Crustal Structure beneath the Precambrian Cratons of Gondwanaland and Its Evolution Using Teleseismic Receiver Function
AbstractThe Gondwana supercontinent was an accretion of several cratons from different landmasses, namely South America, Antarctica, Africa, Madagascar, Australia, and the Indian subcontinent. The splitting of Gondwanaland during the Mesozoic led to the gradual rifting of these different cratons ove...
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ftdoajarticles:oai:doaj.org/article:21bb45296969475fa6e83c8e92026ad4 2023-05-15T14:00:19+02:00 Crustal Structure beneath the Precambrian Cratons of Gondwanaland and Its Evolution Using Teleseismic Receiver Function Pousali Mukherjee Kajaljyoti Borah Alok Yadav 2022-02-01T00:00:00Z https://doi.org/10.2113/2022/2558277 https://doaj.org/article/21bb45296969475fa6e83c8e92026ad4 EN eng GeoScienceWorld https://pubs.geoscienceworld.org/lithosphere/article/2021/Special%206/2558277/611661/Crustal-Structure-beneath-the-Precambrian-Cratons https://doaj.org/toc/1941-8264 https://doaj.org/toc/1947-4253 1947-4253 1941-8264 doi:10.2113/2022/2558277 https://doaj.org/article/21bb45296969475fa6e83c8e92026ad4 Lithosphere, Vol 2021, Iss Special 6 (2022) Geology QE1-996.5 article 2022 ftdoajarticles https://doi.org/10.2113/2022/2558277 2022-12-30T21:30:32Z AbstractThe Gondwana supercontinent was an accretion of several cratons from different landmasses, namely South America, Antarctica, Africa, Madagascar, Australia, and the Indian subcontinent. The splitting of Gondwanaland during the Mesozoic led to the gradual rifting of these different cratons over geologic time. In this study, crustal structures are imaged by modeling receiver functions to understand the differences in the nature of the crust that was once part of Precambrian Gondwanaland. On comparing the overall crustal thickness with the age of the cratons, it was found that average bounds of crustal thickness varied from ~33 to 45 km in the Precambrian cratons of different ages, and composition varied from felsic to intermediate (Vp/Vs≈1.65−1.78). Observations of gradational Moho beneath few stations could indicate the possibility of mafic underplating at some point in their history of formation, growth, or evolution. Even if plate tectonics were dominant in the middle to late Archean, difference in spreading, drifting velocity, and distance travelled by the continents after Gondwana separation possibly led to crustal delamination, and destruction of thick crustal roots of cratons. Other than delamination, the role of episodic cycles of crustal growth is also observed in the pattern of crustal thickness across each division of the Precambrian. This could be due to alternative high and low crustal regeneration process, repeated episodic recycling, and reworking of early crust, supported by previous geodynamical models. Article in Journal/Newspaper Antarc* Antarctica Directory of Open Access Journals: DOAJ Articles Indian Lithosphere 2021 Special 6 |
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Directory of Open Access Journals: DOAJ Articles |
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English |
topic |
Geology QE1-996.5 |
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Geology QE1-996.5 Pousali Mukherjee Kajaljyoti Borah Alok Yadav Crustal Structure beneath the Precambrian Cratons of Gondwanaland and Its Evolution Using Teleseismic Receiver Function |
topic_facet |
Geology QE1-996.5 |
description |
AbstractThe Gondwana supercontinent was an accretion of several cratons from different landmasses, namely South America, Antarctica, Africa, Madagascar, Australia, and the Indian subcontinent. The splitting of Gondwanaland during the Mesozoic led to the gradual rifting of these different cratons over geologic time. In this study, crustal structures are imaged by modeling receiver functions to understand the differences in the nature of the crust that was once part of Precambrian Gondwanaland. On comparing the overall crustal thickness with the age of the cratons, it was found that average bounds of crustal thickness varied from ~33 to 45 km in the Precambrian cratons of different ages, and composition varied from felsic to intermediate (Vp/Vs≈1.65−1.78). Observations of gradational Moho beneath few stations could indicate the possibility of mafic underplating at some point in their history of formation, growth, or evolution. Even if plate tectonics were dominant in the middle to late Archean, difference in spreading, drifting velocity, and distance travelled by the continents after Gondwana separation possibly led to crustal delamination, and destruction of thick crustal roots of cratons. Other than delamination, the role of episodic cycles of crustal growth is also observed in the pattern of crustal thickness across each division of the Precambrian. This could be due to alternative high and low crustal regeneration process, repeated episodic recycling, and reworking of early crust, supported by previous geodynamical models. |
format |
Article in Journal/Newspaper |
author |
Pousali Mukherjee Kajaljyoti Borah Alok Yadav |
author_facet |
Pousali Mukherjee Kajaljyoti Borah Alok Yadav |
author_sort |
Pousali Mukherjee |
title |
Crustal Structure beneath the Precambrian Cratons of Gondwanaland and Its Evolution Using Teleseismic Receiver Function |
title_short |
Crustal Structure beneath the Precambrian Cratons of Gondwanaland and Its Evolution Using Teleseismic Receiver Function |
title_full |
Crustal Structure beneath the Precambrian Cratons of Gondwanaland and Its Evolution Using Teleseismic Receiver Function |
title_fullStr |
Crustal Structure beneath the Precambrian Cratons of Gondwanaland and Its Evolution Using Teleseismic Receiver Function |
title_full_unstemmed |
Crustal Structure beneath the Precambrian Cratons of Gondwanaland and Its Evolution Using Teleseismic Receiver Function |
title_sort |
crustal structure beneath the precambrian cratons of gondwanaland and its evolution using teleseismic receiver function |
publisher |
GeoScienceWorld |
publishDate |
2022 |
url |
https://doi.org/10.2113/2022/2558277 https://doaj.org/article/21bb45296969475fa6e83c8e92026ad4 |
geographic |
Indian |
geographic_facet |
Indian |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
Lithosphere, Vol 2021, Iss Special 6 (2022) |
op_relation |
https://pubs.geoscienceworld.org/lithosphere/article/2021/Special%206/2558277/611661/Crustal-Structure-beneath-the-Precambrian-Cratons https://doaj.org/toc/1941-8264 https://doaj.org/toc/1947-4253 1947-4253 1941-8264 doi:10.2113/2022/2558277 https://doaj.org/article/21bb45296969475fa6e83c8e92026ad4 |
op_doi |
https://doi.org/10.2113/2022/2558277 |
container_title |
Lithosphere |
container_volume |
2021 |
container_issue |
Special 6 |
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1766269373808377856 |