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Reconciling plate kinematic and seismic estimates of lithospheric convergence in the central Indian Ocean

Reconciling plate kinematic and seismic estimates of lithospheric convergence in the central Indian Ocean
Reconciling plate kinematic and seismic estimates of lithospheric convergence in the central Indian Ocean
The far-field signature of the India-Asia collision and history of uplift in Tibet are recorded by sediment input into the Indian Ocean and the strain accumulation history across the diffuse plate boundary between the Indian and Capricorn plates. We describe the history of India-Capricorn convergence from updated estimates of India-Somalia-Capricorn plate rotations and observations derived from seismic reflection data. New India-Capricorn plate rotations for the past 20 m.y. are consistent with slow north-south convergence from 18 Ma about a stationary or nearly stationary pole near the eastern edge of the Chagos-Laccadive ridge, simpler than predicted by previous models based on many fewer data. The new rotations suggest that convergence began between 18 and 14 Ma, consistent with marine seismic evidence for an onset of deformation at 15.4–13.9 Ma. They further show that convergence rates doubled at 8 Ma, in agreement with a sharp increase in fault activity at 8–7.5 Ma seen on seismic reflection profiles. A discrepancy between the total strain estimated from kinematic and seismic reflection data can be reconciled if pervasive reverse faulting within the diffuse plate boundary is accompanied by block rotations of 1°–3°.

0091-7613
307-310
Bull, J.M.
974037fd-544b-458f-98cc-ce8eca89e3c8
De Mets, C.
85618bd9-446e-428f-8fab-a383e5212c36
Krishna, K.S.
fa339710-534a-4d69-9392-d83eddea9a76
Sanderson, D.J.
5653bc11-b905-4985-8c16-c655b2170ba9
Bull, J.M.
974037fd-544b-458f-98cc-ce8eca89e3c8
De Mets, C.
85618bd9-446e-428f-8fab-a383e5212c36
Krishna, K.S.
fa339710-534a-4d69-9392-d83eddea9a76
Sanderson, D.J.
5653bc11-b905-4985-8c16-c655b2170ba9

Bull, J.M., De Mets, C., Krishna, K.S. and Sanderson, D.J. (2010) Reconciling plate kinematic and seismic estimates of lithospheric convergence in the central Indian Ocean. Geology, 38 (4), 307-310. (doi:10.1130/G30521.1).

Record type: Article

Abstract

The far-field signature of the India-Asia collision and history of uplift in Tibet are recorded by sediment input into the Indian Ocean and the strain accumulation history across the diffuse plate boundary between the Indian and Capricorn plates. We describe the history of India-Capricorn convergence from updated estimates of India-Somalia-Capricorn plate rotations and observations derived from seismic reflection data. New India-Capricorn plate rotations for the past 20 m.y. are consistent with slow north-south convergence from 18 Ma about a stationary or nearly stationary pole near the eastern edge of the Chagos-Laccadive ridge, simpler than predicted by previous models based on many fewer data. The new rotations suggest that convergence began between 18 and 14 Ma, consistent with marine seismic evidence for an onset of deformation at 15.4–13.9 Ma. They further show that convergence rates doubled at 8 Ma, in agreement with a sharp increase in fault activity at 8–7.5 Ma seen on seismic reflection profiles. A discrepancy between the total strain estimated from kinematic and seismic reflection data can be reconciled if pervasive reverse faulting within the diffuse plate boundary is accompanied by block rotations of 1°–3°.

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More information

Published date: October 2010
Organisations: Ocean and Earth Science, Civil Engineering & the Environment

Identifiers

Local EPrints ID: 74293
URI: https://eprints.soton.ac.uk/id/eprint/74293
ISSN: 0091-7613
PURE UUID: 7518e251-8b52-4ce8-9a1d-c593e13b03f6
ORCID for D.J. Sanderson: ORCID iD orcid.org/0000-0002-2144-3527

Catalogue record

Date deposited: 11 Mar 2010
Last modified: 06 Jun 2018 12:37

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