By Naresh Chandra Ghose, Nilanjan Chatterjee, Fareeduddin
The e-book is a considerate dialogue with scientists learning convergent plate obstacles comparable to the well known, energetic India-Eurasia collision region. It offers a complete choice of petrographic pictures 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 jap 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 greatly studied lately. Ophiolite derived sediments and podiform chromites may also be mentioned to supply entire information. Supplemental maps, geological sections, box sketches and pictures will clarify the constitution, stratigraphy, ore mineralization, and metamorphic history.
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Extra resources for A Petrographic Atlas of Ophiolite: An example from the eastern India-Asia collision zone
Geological Survey of Pakistan, Quetta, 181–192 Ball V (1888) The volcanoes of Barren Island and Narcondam in the Bay of Bengal. Geol Mag 9:404–408 Bandopadhyay PC (2005) Discovery of abundant pyroclasts in the Namunagarh grit, South Andaman: evidence for arc volcanism and active subduction during the Palaeogene in the Andaman area. J Asian Earth Sci 25:95–107 Bandopadhyay PC (2011) Re-interpretation of the age and environment of deposition of paleogene turbidites in the Andaman and Nicobar Islands, Western Sunda Arc.
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.
Serpentinisation is ubiquitous, and both very-low (zeolite and chlorite-prehenite schists) to low-grade (greenschists) assemblages and high-P assemblages (blueschists and eclogite) occur in the NHO. 1). Some noteworthy petrographic features include the presence of—ocellus of chlorite in basalts, S-C mylonite in spinel peridotite and blueschist, glaucophane-fish in ultra-cataclastic blueschist leading to mortar texture and development of pseudo-tachylite vein, kink carbonate lamellae attached to quartz in pressure shadows in ignimbrite, and late metamorphic breakdown of clinopyroxene to form plagioclase with a rim of orthopyroxene in olivine-websterite.