Geodynamic evolution of the Tethyan lithosphere as recorded in the Spontang Ophiolite, South Ladakh ophiolites (NW Himalaya, India)

نویسندگان

چکیده

The Spontang Ophiolite complex represents the most complete ophiolite sequence amongst South Ladakh ophiolites and comprises mantle rocks (depleted harzburgites, dunites minor lherzolites) as well crustal (basalt, isotropic gabbros, layered gabbros etc.). In present study, detailed geochemistry (whole rock mineral chemistry) Sr-Nd isotopic analyses of thirty-six ultramafic- mafic samples have been attempted to constraint evolution petrogenetic history Tethyan oceanic crust. Major, trace-element REE patterns peridotites their minerals indicate that lherzolites experienced lower degrees partial melting resembling abyssal (at higher temperatures, TREE = ∼1216 °C) than harzburgites (6%–8% versus 15%–17%). Elevated εNd(t) variable 87Sr/86Sr(t) ratios along with suggest display N-MORB affinity negligible participation sediments in genesis are originated from a depleted upper little contribution subduction-related fluids. MORB-type Neotethyan crust is associated earliest phase subduction (of older Jurassic age) through which younger intra-oceanic island arc (Spong arc) subsequently developed. Harzburgites typical U-shaped patterns, suggesting these metasomatized by LREE-enriched On other side, characterized heterogeneous (Nb/La)PM (Hf/Sm)PM relatively homogeneous εNd(t), indicating interaction melts during initiation subduction, Early Cretaceous times.

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ژورنال

عنوان ژورنال: Geoscience frontiers

سال: 2022

ISSN: ['2588-9192', '1674-9871']

DOI: https://doi.org/10.1016/j.gsf.2021.101297