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The extent of continental material in oceans : C-Blocks and the Laxmi Basin example.

Werner, P. and Foulger, G. R. and Gernigon, L. and Guan, H. and Geoffroy, L. (2020) 'The extent of continental material in oceans : C-Blocks and the Laxmi Basin example.', Geophysical journal international., 222 (3). pp. 1471-1479.

Abstract

We propose a tectonic interpretation for the outer-SDRs (SDRs: Seaward-Dipping Reflectors) and Pannikar central ridge in the aborted Laxmi Basin west of India from wide-angle seismic reflection data. The outer-SDRs comprise syn-tectonic extrusives (lavas and/or volcaniclastics) emplaced above passively exhumed mid-to-lower mafic crust of continental origin. They erupted following sudden lithosphere weakening associated with isolation of a continental block (a ‘C-Block’). Continuous magmatic addition during crustal extension allowed stretching of the lower crust whilst maintaining constant or even increasing thickness. A similar process occurred at both conjugate margins allowing bulk, pure-shear plate separation and formation of linear magnetic anomalies. The Laxmi example can explain enigmatic features observed in mature oceans such as presence of distal buoyant plateaus of thick continental crust away from the margins.

Item Type:Article
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Status:Peer-reviewed
Publisher Web site:https://doi.org/10.1093/gji/ggaa215
Publisher statement:This article has been accepted for publication in Geophysical journal international ©: 2020 Published by Oxford University Press on behalf of The Royal Astronomical Society. All rights reserved.
Date accepted:30 April 2020
Date deposited:07 October 2020
Date of first online publication:05 May 2020
Date first made open access:07 October 2020

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