Magnetotelluric investigation of lithospheric electrical structure beneath the Dharwar Craton in south India: Evidence for mantle suture and plume-continental interaction
Broad-band and long period magnetotelluric measurements made at 63 locations along ∼500 km long Chikmagalur-Kavali profile, that cut across the Dharwar craton (DC) and Eastern Ghat Mobile Belt (EGMB) in south India, is modelled to examine the lithosphere architecture of the cratonic domain and defin...
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| Format: | Article |
| Language: | English |
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Elsevier
2019-09-01
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| Series: | Geoscience Frontiers |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1674987118302445 |
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| author | D. Malleswari K. Veeraswamy K.K. Abdul Azeez A.K. Gupta Narendra Babu Prasanta K. Patro T. Harinarayana |
| author_facet | D. Malleswari K. Veeraswamy K.K. Abdul Azeez A.K. Gupta Narendra Babu Prasanta K. Patro T. Harinarayana |
| author_sort | D. Malleswari |
| collection | DOAJ |
| description | Broad-band and long period magnetotelluric measurements made at 63 locations along ∼500 km long Chikmagalur-Kavali profile, that cut across the Dharwar craton (DC) and Eastern Ghat Mobile Belt (EGMB) in south India, is modelled to examine the lithosphere architecture of the cratonic domain and define tectonic boundaries. The 2-D resistivity model shows moderately conductive features that intersperse a highly resistive background of crystalline rocks and spatially connect to the exposed schist belts or granitic intrusions in the DC. These features are therefore interpreted as images of fossil pathways of the volcanic emplacements associated with the greenstone belt and granite suite formation exposed in the region. A near vertical conductive feature in the upper mantle under the Chitradurga Shear Zone represents the Archean suture between the western and eastern blocks of DC. Although thick (∼200 km) cratonic (highly resistive) lithosphere is preserved, significant part of the cratonic lithosphere below the western DC is modified due to plume-continental lithosphere interactions during the Cretaceous–Tertiary period. A west-verging moderately conductive feature imaged beneath EGMB lithosphere is interpreted as the remnant of the Proterozoic collision process between the Indian land mass and East Antarctica. Thin (∼120 km) lithosphere is seen below the EGMB, which form the exterior margin of the India shield subsequent to its separation from East Antarctica through rifting and opening of the Indian Ocean in the Cretaceous. Keywords: Magnetotelluric, Lithospheric structure, Mantle plume, Mantle suture, Dharwar craton |
| first_indexed | 2024-03-12T08:18:11Z |
| format | Article |
| id | doaj.art-c704bab60a3a470394f60fe8fcf69aaa |
| institution | Directory Open Access Journal |
| issn | 1674-9871 |
| language | English |
| last_indexed | 2024-03-12T08:18:11Z |
| publishDate | 2019-09-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Geoscience Frontiers |
| spelling | doaj.art-c704bab60a3a470394f60fe8fcf69aaa2023-09-02T18:40:58ZengElsevierGeoscience Frontiers1674-98712019-09-0110519151930Magnetotelluric investigation of lithospheric electrical structure beneath the Dharwar Craton in south India: Evidence for mantle suture and plume-continental interactionD. Malleswari0K. Veeraswamy1K.K. Abdul Azeez2A.K. Gupta3Narendra Babu4Prasanta K. Patro5T. Harinarayana6MT Group, CSIR - National Geophysical Research Institute, Hyderabad, IndiaMT Group, CSIR - National Geophysical Research Institute, Hyderabad, India; Corresponding author.MT Group, CSIR - National Geophysical Research Institute, Hyderabad, IndiaMT Group, CSIR - National Geophysical Research Institute, Hyderabad, IndiaMT Group, CSIR - National Geophysical Research Institute, Hyderabad, IndiaMT Group, CSIR - National Geophysical Research Institute, Hyderabad, IndiaCrescent Institute of Science and Technology, Chennai, IndiaBroad-band and long period magnetotelluric measurements made at 63 locations along ∼500 km long Chikmagalur-Kavali profile, that cut across the Dharwar craton (DC) and Eastern Ghat Mobile Belt (EGMB) in south India, is modelled to examine the lithosphere architecture of the cratonic domain and define tectonic boundaries. The 2-D resistivity model shows moderately conductive features that intersperse a highly resistive background of crystalline rocks and spatially connect to the exposed schist belts or granitic intrusions in the DC. These features are therefore interpreted as images of fossil pathways of the volcanic emplacements associated with the greenstone belt and granite suite formation exposed in the region. A near vertical conductive feature in the upper mantle under the Chitradurga Shear Zone represents the Archean suture between the western and eastern blocks of DC. Although thick (∼200 km) cratonic (highly resistive) lithosphere is preserved, significant part of the cratonic lithosphere below the western DC is modified due to plume-continental lithosphere interactions during the Cretaceous–Tertiary period. A west-verging moderately conductive feature imaged beneath EGMB lithosphere is interpreted as the remnant of the Proterozoic collision process between the Indian land mass and East Antarctica. Thin (∼120 km) lithosphere is seen below the EGMB, which form the exterior margin of the India shield subsequent to its separation from East Antarctica through rifting and opening of the Indian Ocean in the Cretaceous. Keywords: Magnetotelluric, Lithospheric structure, Mantle plume, Mantle suture, Dharwar cratonhttp://www.sciencedirect.com/science/article/pii/S1674987118302445 |
| spellingShingle | D. Malleswari K. Veeraswamy K.K. Abdul Azeez A.K. Gupta Narendra Babu Prasanta K. Patro T. Harinarayana Magnetotelluric investigation of lithospheric electrical structure beneath the Dharwar Craton in south India: Evidence for mantle suture and plume-continental interaction Geoscience Frontiers |
| title | Magnetotelluric investigation of lithospheric electrical structure beneath the Dharwar Craton in south India: Evidence for mantle suture and plume-continental interaction |
| title_full | Magnetotelluric investigation of lithospheric electrical structure beneath the Dharwar Craton in south India: Evidence for mantle suture and plume-continental interaction |
| title_fullStr | Magnetotelluric investigation of lithospheric electrical structure beneath the Dharwar Craton in south India: Evidence for mantle suture and plume-continental interaction |
| title_full_unstemmed | Magnetotelluric investigation of lithospheric electrical structure beneath the Dharwar Craton in south India: Evidence for mantle suture and plume-continental interaction |
| title_short | Magnetotelluric investigation of lithospheric electrical structure beneath the Dharwar Craton in south India: Evidence for mantle suture and plume-continental interaction |
| title_sort | magnetotelluric investigation of lithospheric electrical structure beneath the dharwar craton in south india evidence for mantle suture and plume continental interaction |
| url | http://www.sciencedirect.com/science/article/pii/S1674987118302445 |
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