Geochemical Characterization of Serpentinized Peridotites from the Shergol Ophiolitic Slice along the Indus Suture Zone (ISZ), Ladakh Himalaya, India

2017/07/14 by Irfan Maqbool Bhat, Talat Ahmad, D. V. Subba Rao
Earth and Planetary Sciences · #Geological and Geochemical Analysis #earthquake and tectonic studies #High-pressure geophysics and materials

paper · doi:10.1086/692653

Abstract

The Shergol ophiolitic slice is a dismembered ophiolite consisting predominantly of serpentinized peridotites along the Indus Suture Zone, Ladakh Himalaya, India. On the basis of modal mineralogy, Shergol serpentinized peridotites can be identified as spinel-bearing harzburgites. The characteristic U-shaped rare earth element (REE) patterns and whole-rock heavy-REE concentrations correspond to those of abyssal mantle rocks from mid-ocean ridges. Evaluation of Cr-spinel mineral chemistry reveals that they represent the residues left after low-to-moderate degrees of partial melting (<15%) in the spinel stability field in a mid-oceanic ridge tectonic environment. The whole-rock geochemistry suggests that the studied rocks represent a mantle residue left after removal of basaltic melts in the context of an ancient Jurassic-Cretaceous Neo-Tethys oceanic mantle section.

Citations

• Chromian spinel as a petrogenetic indicator in abyssal and alpine-type peridotites and spatially associated lavas
• The composition of the Earth
• Bulk-rock Major and Trace Element Compositions of Abyssal Peridotites: Implications for Mantle Melting, Melt Extraction and Post-melting Processes Beneath Mid-Ocean Ridges
• Peridotites from the Izu-Bonin-Mariana Forearc (ODP Leg 125): Evidence for Mantle Melting and Melt-Mantle Interaction in a Supra-Subduction Zone Setting

Related

• Petrology, geochemistry and petrogenesis of the dykes from the Zhob Ophiolite, Pakistan
• Multiple mantle sources of the Early Permian Panjal Traps, Kashmir, India
• Petrology and Trace Element Budgets of High-pressure Peridotites Indicate Subduction Dehydration of Serpentinized Mantle (Cima di Gagnone, Central Alps, Switzerland)
• Bulk-rock Major and Trace Element Compositions of Abyssal Peridotites: Implications for Mantle Melting, Melt Extraction and Post-melting Processes Beneath Mid-Ocean Ridges
• Xonotlite and pectolite in rodingites from the Samail ophiolite: Markers of reducing conditions and element transfer during peridotite-gabbro interaction