The elusive crustal resistive boundary beneath the Deccan Volcanic Province and the western Dharwar craton, India
Pratap, Akkapolu (Absolute Imaging International India Limited (Índia))
Bukke, Pradeep Naick (Electromagnetic Geophysics. CSIR-National Geophysical Research Institute)
Kusham, (Electromagnetic Geophysics. CSIR-National Geophysical Research Institute)
Paluri, Rama Rao (Andhra University)
Kasturi, Naganjaneyulu (Electromagnetic Geophysics. CSIR-National Geophysical Research Institute)

Fecha:	2023
Resumen:	The electrical properties of the boundary beneath the Deccan Volcanic Province and the western Dharwar craton are imaged by using the magnetotelluric method. The magnetotelluric study was carried out along a 150km long WNW-ESE profile from Belgaum (in the Deccan Volcanic Province) to Haveri (in the western Dharwar craton). Data from 19 magnetotelluric stations spaced 10-15km apart were used. The dominant regional geo-electric strike direction obtained is N20ºE. Two-dimensional (2-D) inversion is done by using the non-linear conjugate gradient scheme for both apparent resistivity and phase. The 2-D resistivity model shows a high electrical resistivity character (>10,000ohm-m) in the western Dharwar craton. Two conductive anomalies are mapped in the crustal region. In the WNW side of the profile, a conductive feature (~200ohm-m) is imaged in the mid-lower crust and, in the central part of the profile another conductive feature is mapped in the lower crust. The conductive features robustness is tested using linear and non-linear sensitivity analyses. The conductor mapped in the WNW part of the profile is considered as a deep seated fault representing a boundary or a rift related feature beneath the Deccan Volcanic Province and the western Dharwar craton. A zone of enhanced conductivity (<50ohm-m) at an approximate depth of 10-30km may represent the presence of the rift in the region. This conducting feature on the Western side of the E-W trending Kaladgi Basin can be interpreted as the extension of the Kaladgi Basin further west. A well-correlated geological cross-section is also derived to interpret the resistive features mapped in this study. The electrical resistivity nature of the crust is compared with other regions of the world.
Derechos:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan aquestes es distribueixin sota la mateixa llicència que regula l'obra original i es reconegui l'autoria de l'obra original.
Lengua:	Anglès
Documento:	Article ; recerca ; Versió publicada
Materia:	Crustal structure ; Deccan volcanic province ; Western dharwar craton ; Magnetotellurics ; Resistivity
Publicado en:	Geologica acta, Vol. 21 (2023) , p. 1-14 (Articles) , ISSN 1696-5728

Adreça original: https://raco.cat/index.php/GeologicaActa/article/view/414507
Adreça alternativa: https://revistes.ub.edu/index.php/GEOACTA/article/view/39418
DOI: 10.1344/GeologicaActa2023.21.2

14 p, 1.9 MB

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