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dc.contributor.authorDongre, Ashish-
dc.contributor.authorDhote, P.S.-
dc.contributor.authorZamarkar, P.-
dc.contributor.authorSangode, S.J.-
dc.contributor.authorBelyanin, B.-
dc.contributor.authorMeshram, D.C.-
dc.contributor.authorPatil, S.K.-
dc.contributor.authorKarmakar, Aaheri-
dc.contributor.authorJain, Lokant-
dc.date.accessioned2022-08-04T05:30:42Z-
dc.date.available2022-08-04T05:30:42Z-
dc.date.issued2022-
dc.identifier.citationGeological Society, London, Special Publications, v. 513, https://doi.org/10.1144/SP513-2021-34en_US
dc.identifier.urihttp://library.iigm.res.in:8080/xmlui/handle/123456798/293-
dc.description.abstractAvailable geochronological information on Deccan indicates prolonged (started at 68.5 Ma) alkaline magmatism related to the Réunion mantle plume based on the 40Ar/39Ar ages from Sarnu-Dandali and Mundwara alkaline complexes. We studied in detail an alkaline lamprophyre, from the Sarnu-Dandali Complex, rich in groundmass (magmatic) as well as xenocrystic phlogopites and clinopyroxenes. 40Ar/39Ar age determinations of the phlogopites from this lamprophyre reveal two distinct ages of 65.44+1.5 Ma and 68.17+ 1 Ma. However, palaeomagnetic results show a VGP at 32.31° N and 298.52° E concordant with that of the Deccan Super Pole at 65.5 Ma and support the younger eruption age at c. 65.44+1.5 Ma. Analysed phlogopites lack any signs of retention of excess radiogenic Ar and yield similar inverse isochron ages, which suggests that the older age of c. 68.17+1 Ma belongs to the crystallization of xenocrystic phlogopite during mantle metasomatism. Trace element compositions support derivation of lamprophyre magma from an OIB-type enriched (metasomatized) mantle source with an involvement of phlogopite. This finding suggests that the pre-Deccan ages of c. 68–69 Ma reported previously may reflect the timing of metasomatism of the subcratonic lithospheric mantle during the separation of Greater-Seychelles from India at c. 68.5 Ma. The absence of pre-Deccan alkaline rocks therefore indicates the short duration (between 67–65 Ma) of alkaline as well as small-volume, volatile-rich magmatism directly related to the Réunion (Deccan) plume.en_US
dc.language.isoenen_US
dc.subjectDeccan Large Igneous Provinceen_US
dc.subjectSarnu-Dandali Alkaline Igneous Complexen_US
dc.subjectMagmatism, alkalineen_US
dc.titleShort-lived alkaline magmatism related to the réunion plume in the Deccan Large Igneous Province: inferences from petrology, 40Ar/39Ar geochronology and palaeomagnetism of lamprophyre from the Sarnu-Dandali Alkaline Igneous Complexen_US
dc.typeArticleen_US
dcterms.sourcehttps://doi.org/10.1144/SP513-2021-34
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