2D Electrical Conductivity Structure by Magnetotelluric Method Over Eastern Indian Craton
07 Jun 1999-
TL;DR: In this paper, remote reference magnetotelluric (MT) measurements were carried out over Eastern Indian craton and all the data were processed with hybrid robust technique using very fast simulated annealing (VFSA).
Abstract: Remote reference (RR) magnetotelluric (MT) measurements were carried out over Eastern Indian craton. All the data were processed with hybrid robust technique. A stitched section was prepared from 1-D MT inversion scheme using very fast simulated annealing (VFSA) technique which served as an input data for 2-D modelling. VFSA with splines bas been used for the 2-D inversion. 2-D subsurface conductivity model over the craton shows that the granitic crust is electrically homogenous with as high a resistivity as 30,000 ohm-m. Its depth extent is 38 km.
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TL;DR: In this paper, a magnetotelluric lithospheric study over the Eastern Indian Craton (3.3 Gyr) resolves the lower crust and upper mantle boundary due to the absence of highly conducting continental lower crust underneath the craton.
Abstract: [1] Moho boundary, discovered about a century back, is well established on the basis of seismological studies. Electromagnetic studies using very low frequencies, however, have not been able to establish this boundary due to the presence of highly conducting continental lower crust. Magnetotelluric lithospheric study over the Eastern Indian Craton (3.3 Gyr) resolves the lower crust and upper mantle boundary due to the absence of highly conducting continental lower crust underneath the craton. From the present study it can be speculated that a dynamics other than the plate tectonics possibly existed up to the mid-Archaean.
36 citations
TL;DR: In this paper, electrical anisotropy in the mantle underneath the Eastern Indian Craton (EIC) (∼3.3 Gyr) with relatively short-period ( 1 ǫ to N 25°W for frequency 1ǫ) indicate that the conductivity structure in the crust does not coincide with the mantle structure.
14 citations
Journal Article•
TL;DR: A comparative study of the Moho from magnetotelluric studies in the Eastern Indian Craton and Slave Craton, Canada is presented in this article, where the authors compare the two types of magnetic fields.
Abstract: A comparative study of the Moho from magnetotelluric studies in the Eastern Indian Craton and Slave Craton, Canada is presented in this note.
1 citations