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DC Field | Value | Language |
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dc.contributor.author | Dongre, Ashish | - |
dc.contributor.author | Dhote, P.S. | - |
dc.contributor.author | Zamarkar, P. | - |
dc.contributor.author | Sangode, S.J. | - |
dc.contributor.author | Belyanin, B. | - |
dc.contributor.author | Meshram, D.C. | - |
dc.contributor.author | Patil, S.K. | - |
dc.contributor.author | Karmakar, Aaheri | - |
dc.contributor.author | Jain, Lokant | - |
dc.date.accessioned | 2022-08-04T05:30:42Z | - |
dc.date.available | 2022-08-04T05:30:42Z | - |
dc.date.issued | 2022 | - |
dc.identifier.citation | Geological Society, London, Special Publications, v. 513, https://doi.org/10.1144/SP513-2021-34 | en_US |
dc.identifier.uri | http://library.iigm.res.in:8080/xmlui/handle/123456798/293 | - |
dc.description.abstract | Available 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.iso | en | en_US |
dc.subject | Deccan Large Igneous Province | en_US |
dc.subject | Sarnu-Dandali Alkaline Igneous Complex | en_US |
dc.subject | Magmatism, alkaline | en_US |
dc.title | Short-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 Complex | en_US |
dc.type | Article | en_US |
dcterms.source | https://doi.org/10.1144/SP513-2021-34 | |
Appears in Collections: | SEG_Reprints |
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PatilSK_etal_GeolSocPubSpcPub_2022.pdf Restricted Access | 7.56 MB | Adobe PDF | View/Open Request a copy |
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