The tectonic stress field and deformation pattern of northeast India, the Bengal basin and the Indo-Burma Ranges: A numerical approach

Islam, Shofiqul; Shinjo, Ryuichi; Kayal, J. R.

doi:10.1016/j.jseaes.2010.08.015

Cited by 17 publications

(5 citation statements)

References 42 publications

(49 reference statements)

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“…Apart from the above four boundary faults, SP is criss-crossed by several lineaments and faults trending in the N-S, E-W and NE-SW directions (Chattopadhyay & Hashimi, 1984). A few deep-rooted faults studied from the SP are N-S trending Nongchram Fault in the west, the NE-SW trending Barapani-Tyrsad shear zone in the centre, the N-S trending Um-Ngot lineament in the east, Chedrang, Raibah faults and Kopli lineaments related to Himalayan collision zone and Indo-Burma subduction zone (Islam et al, 2011a(Islam et al, , 2011bKayal, 2001;Kayal et al, 2006).…”

Section: Geological Settingmentioning

confidence: 99%

The Kerguelen mantle plume activity in Sylhet Trap mafic rocks of Southern Shillong Plateau, NE India: Implications for its role in magmatism of eastern India

Kumar,

Singh,

Bikramaditya

et al. 2024

Geological Journal

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Mantle plumes related to Large Igneous Provinces have been linked to continental break‐up and validated by the outpouring of mafic‐ultramafic magmas that range from continental flood basalt magmatism to submarine plateau volcanism. This study presents a new set of geochemical and mineralogical data on mafic magmatic rocks from the Sylhet Trap of the Shillong Plateau, northeast India. The investigated mafic rocks (basalt and dolerite) are predominantly sub‐alkaline‐tholeiitic, composed of bytownite+labradorite and diopside+augite, with ophitic to sub‐ophitic and glomeroporphyritic textures, the dark interstitial region of much finer grains consisting of opaque minerals and devitrified glass. The mafic rocks of Sylhet Trap show light rare earth elements enrichment with (La/Yb)N ratio (1.92–2.86) and (La/Sm)N ratio (1.11–1.40), an almost flat pattern of heavy rare earth elements along with mild europium anomalies (Eu/Eu*= 0.94–1.11). Trace element characteristics suggest their affinity towards enriched mid‐oceanic ridge basalt and generated from low degree of partial melting of spinel source with minor involvement of crustal contamination. The similarity in geochemical characteristics of the investigated mafic rocks with the magmatism of Rajmahal Traps, eastern Peninsular India, Abor Volcanics, eastern Himalaya, along with Bunbury Basalt of western Australia and Cona Mafic exposed in southeastern Tibet, suggests their genetic linkage with mantle plume activities. Thus, we argue that the magmatic event of the Sylhet Trap is related to the Kerguelen mantle plume activity that played a significant role in the fragmentation of eastern Gondwana during the Lower Cretaceous period, giving rise to Greater India, Antarctica and northwest Australia.

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Section: Geological Settingmentioning

confidence: 99%

The Kerguelen mantle plume activity in Sylhet Trap mafic rocks of Southern Shillong Plateau, NE India: Implications for its role in magmatism of eastern India

Kumar,

Singh,

Bikramaditya

et al. 2024

Geological Journal

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“…A 90-100km long stretch of NW-SE trended Dapsi thrust is considered to be the Dauki fault's northwest extension in the plateau, with the signature of strikeslip movement with reverse faulting component. 12 The Bengal basin's younger tertiary sediments are separated by the Dapsi thrust to the southwest of Shillong plateau from the rocky complex of the plateau itself in the northeast. 7,13 Mikir Hills is situated in the northeast end of Shillong massif, which is considered to be de-linked from the Shillong subcraton by the Kopili detachment fault.…”

Section: Tectonic Settingmentioning

confidence: 99%

Intra-Crustal Seismicity Triggering in Shillong Massif – An Appraisal on Recent Seismicity

Borgohain

2021

Curr. World Environ

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Shillong plateau in the North East India resembles a kind of inselberg, confined in between the great Hilamalayan mountain belts in the north and the Arakan-Yoma towards east. The study area is governed by a system of complex seismotectonic features responsible for the intense seismicity in the region, significantly the devastation aftermath the 1897 great Assam Earthquake (Ms~8.7). Spatio-temporal distribution of seismicity triggering inside the plateau from 1966 to 2013 suggests distinctly variable depth-ranges of seismicity zones within the crust. The depth section counterparts of the seismicity monitoring within Shillong plateau and its periphery infers the bottom of the seismogenic zone to lie at ~40km depth with an average depth of earthquake occurrence at 22.31km; besides, the study also dictates the dominant earthquake magnitude as ≤4.99Mw, wherein most of the earthquakes are confined within magnitude 3-5 Mw with an average magnitude 3.42 MW. The study reveals intense seismic activity in the central and western part of Shillong plateau owing to the conjecture of a number of active faults. The present study incorporates both qualitative as well as quantitative approach while understanding the types of recent seismicity pattern in the Shillong massif.

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“…One such event that fits the above observations is the intense tectonic activity during Late Miocene along the Dauki Fault that forms the northern boundary of the Bengal Basin (Figure 1). The Dauki Fault forms a major E-W reverse fault and accommodates about 25% of the stress due to Indian plate movement 23 resulting from N-S shortening between Indian craton and the Shillong block 24 . This N-S compression is probably transmitted as present-day regional state of stress (σH max ) oriented in a N-S to NNE-SSW direction, as computed from fault plane solutions of earthquakes affecting the study area [25][26][27] and maximum stress direction indicated in the World Stress Map 28 .…”

Section: Correlation Of Structural Trendsmentioning

confidence: 99%

Delineation of Subtle and Obscure Structures in West Bengal Shelf:A Remote Sensing and GIS-Based Parallel Approach

Mazumder¹,

Adhikari²,

Mitra³

et al. 2018

Current Science

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In the West Bengal part of the Bengal Basin, even after five decades of seismic-based hydrocarbon exploration no commercial finds have been identified. Deep drilling revealed the presence of hydrocarbon within the thick sedimentary sequence ranging from Gondwana to Recent. However, well-defined structures suitable for hydrocarbon pool in shallower sediments are apparently not visible in seismic data. In this article, a parallel approach to seismic exploration has been attempted to delineate shallow and subtle structures in the shelf area based on analysis of surface geomorphic data. The study identifies subtle structures in shallow sediments that entrap the remigrated hydrocarbons as well as envisages a multistoried, stacked model of hydrocarbon accumulations in the area. These areas are considered as promising targets and recommended for high-resolution seismic and close grid micro-gravity exploration survey for further detailing.

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The tectonic stress field and deformation pattern of northeast India, the Bengal basin and the Indo-Burma Ranges: A numerical approach

Cited by 17 publications

References 42 publications

The Kerguelen mantle plume activity in Sylhet Trap mafic rocks of Southern Shillong Plateau, NE India: Implications for its role in magmatism of eastern India

The Kerguelen mantle plume activity in Sylhet Trap mafic rocks of Southern Shillong Plateau, NE India: Implications for its role in magmatism of eastern India

Intra-Crustal Seismicity Triggering in Shillong Massif – An Appraisal on Recent Seismicity

Delineation of Subtle and Obscure Structures in West Bengal Shelf:A Remote Sensing and GIS-Based Parallel Approach

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