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Article Dans Une Revue Nature Communications Année : 2020

Evidence for simple volcanic rifting not complex subduction initiation in the Laxmi Basin

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In their recent paper Pandey et al.1 use geochemical data from an International Ocean Discovery Program (IODP) site in the Laxmi Basin to propose a previously unrecognized proto-subduction zone in the eastern Arabian Sea in the region of Laxmi Basin (LB), offshore western India, during the Late Cretaceous-Early Cenozoic. A short section of basaltic basement (~16 m penetration) was recovered at Site U1457 on the eastern flank of Laxmi Ridge (LR) (Fig. 1). The geochemistry of the volcanic rocks exhibited subduction-related characters, such as relative Nb and Ta depletions, while Nd and Sr isotopes indicate some involvement of continental material during petrogenesis, interpreted as the incorporation of subducted sediment within mantle melts. On the basis of these data this study proposes a significant revision of the Cretaceous-Cenozoic plate motions involving complex shearing and rotation of blocks during the opening of the Indian Ocean. However, we here argue that the primary lines of evidence used in this study are misinterpreted and that other data sets in the region, not accounted for by these authors, render this new model untenable.
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hal-02917543 , version 1 (20-08-2020)

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Peter Clift, Gérome Calves, Tara Jonell. Evidence for simple volcanic rifting not complex subduction initiation in the Laxmi Basin. Nature Communications, 2020, 11 (1), ⟨10.1038/s41467-020-16569-y⟩. ⟨hal-02917543⟩
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