The ophiolites of northeast India — a subduction zone ophiolite complex of the Indo-Burman orogenic belt

Bhattacharjee, C. C.

doi:10.1016/0040-1951(91)90057-y

Cited by 56 publications

(25 citation statements)

References 9 publications

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“…1A). Bhattacharjee (1991) interpreted MNOB as slices of oceanic crust and upper mantle obducted onto the Indian continental margin. The linear tract consists of a complex mixture of igneous and sedimentary rocks representing oceanic and lithospheric assemblages.…”

Section: Geology and Field Settingmentioning

confidence: 99%

“…Bhattacharjee (1991), based on radiolarian fossils (Nassellaria), assigned the age of the MOC chert as Early to Middle Cretaceous. Based on integrated coccolith-globotruncanid biostratigraphy of limestone blocks of the MOC, Chungkham and Jafar (1998) also suggest that initial rifting and creation of the IndoMyanmar Ocean took place prior to the Late Santonian time.…”

Section: Tectonic Evolution Of Moc Serpentinitementioning

confidence: 99%

“…Another school believed that the MNOB is rootless sub-horizontal bodies, which are westward-propagated nappes from the Eastern Belt Ophiolite of Myanmar Acharyya et al, 1990). Another theory also believed that the belt originated in an Island Arc developed in the Tethyn Ocean (Bhattacharjee, 1991;Nandy, 2001). Furthermore, due to remote and inaccessible nature of the terrain, very less research work has been done in the area.…”

Section: Introductionmentioning

confidence: 99%

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Origin and serpentinization of ultramafic rocks of Manipur Ophiolite Complex in the Indo-Myanmar subduction zone, Northeast India

Ningthoujam

Dubey

Guillot

et al. 2012

Journal of Asian Earth Sciences

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Section: Geology and Field Settingmentioning

confidence: 99%

Section: Tectonic Evolution Of Moc Serpentinitementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Origin and serpentinization of ultramafic rocks of Manipur Ophiolite Complex in the Indo-Myanmar subduction zone, Northeast India

Ningthoujam

Dubey

Guillot

et al. 2012

Journal of Asian Earth Sciences

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“…It occurs within the NNE-SSW trending Indo-Myanmar Orogenic Belt (IMOB), a remnant of the Tethyan Ophiolite in the Alpine-Himalayan orogenic system [13][14][15][16] . Initially, it was proposed that several subduction processes were involved in the generation of this ophiolite belt resulting from the convergence of the Indian plate with the Myanmar plate 14,[17][18][19][20][21] . However, the tectonic processes involved in this are still controversial.…”

mentioning

confidence: 99%

Mineralogy of the Manipur Ophiolite Belt, North East India:Implications for Mid-Oceanic Ridge and Supra-Subduction Zone Origin

Ovung¹,

Ray²,

Teng³

et al. 2017

Current Science

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Mineralogical studies on the mantle and crustal sections of the Manipur Ophiolite Belt (MOB) lead to important findings pertaining to its genesis and controlling tectonic milieu. The wide compositional gap in the Cr# and Mg# content of spinel in the mantle peridotites of MOB implies upper mantle melting in two different tectonic settings. The tectonic discrimination diagrams based on spinel chemistry indicate a midoceanic ridge (MOR) origin for the high-Al spinel peridotites and a supra-subduction zone origin for the high-Cr spinel peridotites. The pyroxenite mantle dyke, ultramafic cumulate and pillow-basalt record temperature in the range of 600-1030C, 600-800C and 700-1005C respectively. Plotting of clinopyroxene composition of pillow-basalt in the TiO 2 -Na 2 OSiO 2 /100 (wt%) tectonic discrimination diagram, implies a subduction-related origin of the basalts. Experimental studies on the serpentine stability indicate that it was dominantly affected by high temperaturelow deformation setting.

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“…This process that began during the Alpine orogenesis has caused the development of a relatively immature, mountainous terrain that is tectonically complicated. Evidences indicate continuing subduction (Nandy 1976;Verma 1985;Bhattacharjee 1991).…”

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confidence: 99%

Instability analyses of Merhülietsa slide, Kohima, Nagaland

et al. 2011

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Part of Merhülietsa colony of Kohima town and the national highway passing through it was devastated by a landslide on May 13, 2007. This unstable zone affected by rotational failure lies in the Disang sediments comprising shale with intercalations between thin-bedded siltstone and fine-grained sandstone. The shales are sheared, crumpled, and weathered to a high degree. This is attributed to a strike-slip fault and two shear fractures. Geotechnical analysis was carried out in the area and a factor of safety of 0.60 obtained for the slide mass. Similar work is extended to the surrounding area which had developed tension fractures. A slip circle drawn from tension cracks helps define future failure planes. A factor of safety of 0.93 is obtained indicating the possibility of progression of the slide zone. Rock mass rating of the shales surrounding the slide zone indicates poor rock condition, pointing to danger of collapse with further progression of the slide zone.

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The ophiolites of northeast India — a subduction zone ophiolite complex of the Indo-Burman orogenic belt

Cited by 56 publications

References 9 publications

Origin and serpentinization of ultramafic rocks of Manipur Ophiolite Complex in the Indo-Myanmar subduction zone, Northeast India

Origin and serpentinization of ultramafic rocks of Manipur Ophiolite Complex in the Indo-Myanmar subduction zone, Northeast India

Mineralogy of the Manipur Ophiolite Belt, North East India:Implications for Mid-Oceanic Ridge and Supra-Subduction Zone Origin

Instability analyses of Merhülietsa slide, Kohima, Nagaland

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