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 resembling the well known, lively India-Eurasia collision quarter. It offers a accomplished selection 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 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 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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1996) Paleomagnetic age of basalt: 70 ± 5 Ma (Patil et al. ) Nimi Formation/ Naga Metamorphics …………Unconformity………….. Shelf sediments: Predominantly sandstone. Tectonic Contact…………. Late felsic intrusive; Pelagic oceanic sediments: feebly metamorphosed tuff, pelitic-psammitic-calcareouscarbonaceous sediments and chert containing radiolaria, and coccoliths; Mafic/intermediate volcanics: basalts, minor andesite and trachyte, volcaniclastics and ignimbrite; Metabasics : zeolite- prehnitegreenschist facies, High-P/low-T blueschists and barroisite eclogite, and Meta-chert: containing blue amphibole and magnetite; Cummulate maficultramafic rocks: peridotite, pyroxenite, gabbroids, plagiogranite and anorthosite; dolerite (minor); peridotite tectonites and spinel peridotites; Serpentinite and Rodingite.

The metasediments are affected by tight isoclinal folding with steep axial planes dipping 80–85° towards SSE and show development of slaty cleavage and stripping lineation (Vidyadharan et al. 1986). Tectonically, the metasedimentary rocks can be considered as an accretionary prism complex which has possibly developed on an east-dipping subduction zone (Roy 1989) and has progressively accreted onto the overriding continental margin in western Myanmar. 2 The Ophiolite Suite The NHO is exposed as a long arcuate belt with tectonic contacts on either side.

Chem Geol 214:287–308 Enami M, Ko ZW, Win A, Tsuboi M (2012) Eclogite from the Kumon range, Myanmar: petrology and tectonic implications. Gondwana Res 21:548–558 Gansser A (1964) Geology of the Himalayas. Wiley Interscience, London 289 p Gansser A (1980) The significance of the Himalayan suture zone. Tectonophysics 62:37–52 Garzanti E, Sciunnach D, Gaetani M, Corfield RI, Watts AB, Searle MP (2005) Discussion on subsidence history of the north Indian continental margin, Zanskar–Ladakh Himalaya, NW India.

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