Mantle-derived spinel lherzolite xenoliths from the deccan volcanic province (India): Implications for the thermal structure of the lithosphere underlying the deccan traps |
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| Institution: | 1. Institute of Earth Sciences (ISTE), University of Lausanne, Building Géopolis, 1015 Lausanne, Switzerland;2. Institute of Earth Surface Dynamics (IDYST), University of Lausanne, Building Géopolis, 1015 Lausanne, Switzerland;3. Instituto Dom Luís, Faculdade de Ciências (IDL-FCUL), Universidade de Lisboa, Portugal;1. Institute of Seismological Research, Raisan, Gandhinagar 382009, India;2. Department of Earth and Environmental Science, KSKV Kachchh University, Bhuj 370001, India;1. Institute of Paleobiology, Polish Academy of Sciences, Twarda 51/55, 00-818 Warsaw, Poland;2. Department of Organismal Biology, Department of Physiology and Developmental Biology, Uppsala University, Norbyvägen 18A, 752 36 Uppsala, Sweden;3. Department of Palaeobiology and Evolution, Faculty of Biology, Biological and Chemical Research Centre, University of Warsaw, Żwirki i Wigury 101, 02-089 Warsaw, Poland |
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| Abstract: | Petrography, mineral and host-rock chemistry of the mantle-derived spinel lherzolite xenoliths in the nephelinites of Kutch, a late variant of the Deccan Traps province, India, are reported. The xenoliths register equilibration temperatures between 920° ± 70°C and 1060° ± 50°C and an ascent time between 19 and 168 days. Representing a palaeogeotherm of minimum heat flow between 60 and 70 mW/m2, the xenoliths possibly came from the oceanic lithosphere under the Deccan field, following the Cretaceous-Eocene fragmentation of Gondwanaland. |
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