Post Middle Miocene Tectonomagmatic and Stratigraphic Evolution of the Victoria Land Basin, West Antarctica
Abstract Seismic reflection and borehole data are used to create structure maps of four regional and three local unconformities that constrain the post middle Miocene evolution of the Victoria Land Basin (VLB), which is located in the western Ross Sea within the Late Cretaceous through Quaternary We...
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ftdoajarticles:oai:doaj.org/article:82aa98cfa14c4d459257173189051910 2023-12-03T10:09:56+01:00 Post Middle Miocene Tectonomagmatic and Stratigraphic Evolution of the Victoria Land Basin, West Antarctica Christopher P. Wenman Dennis L. Harry Sumant Jha 2020-03-01T00:00:00Z https://doi.org/10.1029/2019GC008568 https://doaj.org/article/82aa98cfa14c4d459257173189051910 EN eng Wiley https://doi.org/10.1029/2019GC008568 https://doaj.org/toc/1525-2027 1525-2027 doi:10.1029/2019GC008568 https://doaj.org/article/82aa98cfa14c4d459257173189051910 Geochemistry, Geophysics, Geosystems, Vol 21, Iss 3, Pp n/a-n/a (2020) Antarctica West Antarctic Rift Victoria Land Basin Ross Sea flexure continental rift Geophysics. Cosmic physics QC801-809 Geology QE1-996.5 article 2020 ftdoajarticles https://doi.org/10.1029/2019GC008568 2023-11-05T01:35:59Z Abstract Seismic reflection and borehole data are used to create structure maps of four regional and three local unconformities that constrain the post middle Miocene evolution of the Victoria Land Basin (VLB), which is located in the western Ross Sea within the Late Cretaceous through Quaternary West Antarctic Rift System. Isochore maps of the strata between unconformities show that rifting was mostly amagmatic between 12 to 7.6 Ma, with subsidence controlled by faults bordering the northwest margin of the basin and in a tectonic zone along the southern basin axis known as the Terror Rift. Depocenters surrounding volcanic features in strata younger than 4.3 Ma indicate an increasing influence of flexure due to volcanic loading on the subsidence pattern in the southern VLB after this time. The intervening period, from 7.6 to 4.3 Ma, was a transitional period during which both extensional tectonism and magmatism exerted strong influences on basin morphology. Since 4.3 Ma, a series of flexural subbasins formed successively at different times and positions as the different volcanic centers that built Ross Island erupted. In composite, these subbasins form a flexural moat surrounding Ross Island and smaller volcanic centers immediately to the north. The widths of these basins indicate that the flexural rigidity of the lithosphere ranges from 0.20 × 1019 to 12.96 × 1019 N‐m (elastic thickness 0.6 to 2.4 km). Article in Journal/Newspaper Antarc* Antarctic Antarctica Ross Island Ross Sea Victoria Land West Antarctica Directory of Open Access Journals: DOAJ Articles Antarctic Ross Island Ross Sea Victoria Land West Antarctica Geochemistry, Geophysics, Geosystems 21 3 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Antarctica West Antarctic Rift Victoria Land Basin Ross Sea flexure continental rift Geophysics. Cosmic physics QC801-809 Geology QE1-996.5 |
spellingShingle |
Antarctica West Antarctic Rift Victoria Land Basin Ross Sea flexure continental rift Geophysics. Cosmic physics QC801-809 Geology QE1-996.5 Christopher P. Wenman Dennis L. Harry Sumant Jha Post Middle Miocene Tectonomagmatic and Stratigraphic Evolution of the Victoria Land Basin, West Antarctica |
topic_facet |
Antarctica West Antarctic Rift Victoria Land Basin Ross Sea flexure continental rift Geophysics. Cosmic physics QC801-809 Geology QE1-996.5 |
description |
Abstract Seismic reflection and borehole data are used to create structure maps of four regional and three local unconformities that constrain the post middle Miocene evolution of the Victoria Land Basin (VLB), which is located in the western Ross Sea within the Late Cretaceous through Quaternary West Antarctic Rift System. Isochore maps of the strata between unconformities show that rifting was mostly amagmatic between 12 to 7.6 Ma, with subsidence controlled by faults bordering the northwest margin of the basin and in a tectonic zone along the southern basin axis known as the Terror Rift. Depocenters surrounding volcanic features in strata younger than 4.3 Ma indicate an increasing influence of flexure due to volcanic loading on the subsidence pattern in the southern VLB after this time. The intervening period, from 7.6 to 4.3 Ma, was a transitional period during which both extensional tectonism and magmatism exerted strong influences on basin morphology. Since 4.3 Ma, a series of flexural subbasins formed successively at different times and positions as the different volcanic centers that built Ross Island erupted. In composite, these subbasins form a flexural moat surrounding Ross Island and smaller volcanic centers immediately to the north. The widths of these basins indicate that the flexural rigidity of the lithosphere ranges from 0.20 × 1019 to 12.96 × 1019 N‐m (elastic thickness 0.6 to 2.4 km). |
format |
Article in Journal/Newspaper |
author |
Christopher P. Wenman Dennis L. Harry Sumant Jha |
author_facet |
Christopher P. Wenman Dennis L. Harry Sumant Jha |
author_sort |
Christopher P. Wenman |
title |
Post Middle Miocene Tectonomagmatic and Stratigraphic Evolution of the Victoria Land Basin, West Antarctica |
title_short |
Post Middle Miocene Tectonomagmatic and Stratigraphic Evolution of the Victoria Land Basin, West Antarctica |
title_full |
Post Middle Miocene Tectonomagmatic and Stratigraphic Evolution of the Victoria Land Basin, West Antarctica |
title_fullStr |
Post Middle Miocene Tectonomagmatic and Stratigraphic Evolution of the Victoria Land Basin, West Antarctica |
title_full_unstemmed |
Post Middle Miocene Tectonomagmatic and Stratigraphic Evolution of the Victoria Land Basin, West Antarctica |
title_sort |
post middle miocene tectonomagmatic and stratigraphic evolution of the victoria land basin, west antarctica |
publisher |
Wiley |
publishDate |
2020 |
url |
https://doi.org/10.1029/2019GC008568 https://doaj.org/article/82aa98cfa14c4d459257173189051910 |
geographic |
Antarctic Ross Island Ross Sea Victoria Land West Antarctica |
geographic_facet |
Antarctic Ross Island Ross Sea Victoria Land West Antarctica |
genre |
Antarc* Antarctic Antarctica Ross Island Ross Sea Victoria Land West Antarctica |
genre_facet |
Antarc* Antarctic Antarctica Ross Island Ross Sea Victoria Land West Antarctica |
op_source |
Geochemistry, Geophysics, Geosystems, Vol 21, Iss 3, Pp n/a-n/a (2020) |
op_relation |
https://doi.org/10.1029/2019GC008568 https://doaj.org/toc/1525-2027 1525-2027 doi:10.1029/2019GC008568 https://doaj.org/article/82aa98cfa14c4d459257173189051910 |
op_doi |
https://doi.org/10.1029/2019GC008568 |
container_title |
Geochemistry, Geophysics, Geosystems |
container_volume |
21 |
container_issue |
3 |
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1784268636346646528 |