Read e-book online A Petrographic Atlas of Ophiolite: An example from the PDF

By Naresh Chandra Ghose, Nilanjan Chatterjee, Fareeduddin

ISBN-10: 8132215680

ISBN-13: 9788132215684

ISBN-10: 8132215699

ISBN-13: 9788132215691

The publication is a considerate dialogue with scientists learning convergent plate limitations comparable to the well known, energetic India-Eurasia collision area. It offers 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 jap 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 commonly studied lately. Ophiolite derived sediments and podiform chromites can also be mentioned to supply entire 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

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They show strong CaO enrichment and severe depletion of MgO from the host peridotites and resemble meta-rodingite formed through extensive Ca metasomatism during serpentinisation of the host rocks followed by high pressure recrystallisation (Evans et al. 1979). The mafic differentiates are represented by rodingitised gabbros and plagiogranite. The volcanic rocks include massive amygdaloidal basalts with low MgO that show intersertal and glomeroporphytitic texture and agglomerate. The eastern margin of ophiolite in Manipur exposes oceanic pelagic cover sediments metamorphosed to a low grade.

A detailed description of the different lithologies of the NHO is presented in Sects. 9. basin/continental margin. Despite their large thickness, fossils are rare in the Disang sediments. A limited number of bivalves, gastropods and foraminifera are reported that suggests an Upper Cretaceous-Eocene age of their deposition (Acharyya et al. 1986). 5 km in the upper part of the Disang Formation (Joshi and Vidyadharan 2008). A mélange zone of folded olistostromal limestone in the upper part of the formation extends from Lambui in the south, through Ukhrul and Paoyi in Manipur (Mitra et al.

It is overlain by strain free cumulate sequence of the layered complexes that formed through fractionation in magma chamber. The tectonites are represented in the NHO by dunite, harzburgite, lherzolite and minor wehrlite, comparable to seismic Layer-4 of the oceanic crust. 3 km), (b) dunite and harzburgite—2 km southeast of Zipu and (c) a very small body of lherzolite close to Zintang ti rivulet in the central part of the ophiolite belt (Agrawal and Ghose 1986). They contain resorbed or euhedral to anhedral grains of dark coloured opaques or deep brown high-Cr chrome spinel.

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A Petrographic Atlas of Ophiolite: An example from the eastern India-Asia collision zone by Naresh Chandra Ghose, Nilanjan Chatterjee, Fareeduddin


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