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Geochemical record of Holocene to Recent sedimentation on the Western Indus continental shelf, Arabian Sea

Geochemical record of Holocene to Recent sedimentation on the Western Indus continental shelf, Arabian Sea
Geochemical record of Holocene to Recent sedimentation on the Western Indus continental shelf, Arabian Sea
We present a multiproxy geochemical analysis of two cores recovered from the Indus Shelf spanning the Early Holocene to Recent (<14 ka). Indus-23 is located close to the modern Indus River, while Indus-10 is positioned ?100 km further west. The Holocene transgression at Indus-10 was over a surface that was strongly weathered during the last glacial sea level lowstand. Lower Holocene sediments at Indus-10 have higher ?Nd values compared to those at the river mouth indicating some sediment supply from the Makran coast, either during the deposition or via reworking of older sediments outcropping on the shelf. Sediment transport from Makran occurred during transgressive intervals when sea level crossed the mid shelf. The sediment flux from non-Indus sources to Indus-10 peaked between 11 ka and 8 ka. A hiatus at Indus-23 from 8 ka until 1.3 ka indicates non-deposition or erosion of existing Indus Shelf sequences. Higher ?Nd values seen on the shelf compared to the delta imply reworking of older delta sediments in building Holocene clinoforms. Chemical Index of Alteration (CIA), Mg/Al and Sr isotopes are all affected by erosion of detrital carbonate, which reduced through the Holocene. K/Al data suggest that silicate weathering peaked ca. 4–6 ka and was higher at Indus-10 compared to Indus-23. Fine-grained sediments that make up the shelf have geochemical signatures that are different from the coarser grained bulk sediments measured in the delta plain. The Indus Shelf data highlight the complexity of reconstructing records of continental erosion and provenance in marine settings.
1525-2027
Q01008
Limmer, David R.
35404589-348c-4795-9726-075bcf81d5db
Böning, Philipp
06f11a20-b185-4c67-ae35-f2c50d2a36d1
Giosan, Liviu
46802e93-8a58-4660-b2d3-fdd5dfe100b8
Ponton, Camilo
326e74df-dda4-4fb8-a1f9-04fa13776547
Köhler, Cornelia M.
a30315df-3d99-46e0-ae95-7b1209492037
Cooper, Matthew J.
54f7bff0-1f8c-4835-8358-71eef8529e7a
Tabrez, Ali R.
88fb298e-5cca-4d51-a040-692af62cbe49
Clift, Peter D.
24c0646e-f897-45ad-bd50-817eb88fea41
Limmer, David R.
35404589-348c-4795-9726-075bcf81d5db
Böning, Philipp
06f11a20-b185-4c67-ae35-f2c50d2a36d1
Giosan, Liviu
46802e93-8a58-4660-b2d3-fdd5dfe100b8
Ponton, Camilo
326e74df-dda4-4fb8-a1f9-04fa13776547
Köhler, Cornelia M.
a30315df-3d99-46e0-ae95-7b1209492037
Cooper, Matthew J.
54f7bff0-1f8c-4835-8358-71eef8529e7a
Tabrez, Ali R.
88fb298e-5cca-4d51-a040-692af62cbe49
Clift, Peter D.
24c0646e-f897-45ad-bd50-817eb88fea41

Limmer, David R., Böning, Philipp, Giosan, Liviu, Ponton, Camilo, Köhler, Cornelia M., Cooper, Matthew J., Tabrez, Ali R. and Clift, Peter D. (2012) Geochemical record of Holocene to Recent sedimentation on the Western Indus continental shelf, Arabian Sea. Geochemistry, Geophysics, Geosystems, 13, Q01008. (doi:10.1029/2011GC003845).

Record type: Article

Abstract

We present a multiproxy geochemical analysis of two cores recovered from the Indus Shelf spanning the Early Holocene to Recent (<14 ka). Indus-23 is located close to the modern Indus River, while Indus-10 is positioned ?100 km further west. The Holocene transgression at Indus-10 was over a surface that was strongly weathered during the last glacial sea level lowstand. Lower Holocene sediments at Indus-10 have higher ?Nd values compared to those at the river mouth indicating some sediment supply from the Makran coast, either during the deposition or via reworking of older sediments outcropping on the shelf. Sediment transport from Makran occurred during transgressive intervals when sea level crossed the mid shelf. The sediment flux from non-Indus sources to Indus-10 peaked between 11 ka and 8 ka. A hiatus at Indus-23 from 8 ka until 1.3 ka indicates non-deposition or erosion of existing Indus Shelf sequences. Higher ?Nd values seen on the shelf compared to the delta imply reworking of older delta sediments in building Holocene clinoforms. Chemical Index of Alteration (CIA), Mg/Al and Sr isotopes are all affected by erosion of detrital carbonate, which reduced through the Holocene. K/Al data suggest that silicate weathering peaked ca. 4–6 ka and was higher at Indus-10 compared to Indus-23. Fine-grained sediments that make up the shelf have geochemical signatures that are different from the coarser grained bulk sediments measured in the delta plain. The Indus Shelf data highlight the complexity of reconstructing records of continental erosion and provenance in marine settings.

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Published date: 2012
Organisations: Geochemistry

Identifiers

Local EPrints ID: 210875
URI: http://eprints.soton.ac.uk/id/eprint/210875
ISSN: 1525-2027
PURE UUID: a9455438-0cbf-4a76-9f3e-762405c82d6b
ORCID for Matthew J. Cooper: ORCID iD orcid.org/0000-0002-2130-2759

Catalogue record

Date deposited: 10 Feb 2012 11:40
Last modified: 10 Dec 2019 01:48

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