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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ftdoajarticles:oai:doaj.org/article:c704bab60a3a470394f60fe8fcf69aaa 2023-10-01T03:51:24+02:00 Magnetotelluric investigation of lithospheric electrical structure beneath the Dharwar Craton in south India: Evidence for mantle suture and plume-continental interaction D. Malleswari K. Veeraswamy K.K. Abdul Azeez A.K. Gupta Narendra Babu Prasanta K. Patro T. Harinarayana 2019-09-01T00:00:00Z https://doi.org/10.1016/j.gsf.2018.10.011 https://doaj.org/article/c704bab60a3a470394f60fe8fcf69aaa EN eng Elsevier http://www.sciencedirect.com/science/article/pii/S1674987118302445 https://doaj.org/toc/1674-9871 1674-9871 doi:10.1016/j.gsf.2018.10.011 https://doaj.org/article/c704bab60a3a470394f60fe8fcf69aaa Geoscience Frontiers, Vol 10, Iss 5, Pp 1915-1930 (2019) Geology QE1-996.5 article 2019 ftdoajarticles https://doi.org/10.1016/j.gsf.2018.10.011 2023-09-03T00:38:33Z 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 Article in Journal/Newspaper Antarc* Antarctica East Antarctica Directory of Open Access Journals: DOAJ Articles East Antarctica Indian Geoscience Frontiers 10 5 1915 1930 |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
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ftdoajarticles |
language |
English |
topic |
Geology QE1-996.5 |
spellingShingle |
Geology QE1-996.5 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 |
topic_facet |
Geology QE1-996.5 |
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 |
format |
Article in Journal/Newspaper |
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 |
title |
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_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_sort |
magnetotelluric investigation of lithospheric electrical structure beneath the dharwar craton in south india: evidence for mantle suture and plume-continental interaction |
publisher |
Elsevier |
publishDate |
2019 |
url |
https://doi.org/10.1016/j.gsf.2018.10.011 https://doaj.org/article/c704bab60a3a470394f60fe8fcf69aaa |
geographic |
East Antarctica Indian |
geographic_facet |
East Antarctica Indian |
genre |
Antarc* Antarctica East Antarctica |
genre_facet |
Antarc* Antarctica East Antarctica |
op_source |
Geoscience Frontiers, Vol 10, Iss 5, Pp 1915-1930 (2019) |
op_relation |
http://www.sciencedirect.com/science/article/pii/S1674987118302445 https://doaj.org/toc/1674-9871 1674-9871 doi:10.1016/j.gsf.2018.10.011 https://doaj.org/article/c704bab60a3a470394f60fe8fcf69aaa |
op_doi |
https://doi.org/10.1016/j.gsf.2018.10.011 |
container_title |
Geoscience Frontiers |
container_volume |
10 |
container_issue |
5 |
container_start_page |
1915 |
op_container_end_page |
1930 |
_version_ |
1778535117176700928 |