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<title lang=en>Geochemistry of the Panjal Traps basalts (NW Himalaya): records of the Pangea Permian break-up</title>
<creator>Chauvet, François</creator>
<creator>Lapierre, Henriette</creator>
<creator>Bosch, Delphine</creator>
<creator>Guillot, Stéphane</creator>
<creator>Mascle, Georges</creator>
<creator>Vannay, Jean-Claude</creator>
<creator>Cotten, Joseph</creator>
<creator>BRUNET, Pierre</creator>
<creator>Keller, Francine</creator>
<contributor>Laboratoire de Géodynamique des Chaines Alpines (LGCA) ; Observatoire des Sciences de l'Univers de Grenoble (OSUG) ; Université Joseph Fourier - Grenoble 1 (UJF) - Institut national des sciences de l'Univers (INSU - CNRS) - Centre National de la Recherche Scientifique (CNRS) - Université Joseph Fourier - Grenoble 1 (UJF) - Institut national des sciences de l'Univers (INSU - CNRS) - Centre National de la Recherche Scientifique (CNRS) - Institut des Sciences de la Terre (ISTerre) ; Université Joseph Fourier - Grenoble 1 (UJF) - Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR) - Institut national des sciences de l'Univers (INSU - CNRS) - Institut de recherche pour le développement [IRD] : UR219 - PRES Université de Grenoble - Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry]) - Centre National de la Recherche Scientifique (CNRS) - Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR) - Institut de recherche pour le développement [IRD] : UR219 - PRES Université de Grenoble - Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry]) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Géosciences Montpellier ; Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Institute of Mineralogy and Geochemistry ; University of Lausanne</contributor>
<contributor>Domaines Océaniques (LDO) ; Institut national des sciences de l'Univers (INSU - CNRS) - Université de Brest (UBO) - Observatoire des Sciences de l'Univers - Institut d'écologie et environnement - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Laboratoire des Mécanismes et Transfert en Géologie (LMTG) ; Université Paul Sabatier - Toulouse 3 (UPS) - Observatoire Midi-Pyrénées (OMP) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<description>National audience</description>
<source>EISSN: 1777-5817</source>
<source>Bulletin de la Société Géologique de France</source>
<publisher>Société géologique de France</publisher>
<identifier>insu-00338862</identifier>
<identifier>https://hal-insu.archives-ouvertes.fr/insu-00338862</identifier>
<source>https://hal-insu.archives-ouvertes.fr/insu-00338862</source>
<source>Bulletin de la Société Géologique de France, Société géologique de France, 2008, 179 (4), pp.383-395. 〈10.2113/gssgfbull.179.4.383〉</source>
<identifier>DOI : 10.2113/gssgfbull.179.4.383</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.2113/gssgfbull.179.4.383</relation>
<language>en</language>
<subject lang=en>Panjal Traps</subject>
<subject lang=en>Continental flood basalts</subject>
<subject lang=en>Geochemistry</subject>
<subject lang=en>Neotethys</subject>
<subject lang=en>Rifting</subject>
<subject>[SDU.STU.PE] Sciences of the Universe [physics]/Earth Sciences/Petrography</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>The late Lower to Middle Permian Panjal Traps (NW Himalaya, India-Pakistan) represent the greatest magmatic province erupted on the northern Indian platform during the Neotethys opening. New geochemical and isotopic analyses were performed on basalts from the eastern borders of the traps (SE Zanskar-NW Spiti area) in order to characterize this volcanism, to discuss its compositional variations in comparison to Panjal counterparts and its relationships with the opening of Neotethys. Lavas show features of tholeiitic low-Ti (< 1.6%) continental flood basalts with LREE, Th enrichments and Nb-Ta negative anomalies. Trace element ratios combined with {varepsilon}Ndi values (–3.6 to +0.9) and high Pb isotopic ratios suggest that these tholeiitic basalts were derived from an OIB-like mantle contaminated at various degrees by a continental crust component. Previous geochemical features are broadly similar to those of the coeval Panjal volcanic sequences identified westwards (Ladakh, Kashmir and Pakistan). Present geochemical constraints obtained for the Panjal Traps basalts suggest they originated from rapid effusion of tholeiitic melts during opening of the Neotethys Ocean. Similar magmatism implying an OIB-type reservoir is contemporaneously recognized on and along the adjacent Arabian platform. Both Indian and Arabian Permian volcanics were emplaced during coeval syn-rift to post rift transition. These Lower to Middle Permian south Neotethyan continental flood magmatism are regarded as associated to a passive rifting. In this scheme, OIB-type isotopic signature would be related either to a melting episode of syn-rift up-welling mantle plumes or to a melting of a regional abnormally hot and enriched mantle.</description>
<date>2008-07-25</date>
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