Geochemistry of Dras volcanics and the evolution of the Indus Suture ophiolites

Radhakrishna, T. ; Divakara Rao, V. ; Murali, A. V. (1984) Geochemistry of Dras volcanics and the evolution of the Indus Suture ophiolites Tectonophysics, 108 (1-2). pp. 135-153. ISSN 0040-1951

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/004019...

Related URL: http://dx.doi.org/10.1016/0040-1951(84)90157-4

Abstract

The Indus Suture Zone, with many ophiolite occurrences, represents the northern limit of the Tethyan Himalaya. The volcanic rocks of the Dras ophiolite zone exhibit low TiO2, K2O, P2O5, SiO2, Pb, Rb, Ba, Sr and Zr concentrations and lower La/Yb ratios than the intraplate tholeiites. Intercalation of marine sediments, presence of pillow lavas, low K2O, low to moderate TiO2, high MgO, CaO/TiO2 and Al2O3, flat REE patterns with lower LaN/SmN ratios and increase of SiO2, FeO(T) and TiO2 with the fractionation indicate that they are island-arc tholeiites similar to lavas of late Cretaceous age in Cyprus and Oman. These volcanics are postulated to have been derived from a tholeiitic magma generated by a high degree of partial melting and fractionation of mafic phases prior to the crystallization of plagioclase. The island-arc tholeiitic volcanism, the lack of major CA volcanic activity and the reported blueschist metamorphism of the Indus ophiolites suggest a palaeo-island arc development along the Indus Suture Zone along which the Tethys oceanic crust was consumed.

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