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

By Naresh Chandra Ghose, Nilanjan Chatterjee, Fareeduddin

The e-book is a considerate dialogue with scientists learning convergent plate barriers corresponding to the well known, lively India-Eurasia collision region. It presents a complete 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 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 widely 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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2). 1), their inter-relationship, deformation pattern and metamorphism are presented below. 1 Fig. 2 Aerial view of ophiolite, Lacham Lake, Nagaland. Ch chert, Dm dunite tectonite, HG hornblende gabbro, G gabbro, L Lacham Lake, V volcanics, M Nimi Formation, Pv pelagic-volcanogenic sediments, S serpentinite, Sh schist, Um ultramafic and Cu–Mo coppermolybdenum mineralisation (Chattopadhayay et al. 1983; Acharyya et al. 1986; Chungkham and Jaffar 1998). The ophiolitic rocks in the Chin Hills, located south of the Naga Hills, are unconformably overlain by the Upper Albian limestones (Mitchell 1981).

3 Geological Setting and Stratigraphy 29 Fig. 4 Geological map of the northern part of ophiolite (sector I) around KiphirePokhphur (old Pukphur) (modified after Ghose and Singh 1981). g. Semail, Oman Mountains), it is evident from field disposition that a systematic order may have existed prior to their emplacement. The ophiolite litho-units may be broadly classified into (i) peridotite tectonite or meta-ultramafics, (ii) spinel peridotite (spinel-bearing dunite/harzburgite/lherzolite), (iii) cumulate mafic–ultramafic sequence (peridotite, pyroxenite, layered and massive gabbroids, plagiogranite and anorthosite), (iv) dolerite and meta-dolerite (minor), (v) volcanics and volcaniclastics and (vi) pelagic sediments.

2012) indicating that the oceanic crust generation may have continued until Late Cretaceous. 3 Fig. 2). 1), their inter-relationship, deformation pattern and metamorphism are presented below. 1 Fig. 2 Aerial view of ophiolite, Lacham Lake, Nagaland. Ch chert, Dm dunite tectonite, HG hornblende gabbro, G gabbro, L Lacham Lake, V volcanics, M Nimi Formation, Pv pelagic-volcanogenic sediments, S serpentinite, Sh schist, Um ultramafic and Cu–Mo coppermolybdenum mineralisation (Chattopadhayay et al.

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