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Understanding Himalayan erosion and the significance of the Nicobar Fan
Stockholm University, Faculty of Science, Department of Geological Sciences.
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Number of Authors: 35
2017 (English)In: Earth and Planetary Science Letters, ISSN 0012-821X, E-ISSN 1385-013X, Vol. 475, 134-142 p.Article in journal (Refereed) Published
Abstract [en]

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 similar to 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.

Place, publisher, year, edition, pages
2017. Vol. 475, 134-142 p.
Keyword [en]
Bengal-Nicobar Fan, submarine fan, Himalayan tectonics, Asian monsoon, Indian Ocean
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:su:diva-147858DOI: 10.1016/j.epsl.2017.07.019ISI: 000411167800012OAI: oai:DiVA.org:su-147858DiVA: diva2:1153099
Available from: 2017-10-27 Created: 2017-10-27 Last updated: 2017-10-27Bibliographically approved

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