accommodation space and increased sediment supply directly to the fan. Our results challenge a commonly held view that changes in sediment flux seen in the Bengal-Nicobar submarine fan were caused by discrete tectonic or climatic events acting on the Himalayan-Tibetan Plateau. Instead, an interplay of tectonic and climatic processes caused the fan system to develop by punctuated changes rather than gradual progradation.

    Metadata

    Item Type: Article
    Keyword(s) / Subject(s): Bengal–Nicobar Fan, submarine fan, Himalayan tectonics, Asian monsoon, Indian Ocean
    School: Birkbeck Schools and Departments > School of Science > Earth and Planetary Sciences
    Research Centre: Earth and Planetary Sciences, Institute of
    Depositing User: Professor Andrew Carter
    Date Deposited: 15 Aug 2017 07:52
    Last Modified: 14 May 2018 13:16
    URI: http://eprints.bbk.ac.uk/id/eprint/19352

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