Understanding Himalayan erosion and the significance of the Nicobar Fan

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.
Document type :
Journal articles
Complete list of metadatas

Cited literature [54 references]  Display  Hide  Download

https://hal-insu.archives-ouvertes.fr/insu-01579460
Contributor : Isabelle Dubigeon <>
Submitted on : Wednesday, November 22, 2017 - 11:40:29 AM
Last modification on : Friday, April 5, 2019 - 8:17:57 PM

File

McNeill-2017.pdf
Publisher files allowed on an open archive

Licence


Distributed under a Creative Commons Attribution 4.0 International License

Identifiers

Citation

Lisa Mcneill, Brandon Dugan, Jan Backman, Kevin Pickering, Hugo Pouderoux, et al.. Understanding Himalayan erosion and the significance of the Nicobar Fan. Earth and Planetary Science Letters, Elsevier, 2017, 475, pp.134-142. ⟨10.1016/j.epsl.2017.07.019⟩. ⟨insu-01579460⟩

Share

Metrics

Record views

1206

Files downloads

101