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The Carboniferous Baralacha La basaltic dykes (Upper Lahul, Ladakh) : remnants of an early rifting event along the Indian northern plate

¹ Lab. Géodynamique des Chaînes Alpines, UMR-CNRS 5025, Univ. Joseph Fourier, Géosciences, B.P. 53, 38041 Grenoble cedex, France
² Lab. Tectonophysique, UMR-CNRS 5568, Institut des Sciences de la Terre, de l’Eau et de l’Espace de Montpellier, Univ. Montpellier 2, Place Eugène bataillon, 34095 Montpellier cedex 05, France.
³ Lab. Pétrologie magmatique, Faculté des Sciences de St Jérôme, case courrier 441, 13397 Marseille cedex 20.
⁴ Institute of Mineralogy and Geochemistry, BFSH-2, University of Lausanne, CH-1015 Lausanne.
⁵ Lab. Mécanismes de Transferts en Géologie, UMR-CNRS 5563, Unité mixte de recherche, Centre National de la Recherche Scientifique, Université Paul Sabatier, 38 rue des 36 ponts, 31400 Toulouse, France.
⁶ Lab. Domaines océaniques, UMR-CNRS 6538, Univ. Bretagne Occidentale, Place Nicolas Copernic, 29280 Plouzané, France

The Lower Carboniferous Baralacha La basaltic dykes were emplaced along transtensional faults. The basalts exhibit tholeiitic and alkaline affinities. The tholeiites are TiO₂-poor, moderately enriched in light rare earth (LREE), and display Nb and Ta negative and Th positive anomalies. The alkali basalts, compared to the tholeiites, have higher TiO₂, rare earth and highly incompatible trace element contents and greater LREE enrichments. The Nd and Pb isotope compositions of the Baralacha La basalts suggest that they derive from the partial melting of an enriched OIB mantle source, characterized by a HIMU component, and contaminated by the lower continental crust. The Baralacha La dyke swarm represent the remnants of an early rifting event on the northern Indian passive margin.

Key Words: Within-plate volcanism • Geochemistry • Crustal contamination • Indian northern margin • Ladakh

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