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dc.contributor.authorDesa, M.
dc.contributor.authorJacob, J.
dc.contributor.authorKhan, S.A.
dc.contributor.authorCarlier, B.
dc.date.accessioned2024-10-03
dc.date.accessioned2024-10-10T11:46:04Z
dc.date.available2024-06-12
dc.date.available2024-10-10T11:46:04Z
dc.date.issued2024
dc.identifier.citationTectonics, vol.43(6); 2024; Article no: e2024TC008263
dc.identifier.issn1944-9194
dc.identifier.otherhttps://onlinelibrary.wiley.com/doi/full/10.1029/2024TC008263
dc.identifier.urihttps://doi.org/10.1029/2024TC008263
dc.identifier.urihttp://drs.nio.res.in/drs/handle/2264/9296
dc.descriptionIF2022=1.1
dc.description.abstractThe breakup of India from Antarctica in the Early Cretaceous and subsequent seafloor spreading in the NW-SE direction initiated the formation of the Bay of Bengal and its conjugate Enderby Basin. Two hypotheses are proposed to explain the evolutionary tectonics between India and Antarctica. One involves a single breakup, while the second invokes another breakup episode. Further, a major reorganization of the plate boundaries in the mid-Cretaceous caused the spreading center to align E-W by Late Cretaceous. The tectonics involved in this spreading direction change is unknown and difficult to understand as it occurred in the mid-Cretaceous, coincident with the Cretaceous Normal Superchron. In the present study, we have generated a revised magnetic isochron map of the Bay of Bengal and used the modulus of its analytic signal to understand the evolutionary tectonics between the two plates, India and Antarctica. Mesozoic magnetic anomalies M12n to M0, and mid-Cretaceous incursion Q2 (108Ma) are identified in the western basin of the Bay of Bengal, while Q2, Q1 (92Ma) and Late Cretaceous isochron A34 are inferred in its eastern basin. Gravity grid reconstructions demonstrate asymmetrical crustal accretion in the conjugate corridors. Fan-shaped spreading and a southward ridge jump between 108 and 92Ma in the eastern basin, aided the ?40 clockwise rotation of the spreading center. The presence of volcanic basement beneath the additional crust suggests on-axis mode of formation for the Ninetyeast Ridge by 100Ma. The present study favors the two-phase breakup model for the evolution of these plates.
dc.languageen
dc.publisherJohn Wiley & Sons, Ltd
dc.relation.isreferencedbySCI
dc.rightsOnly the author version of the copright reserved papers uploaded. Contact drs@nio.org for any complaints regarding copyright violations
dc.titleReinterpretation of marine magnetic anomalies in the Bay of Bengal: Implications for plate tectonics during the mid-cretaceous
dc.typeJournal Article
dc.affiliation.authorCSIR-National Institute of Oceanography, Dona Paula, Goa, India


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