A Petrographic Atlas of Ophiolite: An example from the by Naresh Chandra Ghose, Nilanjan Chatterjee, Fareeduddin

By Naresh Chandra Ghose, Nilanjan Chatterjee, Fareeduddin

The booklet is a considerate dialogue with scientists learning convergent plate barriers akin to the well known, energetic India-Eurasia collision area. It offers a accomplished 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, japanese 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 generally studied lately. Ophiolite derived sediments and podiform chromites can 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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Geological Survey of Pakistan, Quetta, 215–242 Arif M, Jan Q (2006) Petrogenetic significance of the chemistry of chromite in the ultramafic–mafic complexes. J Asian Earth Sci 27:628–646 Asrarullah AZ, Abbas SG (1979) Ophiolites in Pakistan: introduction. In: Farah A, Dejong KA (eds) Geodynamics of Pakistan. 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.

2010). Chromite compositions, oxygen fugacity values and trace element compositions of the mantle peridotite units indicate formation of the ophiolite at a mid-oceanic ridge or a suprasubduction zone spreading centre (Pal 2011). However, the upper crust in the southern part also contains andesite and dacite, which suggests that arc-related crust is built on top of the MORB-type oceanic crust (Pedersen et al. 2010). The mantle tectonites are serpentinised and crudely foliated. The orthopyroxene porphyroclasts (En87–88) with olivine (Fo89–94) and chromite inclusions are resorbed and surrounded by olivine neoblasts (Pal 2011).

Mitchell, personal communication). The Jopi/Phokphur Formation is characterised by (a) post-orogenic deposition (with post-F1 folding) followed by late marine transgression, (b) irregular current bedding, (c) dominance of sandstone, (d) rarity of limestone, (e) weak metamorphism at the base and (f) terrestrial and marine fossils of plants, invertebrate and foraminifera. The different tectonic levels of the formation show different degrees of deformation and metamorphism. The weakly metamorphosed units in the lower part of the sequence show alternation of slate and phyllite with quartzite, whereas uppermost units are unmetamorphosed (Vidyadharan et al.

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