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Understanding Himalayan erosion and the significance of the Nicobar Fan

Understanding Himalayan erosion and the significance of the Nicobar Fan
Understanding Himalayan erosion and the significance of the Nicobar Fan
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 ~9.5 Ma and reaching 250-350 m/Myr in the 9.5-2 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.
0012-821X
134-142
McNeill, Lisa
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Dugan, Brandon
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Backman, Jan
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Pickering, Kevin T.
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Pouderoux, Hugo F.A.
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Henstock, Timothy J.
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Petronotis, Katerina E.
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Carter, Andrew
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Milliken, Kitty L.
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Kutterolf, Steffen
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Mukoyoshi, Hideki
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Chen, Wenhuang
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Mitchison, Freya L.
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Hüpers, Andre
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Thomas, Ellen
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Chen, Wenhuang
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Mitchison, Freya L.
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Colson, Tobias A.
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Hamahashi, Mari
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House, Brian M.
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Hüpers, Andre
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Jeppson, Tamara N.
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Kenigsberg, Abby R.
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Song, Insun
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Torres, Marta E.
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Vrolijk, Peter J.
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Yang, Tao
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Zhao, Xixi
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Thomas, Ellen
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McNeill, Lisa, Dugan, Brandon, Backman, Jan, Pickering, Kevin T., Pouderoux, Hugo F.A., Henstock, Timothy J., Petronotis, Katerina E., Carter, Andrew, Chemale Jr., Farid, Milliken, Kitty L., Kutterolf, Steffen, Mukoyoshi, Hideki, Chen, Wenhuang, Kachovich, Sarah, Mitchison, Freya L., Bourlange, Sylvain, Colson, Tobias A., Frederik, Marina C.G., Guèrin, Gilles, Hamahashi, Mari, House, Brian M., Hüpers, Andre, Jeppson, Tamara N., Kenigsberg, Abby R., Kuranaga, Mebae, Nair, Nisha, Owari, Satoko, Shan, Yehua, Song, Insun, Torres, Marta E., Vannucchi, Paola, Vrolijk, Peter J., Yang, Tao, Zhao, Xixi and Thomas, Ellen (2017) Understanding Himalayan erosion and the significance of the Nicobar Fan. Earth and Planetary Science Letters, 475, 134-142. (doi:10.1016/j.epsl.2017.07.019).

Record type: Article

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 ~9.5 Ma and reaching 250-350 m/Myr in the 9.5-2 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.

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Accepted/In Press date: 10 July 2017
e-pub ahead of print date: 10 August 2017
Published date: 1 October 2017

Identifiers

Local EPrints ID: 412609
URI: http://eprints.soton.ac.uk/id/eprint/412609
ISSN: 0012-821X
PURE UUID: a461ce92-83c7-469e-bb75-703e05167d2e
ORCID for Timothy J. Henstock: ORCID iD orcid.org/0000-0002-2132-2514

Catalogue record

Date deposited: 24 Jul 2017 16:32
Last modified: 07 Oct 2020 05:18

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Contributors

Author: Lisa McNeill
Author: Brandon Dugan
Author: Jan Backman
Author: Kevin T. Pickering
Author: Hugo F.A. Pouderoux
Author: Katerina E. Petronotis
Author: Andrew Carter
Author: Farid Chemale Jr.
Author: Kitty L. Milliken
Author: Steffen Kutterolf
Author: Hideki Mukoyoshi
Author: Wenhuang Chen
Author: Sarah Kachovich
Author: Freya L. Mitchison
Author: Sylvain Bourlange
Author: Tobias A. Colson
Author: Marina C.G. Frederik
Author: Gilles Guèrin
Author: Mari Hamahashi
Author: Brian M. House
Author: Andre Hüpers
Author: Tamara N. Jeppson
Author: Abby R. Kenigsberg
Author: Mebae Kuranaga
Author: Nisha Nair
Author: Satoko Owari
Author: Yehua Shan
Author: Insun Song
Author: Marta E. Torres
Author: Paola Vannucchi
Author: Peter J. Vrolijk
Author: Tao Yang
Author: Xixi Zhao
Author: Ellen Thomas

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