Palaeocurrent and environmental implications from anisotropy of magnetic susceptibility (AMS): a case study from Talchir and Barakar formations, Raniganj Basin, West Bengal, India

Chatterjee, Saurodeep; Mondal, Supriya; Paul, Pritam; Das, Pritwish

doi:10.1007/s12517-018-3644-x

Cited by 3 publications

(2 citation statements)

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“…The AMS of a rock sample corresponds to a symmetric, second-rank tensor that can be described by a triaxial ellipsoid with principal eigenvectors K max > K int > K min representing the maximum, intermediate and minimum susceptibility axes respectively of the tensor ellipsoid 24 . The AMS technique has been widely used in geological science to evaluate the orientation of mineral fabric in igneous rocks or structurally deformed rocks [25][26][27][28][29][30] , naturally deposited soft-sediments [31][32][33][34][35][36][37][38][39][40][41][42][43][44] and in laboratory deposited sediments [45][46][47] .…”

Section: Methodsmentioning

confidence: 99%

“…Following the pioneering laboratory experiment 45 , several authors [36][37][38][39][40]43,44 applied these AMS techniques to study paleo-current directions in sedimentary rocks, especially in sediments of appropriate grain size. As the orientation of AMS ellipsoid in sedimentary environment is controlled by the direction and velocity of water flow 47 , this technique can be efficiently used to evaluate the palaeo-velocity of Tirna River because the main flow direction of this river is known to be dominantly eastward (Fig.…”

Section: Methodsmentioning

confidence: 99%

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Effects of Killari earthquake on the paleo-channel of Tirna River Basin from Central India using anisotropy of magnetic susceptibility

Lakshmi

Deenadayalan

Gawali

et al. 2020

Sci Rep

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The Killari Earthquake (Moment magnitude 6.1) of September 30, 1993, occurred in the state of Maharashtra, India, has an epicenter (18°03′ N, 76°33′ E) located at ~ 40 km SSW of Killari Town. The ~ 125 km long basin of Tirna River, close to the Killari Town, currently occupies the area that has witnessed episodic intra-cratonic earthquakes, including the Killari Earthquake, during last 800 years. The anisotropy of magnetic susceptibility (AMS) study was performed on ~ 233 soft sedimentary core samples from six successions located in the upper to lower stream of the Tirna River basin in the present study in order to evaluate the effects of earthquake on the river flow dynamics and its future consequence. The AMS Kmax orientations of the samples from the upper reach of the river section suggest that the sedimentation in this part of the river was controlled by a N–S to NNW–SSE fluvial regime with a low or medium flow velocity. In the middle reaches of the basin, an abrupt shift in the palaeo-flow direction occurred to W–E with low velocity flow. However, a NW–SE higher palaeo-flow regime is identified in the following central part of the basin in down-stream direction, followed by a low-velocity palaeo-flow regime at the lower reach of the Tirna basin. We attribute the sudden high flow velocity regime in the central part of the river basin to an enhanced gradient of the river that resulted from the reactivation of a NW–SE fault transecting the Tirna River basin at the Killari Town. As the NW–SE faulting in regional scale is attributed as the main cause of Killari Earthquake, the reactivation of this fault, thus, could enhance the further possibility of an earthquake in near future, and hence leading to devastating flood in the almost flat-lying downstream part of the Tirna River.

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