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Impacts of sediment supply and local tectonics on clinoform distribution: the seismic stratigraphy of the mid Pleistocene-Holocene Indus Shelf

Impacts of sediment supply and local tectonics on clinoform distribution: the seismic stratigraphy of the mid Pleistocene-Holocene Indus Shelf
Impacts of sediment supply and local tectonics on clinoform distribution: the seismic stratigraphy of the mid Pleistocene-Holocene Indus Shelf
We present results from the first high-resolution seismic reflection survey of the inner Western Indus Shelf, and Indus Delta, Arabian Sea. The results show major regional differences in sedimentation across the shelf from east to west, as well as north to south, both since the Last Glacial Maximum (*20 ka) and over longer time scales. We identify 10 major regional reflectors, interpreted as representing sea level lowstands. Strong compressive folding is observed underlying a reflector we have called Horizon 6 in the north-western shelf, probably compression associated with the transpressional deformation of the Murray Ridge plate boundary. Downslope profiles show a series of well developed clinoforms, principally at the shelf edge, indicating significant preservation of large packages of sediment during lowstands. These clinoforms have developed close to zones of deformation, suggesting that subsidence is a factor in controlling sedimentation and consequently erosion of the Indus Shelf. These clinoforms fan out from dome features (tectonic anticlines) mostly located close to the modern shoreline.
indus delta, quaternary, clinoforms, seismic stratigraphy
0025-3235
251-267
Limmer, David R
472d9274-2311-4c7d-bdd4-e168f47e111e
Henstock, Timothy J.
27c450a4-3e6b-41f8-97f9-4e0e181400bb
Giosan, Liviu
46802e93-8a58-4660-b2d3-fdd5dfe100b8
Ponton, Camilo
326e74df-dda4-4fb8-a1f9-04fa13776547
Tabrez, Ali R.
88fb298e-5cca-4d51-a040-692af62cbe49
Macdonald, David I.M.
b22dd2bd-2bce-4373-98ba-e97a6b5493fb
Clift, Peter D.
24c0646e-f897-45ad-bd50-817eb88fea41
Limmer, David R
472d9274-2311-4c7d-bdd4-e168f47e111e
Henstock, Timothy J.
27c450a4-3e6b-41f8-97f9-4e0e181400bb
Giosan, Liviu
46802e93-8a58-4660-b2d3-fdd5dfe100b8
Ponton, Camilo
326e74df-dda4-4fb8-a1f9-04fa13776547
Tabrez, Ali R.
88fb298e-5cca-4d51-a040-692af62cbe49
Macdonald, David I.M.
b22dd2bd-2bce-4373-98ba-e97a6b5493fb
Clift, Peter D.
24c0646e-f897-45ad-bd50-817eb88fea41

Limmer, David R, Henstock, Timothy J., Giosan, Liviu, Ponton, Camilo, Tabrez, Ali R., Macdonald, David I.M. and Clift, Peter D. (2012) Impacts of sediment supply and local tectonics on clinoform distribution: the seismic stratigraphy of the mid Pleistocene-Holocene Indus Shelf. Marine Geophysical Researches, 33 (3), 251-267. (doi:10.1007/s11001-012-9160-6).

Record type: Article

Abstract

We present results from the first high-resolution seismic reflection survey of the inner Western Indus Shelf, and Indus Delta, Arabian Sea. The results show major regional differences in sedimentation across the shelf from east to west, as well as north to south, both since the Last Glacial Maximum (*20 ka) and over longer time scales. We identify 10 major regional reflectors, interpreted as representing sea level lowstands. Strong compressive folding is observed underlying a reflector we have called Horizon 6 in the north-western shelf, probably compression associated with the transpressional deformation of the Murray Ridge plate boundary. Downslope profiles show a series of well developed clinoforms, principally at the shelf edge, indicating significant preservation of large packages of sediment during lowstands. These clinoforms have developed close to zones of deformation, suggesting that subsidence is a factor in controlling sedimentation and consequently erosion of the Indus Shelf. These clinoforms fan out from dome features (tectonic anticlines) mostly located close to the modern shoreline.

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e-pub ahead of print date: 1 August 2012
Published date: 2012
Keywords: indus delta, quaternary, clinoforms, seismic stratigraphy
Organisations: Geology & Geophysics

Identifiers

Local EPrints ID: 341993
URI: http://eprints.soton.ac.uk/id/eprint/341993
ISSN: 0025-3235
PURE UUID: 4ce7962d-5cee-43de-b294-f1cd27919901
ORCID for Timothy J. Henstock: ORCID iD orcid.org/0000-0002-2132-2514

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Date deposited: 09 Aug 2012 08:12
Last modified: 15 Mar 2024 03:04

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Contributors

Author: David R Limmer
Author: Liviu Giosan
Author: Camilo Ponton
Author: Ali R. Tabrez
Author: David I.M. Macdonald
Author: Peter D. Clift

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