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Sedimentology, stra...
Sedimentology, stratigraphy and architecture of the Nicobar Fan (Bengal-Nicobar Fan System), Indian Ocean : Results from International Ocean Discovery Program Expedition 362
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Pickering, Kevin T. (författare)
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Pouderoux, Hugo (författare)
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McNeill, Lisa C. (författare)
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- Backman, Jan (författare)
- Stockholms universitet,Institutionen för geologiska vetenskaper
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Chemale, Farid (författare)
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Kutterolf, Steffen (författare)
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Milliken, Kitty L. (författare)
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Mukoyoshi, Hideki (författare)
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Henstock, Timothy J. (författare)
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Stevens, Duncan E. (författare)
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Parnell, Charlie (författare)
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Dugan, Brandon (författare)
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(creator_code:org_t)
- 2020-02-23
- 2020
- Engelska.
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Ingår i: Sedimentology. - : Wiley. - 0037-0746 .- 1365-3091. ; 67:5, s. 2248-2281
- Relaterad länk:
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https://discovery.uc...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Drill sites in the southern Bay of Bengal at 3 degrees N 91 degrees E (International Ocean Discovery Program Expedition 362) have sampled for the first time a complete section of the Nicobar Fan and below to the oceanic crust. This generally overlooked part of the Bengal-Nicobar Fan System may provide new insights into uplift and denudation rates of the Himalayas and Tibetan Plateau. The Nicobar Fan comprises sediment gravity-flow deposits, mostly turbidites, that alternate with hemipelagite drapes and pelagite intervals of varying thicknesses. The decimetre-thick to metre-thick oldest pre-fan sediments (limestones/chalks) dated at 69 Ma are overlain by volcanic material and slowly accumulated pelagites (0.5 g cm(-2) kyr(-1)). At Expedition 362 Site U1480, terrigenous input began in the early Miocene at ca 22.5 Ma as muds, overlain by very thin-bedded and thin-bedded muddy turbidites at ca 19.5 Ma. From 9.5 Ma, sand content and sediment supply sharply increase (from 1-5 to 10-50 g cm(-2) kyr(-1)). Despite the abundant normal faulting in the Nicobar Fan compared with the Bengal Fan, it offers a better-preserved and more homogeneous sedimentary record with fewer unconformities. The persistent connection between the two fans ceased at 0.28 Ma when the Nicobar Fan became inactive. The Nicobar Fan is a major sink for Himalaya-derived material. This study presents integrated results of International Ocean Discovery Program Expedition 362 with older Deep Sea Drilling Project/Ocean Drilling Program/International Ocean Discovery Program sites that show that the Bengal-Nicobar Fan System experienced successive large-scale avulsion processes that switched sediment supply between the Bengal Fan (middle Miocene and late Pleistocene) and the Nicobar Fan (late Miocene to early Pleistocene). A quantitative analysis of the submarine channels of the Nicobar Fan is also presented, including their stratigraphic frequency, showing that channel size/area and abundance peaked at ca 2 to 3 Ma, but with a distinct low at 3 to 7 Ma: the intervening stratigraphic unit was a time of reduced sediment accumulation rates.
Ämnesord
- NATURVETENSKAP -- Geovetenskap och miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences (hsv//eng)
Nyckelord
- Bengal Fan
- Indian Ocean
- IODP Expedition 362
- Nicobar Fan
- sediment gravity flow
- submarine fan
- Sunda Subduction Zone
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Pickering, Kevin ...
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Pouderoux, Hugo
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McNeill, Lisa C.
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Backman, Jan
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Chemale, Farid
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Kutterolf, Steff ...
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visa fler...
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Milliken, Kitty ...
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Mukoyoshi, Hidek ...
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Henstock, Timoth ...
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Stevens, Duncan ...
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Parnell, Charlie
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Dugan, Brandon
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visa färre...
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Stockholms universitet