By Naresh Chandra Ghose, Nilanjan Chatterjee, Fareeduddin
The e-book is a considerate dialogue with scientists learning convergent plate obstacles resembling the well known, lively India-Eurasia collision area. It offers a complete number of petrographic photographs of ophiolitic rocks exhumed from oceanic lithosphere and mantle on the India-Asia plate boundary. Ophiolite is uncovered within the northwestern Himalayas, jap Indian plate margin and Andaman-Nicobar Islands. on the japanese margin, it happens in a slim strip comprising mantle peridotite tectonite, cummulate peridotite-gabbro-plagiogranite-anorthosite, mafic dyke, volcanics and oceanic sediments. Low temperature/high strain rocks together with blueschists and eclogites have been commonly studied lately. Ophiolite derived sediments and podiform chromites may also be mentioned to supply whole info. Supplemental maps, geological sections, box sketches and pictures will clarify the constitution, stratigraphy, ore mineralization, and metamorphic history.
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Extra info for A Petrographic Atlas of Ophiolite: An example from the eastern India-Asia collision zone
Porphyritic pillow and massive olivine basalts with intersertal to intergranular texture: • Phenocrysts are partially replaced by albite or chlorite. • Secondary veins and amygdules of carbonate, quartz and chlorite. 8 Saga and Sangsang Lherzolite and harzburgite: • Serpentinised near faults or shear zones. • Large olivine and pyroxene grains show minor folds or kinks and undulatory extinction: mantle deformation. • Olivine inclusions in pyroxene, minor euhedral spinel. • Recrystallised, interstitial olivine around clinopyroxene, olivine ?
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Etc. , etc. Low-plunging open folds with subangular hinge Schuppen structure in the northeastern IMR Shallow marine Middle to Upper Miocene Upper Disang Flysch: Shale passing into slate alternating with sandstone. Presence of mega cross-bed, load cast, slumping structure and olistoliths. , Ammodiscus, Trochamnina,Eggralla, Rubulus and Bullimina Three generations of folds: F1 and F2 are co-axial and co-planar flexure slip folds formed due to E-W or ESE-WNW compression. , etc. , etc Late Jurassic to Eocene K-Ar age of basalt: 148 ± 4 Ma (Sarkar et al.
A Petrographic Atlas of Ophiolite: An example from the eastern India-Asia collision zone by Naresh Chandra Ghose, Nilanjan Chatterjee, Fareeduddin