Successive shifts of the India-Africa transform plate boundary during the Late Cretaceous-Paleogene interval: Implications for ophiolite emplacement along transforms - Paléoenvironnemements Paléoclimats, Bassins Accéder directement au contenu
Article Dans Une Revue Journal of Asian Earth Sciences Année : 2020

Successive shifts of the India-Africa transform plate boundary during the Late Cretaceous-Paleogene interval: Implications for ophiolite emplacement along transforms

Marc Fournier
Gérôme Calvès
Dia Ninkabou
Manuel Pubellier

Résumé

The Arabian Sea in the NW Indian Ocean is a place where two major transform boundaries are currently active: the Owen Fracture Zone between India and Arabia and the Owen Transform between India and Somalia. These transform systems result from the fragmentation of the India-Africa Transform boundary, which initiated about 90 Myrs ago, when the India-Seychelles block separated from Madagascar to move towards Eurasia. Therefore, the geological record of the Arabian Sea makes it possible to investigate the sensitivity of a transform system to several major geodynamic changes. Here we focus on the evolution of the India-Africa transform system during the~47-90 Ma interval. We identify the Late Cretaceous (~90-65 Ma) transform plate boundary along Chain Ridge, in the North Somali Basin. From 65 to~42-47 Ma, the India-Africa transform is identified at the Chain Fracture Zone, which crossed both the Owen Basin and the North East Oman margin. Finally, the transform system jumped to its present-day location in the vicinity of the Owen Ridge. These shifts of the India-Africa boundary with time provide a consistent paleogeographic framework for the emplacement of the Masirah Ophiolitic Belt, which constitutes a case of ophiolite emplaced along a transform boundary. The successive locations of the India-Africa boundary further highlight the origin of the Owen Basin lithosphere incoming into the Makran subduction zone.
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Dates et versions

hal-02451430 , version 1 (01-10-2020)

Identifiants

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Mathieu Rodriguez, Philippe Huchon, Nicolas Chamot-Rooke, Marc Fournier, Matthias Delescluse, et al.. Successive shifts of the India-Africa transform plate boundary during the Late Cretaceous-Paleogene interval: Implications for ophiolite emplacement along transforms. Journal of Asian Earth Sciences, 2020, 191, pp.104225. ⟨10.1016/j.jseaes.2019.104225⟩. ⟨hal-02451430⟩
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