By Naresh Chandra Ghose, Nilanjan Chatterjee, Fareeduddin
The e-book is a considerate dialogue with scientists learning convergent plate barriers comparable to the well known, lively India-Eurasia collision area. It presents a complete number of petrographic photos 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 slender 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 largely studied lately. Ophiolite derived sediments and podiform chromites can also be mentioned to supply whole information. Supplemental maps, geological sections, box sketches and images will clarify the constitution, stratigraphy, ore mineralization, and metamorphic history.
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Additional info for A Petrographic Atlas of Ophiolite: An example from the eastern India-Asia collision zone
In these horizons suggests an Eocene age (Ranga Rao 1983). The Jopi/Phokphur Formation is thus correlatable with the Mithakhari Group of the Andaman-Nicobar Islands (Bandyopadhyay et al. 1973; Vohra et al. 1989) and the Indus Group of the Indus Suture Zone (Srikantia and Razdan 1980). 1. 3 Geological Setting and Stratigraphy 33 Fig. 1 Ultramafic Rocks and Cumulate Complexes Peridotite Tectonite Peridotite, an olivine-pyroxene bearing rock, constitutes an integral part of the NHO. Peridotite tectonite at the base of the ophiolite sequence originated through deformation, plastic flow and shearing as part of the ocean floor was detached from the oceanic lithosphere.
J Geol Soc India 73:213–219 Mitchell AHG (1993) Cretaceous-Cenozoic tectonicevents in the western Myanmar (Burma)-Assam region. J Geol Soc Lond 150:1012–1089 Mitchell AHG, Htay MT, Htun KM, Win MN, Oo T, Hlaing T (2007) Rock relationships in the Mogok metamorphic belt, Tatkon to Mandalay, central Myanmar. J Asian Earth Sci 29:891–910 Mukasa SB, Ludden JN (1987) Uranium–lead isotopic ages of plagiogranites from the Troodos ophiolite, Cyprus, and their tectonic significance. Geology 15:825–828 Nicolas A, Girardeau J, Marcoux J, Dupré B, Wang X, Cao Y, Zheng H, Xiao X (1981) The Xigaze ophiolite (Tibet): a peculiar oceanic lithosphere.
The sequence could be termed as volcaniclastic (Agrawal 1985), instead of pyroclastic (Chattopadhyay et al. 1983). They grade upward into grit-lithic greywackesiltstone-sandstone-shale/tuff. A 30-m-thick conglomerate bed is exposed at Pungro-Phokphur road at the cross section with Mukoge rivulet in the northern part of NHO (Singh 1979). It consists of angular to subrounded boulders, cobbles and pebbles embedded in tuffaceous shale. 3 Geology of the Naga Hills Ophiolite The sandstone and shale exhibit similar composition of clast and matrix.
A Petrographic Atlas of Ophiolite: An example from the eastern India-Asia collision zone by Naresh Chandra Ghose, Nilanjan Chatterjee, Fareeduddin