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

Record type: Article

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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Citation

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).

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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: 18 Jul 2017 10:44

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Contributors

Author: David R. Limmer
Author: Philipp Böning
Author: Liviu Giosan
Author: Camilo Ponton
Author: Cornelia M. Köhler
Author: Ali R. Tabrez
Author: Peter D. Clift

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