By Naresh Chandra Ghose, Nilanjan Chatterjee, Fareeduddin
The publication is a considerate dialogue with scientists learning convergent plate barriers resembling the well known, energetic India-Eurasia collision area. It offers a complete selection 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, japanese 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 generally studied lately. Ophiolite derived sediments and podiform chromites can also be mentioned to supply whole information. Supplemental maps, geological sections, box sketches and pictures will clarify the constitution, stratigraphy, ore mineralization, and metamorphic history.
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Additional resources for A Petrographic Atlas of Ophiolite: An example from the eastern India-Asia collision zone
Geology 18:439–442 Sharma KK, Sinha AK, Bagdasarian GP, Gukasian P (1979) Potassium-argon dating of Dras volcanics. Shyok volcanics and Ladakh granite, Ladakh, Northwest Himalaya. In: Nautiyal SP (ed) Himalayan geology. Wadia Institute of Himalayan Geology, vol 8. Hindustan Publishers, New Delhi, pp 288–295 Shi G, Cui W, Cao S, Jiang N, Jian P, Liu D, Miao L, Chu B (2008) Ion microprobe zircon U–Pb age and geochemistry of the Myanmar jadeitite. J Geol Soc Lond 165:221–234 Singh AK, Singh RKB (2011) Zn- and Mn-rich chrome-spinels in serpentinite of Tidding Suture Zone, Eastern Himalaya and their metamorphism and genetic significance.
The Andaman Ophiolite Group comprises subhorizontal thrust slices that form the basement on which Tertiary accretionary prism sediments were deposited (Sengupta et al. 1990). The ophiolite group is overlain by the Mithakhari Group containing polymictic conglomerate, sandstone, arkose, shale, foraminiferal limestone and pyroclasts in the upper part (Bandopadhyay 2011). The volcanic rocks of the Andaman Ophiolite belong to the tholeiitic series. Trace element and REE content of the hyaloclastites and pillow basalts are similar to MORB and indicate a back-arc environment (Jafri et al.
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. Dyke swarms are absent. 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.
A Petrographic Atlas of Ophiolite: An example from the eastern India-Asia collision zone by Naresh Chandra Ghose, Nilanjan Chatterjee, Fareeduddin