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dc.contributor.authorHazra, A.
dc.contributor.authorSaha, A.
dc.contributor.authorVerencar, A.
dc.contributor.authorSatyanarayanan, M.
dc.contributor.authorGanguly, S.
dc.contributor.authorKotha, M.
dc.date.accessioned2021-09-30
dc.date.accessioned2021-10-01T07:25:53Z
dc.date.available2021-09-05
dc.date.available2021-10-01T07:25:53Z
dc.date.issued2021
dc.identifier.citationLithosphere, vol.2021(Sp 6); 2021; Article no: 9706924
dc.identifier.issn1941-8264
dc.identifier.otherhttps://pubs.geoscienceworld.org/gsa/lithosphere/article/2021/Special6/9706924/606652
dc.identifier.urihttps://doi.org/10.2113/2021/9706924
dc.identifier.urihttps://drs.nio.org/drs/handle/2264/8741
dc.descriptionIF2020 - 3.375
dc.description.abstractThe phenomena of reactive percolation of enriched asthenospheric melts and pervasive melt-rock interactions at mid oceanic ridge-rift systems are the principal proponents for mantle refertilization and compositional heterogeneity. This study presents new mineralogical and geochemical data for the abyssal peridotites exposed along the Vema and Vityaz fracture zones of the Central Indian Ridge (CIR) to address factors contributing to the chemical heterogeneity of CIR mantle. Cr-spinel (Cr#: 0.37-0.59) chemistry classifies these rocks as alpine-type peridotites and corroborates a transitional depleted MORB type to enriched, SSZ-related arc-type magma composition. HFSE and REE geochemistry further attests to an enriched intraoceanic forearc mantle affinity. The distinct boninitic signature of these rocks reflected by LREE>MREE<HREE and PGE compositions substantiates refertilization of the CIR mantle arzburgites by boninitic melt percolation concomitant to initiation of oceanic subduction. The mineral chemistry, trace, and PGE signatures of the CIR peridotites envisage (i) replenishment of depleted sub-ridge upper mantle by impregnation of subduction-derived boninitic melts, (ii) tectonic transition from mid oceanic ridge-rift to an embryonic suprasubduction zone, and (iii) initiation of spontaneous intraoceanic subduction along submarine transform faults and fracture zones of slow-spreading CIR owing to the weakness and mechanical instability of older, denser, and negatively buoyant Indian Ocean lithosphere.
dc.languageen
dc.publisherGeological Society of America- GeoScienceWorld
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.titleRefertilization of mantle peridotites from the Central Indian Ridge: Response to a geodynamic transition
dc.typeJournal Article
dc.affiliation.authorCSIR-National Institute of Oceanography, Dona Paula, Goa, India


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