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Early (pre-8 Ma) fault activity and temporal strain accumulation in the central Indian Ocean

Record type: Article

The diffuse deformation zone in the central Indian Ocean is the classical example of distributed deformation of the oceanic lithosphere with shortening between the Indian and Capricorn plates manifest as reverse faulting (5–10 km spaced faults) and long-wavelength (100–300 km) folding. The onset of this deformation is commonly regarded as a key far-field indicator for the start of major uplift of the Himalayas and Tibet, some 4000 km further to the north, due to increased deviatoric stresses within the wider India-Asia area. There has been disagreement concerning the likely timing for the onset of deformation between plate motion inversions and seismic reflection-based studies. In the present study, fault displacement data from seismic reflection profiles within the central Indian Ocean demonstrate that compressional activity started much earlier, at around 15.4–13.9 Ma. We reconstruct that 12% of the total reverse fault population had been activated, and 14% of the total strain accumulated, prior to a sharp increase in the deformation rate at 8.0–7.5 Ma. There is no evidence for any regional unconformity before 8.0–7.5 Ma, early shortening was accommodated by activity on single isolated fault blocks. Total strain estimates derived are more variable and complex than those predicted from plate inversion and do not show simple west to east increase.

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Citation

Krishna, K.S., Bull, J.M. and Scrutton, R.A. (2009) Early (pre-8 Ma) fault activity and temporal strain accumulation in the central Indian Ocean Geology, 37, (3), pp. 227-230. (doi:10.1130/G25265A.1).

More information

Published date: April 2009
Keywords: tectonics, diffuse plate boundary, faulting, Indian Ocean, Himalaya

Identifiers

Local EPrints ID: 65656
URI: http://eprints.soton.ac.uk/id/eprint/65656
ISSN: 0091-7613
PURE UUID: 8dc09e33-ae52-4dc8-b928-f381d8da71bf

Catalogue record

Date deposited: 04 Mar 2009
Last modified: 19 Jul 2017 00:32

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Contributors

Author: K.S. Krishna
Author: J.M. Bull
Author: R.A. Scrutton

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