Origin and evolution of Suru Valley ophiolite peridotite slice along Indus suture zone, Ladakh Himalaya, India: Implications on melt-rock interaction in a subduction-zone environment

Bhat, Irfan Maqbool ; Ahmad, Talat ; Subba Rao, D.V. (2019) Origin and evolution of Suru Valley ophiolite peridotite slice along Indus suture zone, Ladakh Himalaya, India: Implications on melt-rock interaction in a subduction-zone environment Geochemistry, 79 (1). pp. 78-93. ISSN 00092819

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Official URL: http://doi.org/10.1016/j.chemer.2018.10.003

Related URL: http://dx.doi.org/10.1016/j.chemer.2018.10.003

Abstract

In this paper, we present whole-rock and mineral geochemistry of serpentinized peridotites from the Suru Valley ophiolite slice Ladakh Himalaya, in an attempt to put constraints on their petrogenesis and tectonic evolution in the context of Mesozoic Neo-Tethys Ocean. On the basis of petrographic study, Suru Valley serpentinized peridotites can be identified as serpentinized harzburgites. Relative to primitive mantle these rocks have depleted major and rare earth element (REE) geochemical characteristics comparable to ocean floor mantle rocks reflecting their mantle residual nature. However, higher abundance of highly incompatible large ion lithophile elements (e.g., Rb, Ba, Th, U, Pb and Sr), reflect metasomatism in a subduction zone environment. The presence of silicate assemblage includes Mg-rich olivine (Fo90-92) and orthopyroxene (En91-93 Fs6.4-8.7) of supra-subduction zone affinity. Evaluation of mineral and whole-rock geochemistry suggests that the Suru Valley ophiolitic peridotites represent residues left after moderate degrees of partial melting thereby underwent metasomatism in a supra-subduction zone environment related to north dipping intra-oceanic island arc during Cretaceous in the context of Mesozoic Neo-Tethys ocean.

Item Type:Article
Source:Copyright of this article belongs to Elsevier GmbH
Keywords:Indus suture zone, Suru Valley ophiolite, Cr-spinel
ID Code:129790
Deposited On:25 Nov 2022 10:33
Last Modified:25 Nov 2022 10:33

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