Magnetotelluric evidence for an Archaean – Proterozoic lithospheric assemblage within the Cambay rift basin, western India, and its role in channeling of plume-derived fluids within the basin

Danda, Nagarjuna; Rao, C. K.; Pavankumar, G.; Kumar, Amit; Manglik, A.

doi:10.1016/j.tecto.2021.229064

Cited by 2 publications

(1 citation statement)

References 79 publications

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“…This electrical resistivity, measured by comparing the electric field's horizontal component to the magnetic field on the surface, can detect a depth of several tens of kilometers associated with the acquisition frequency. With the rapid advancement in magnetotelluric modeling and inversion, it has become one of the essential tools for recognizing deep geological structures (Unsworth, 2010;Avdeeva et al, 2012;Azeez et al, 2017;Nagarjuna et al, 2021) and geophysical investigations, such as geothermal exploration (Barcelona et al, 2013;Patro, 2017;Tarek et al, 2023), mineral deposit exploration (Benjamin et al, 2018;Jiang et al, 2022), and gas exploration (Zhang et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

An efficient spectral element method for two-dimensional magnetotelluric modeling

2023

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We introduce a new efficient spectral element approach to solve the two-dimensional magnetotelluric forward problem based on Gauss–Lobatto–Legendre polynomials. It combines the high accuracy of the spectral technique and the perfect flexibility of the finite element approach, which can significantly improve the calculation accuracy. This method mainly includes two steps: 1) transforming the boundary value problem in the partial differential form into the variational problem in the integral form and 2) solving large symmetric sparse systems based on the combination of incomplete LU factorization and the double conjugate gradient stability algorithm through the spectral element with quadrilateral meshes. We imply the spectral element method on a resistivity half-space model to obtain a simple analytical solution and find that the magnetic field solutions simulated by the spectral element approach matched closely to the exact solutions. The experiment result shows that the spectral element solution has high accuracy with coarse meshes. We further compare the numerical results of the spectral element, finite difference, and finite element approaches on the COMMEMI 2D-1 and smooth models, respectively. The numerical results of the spectral element procedure are highly consistent with the other two techniques. All these comparison results suggest that the spectral element technique can not only give high accuracy for modeling results but also provide more detailed information. In particular, a few nodes are required in this method relative to the finite difference and finite element methods, which can decrease the relative errors. We then deduce that the spectral element method might be an alternative approach to simulate the magnetotelluric responses in two- or three-dimensional structures.

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Section: Introductionmentioning

confidence: 99%

An efficient spectral element method for two-dimensional magnetotelluric modeling

2023

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A Field Based Perspective of the Volcanism in Tadpatri Formation of Proterozoic Cuddapah Basin, India: An Analog of the Deccan Traps?

De,

Ray,

Dey

et al. 2023

Journal of the Geological Society of India

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Field studies around Pulivendla (14º33'36"N: 78º19'48"E) belonging to the Tadpatri Formation of Proterozoic Cuddapah Basin document three distinct lava flows (based on internal layering), associated sediments (shale and sandstone) and intrusive dyke-sill system. The presence of previously undocumented internal layering namely Lower Vesicular Zone (LVZ), Lower Colonnade Zone (LCZ), Entablature Zone (EZ), Upper Colonnade Zone (UCZ) and Upper Vesicular Zone (UVZ) helps to delineate three lava flows in the study area. The associated sedimentary beds either correspond to lava cessation-period or dynamic lava-sediment interaction due to lava-cascading. The present study in Tadpatri Formation reveals volcano-sedimentological features analogous to that of Deccan Traps. It is postulated that magmatism within Tadpatri Formation might have been largely controlled by Proterozoic syn-rift plume activity (needs further corroboration by high precision major/trace/isotopic analyses).

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Magnetotelluric evidence for an Archaean – Proterozoic lithospheric assemblage within the Cambay rift basin, western India, and its role in channeling of plume-derived fluids within the basin

Cited by 2 publications

References 79 publications

An efficient spectral element method for two-dimensional magnetotelluric modeling

An efficient spectral element method for two-dimensional magnetotelluric modeling

A Field Based Perspective of the Volcanism in Tadpatri Formation of Proterozoic Cuddapah Basin, India: An Analog of the Deccan Traps?

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