Marie Byrd Land and Ellsworth Land: volcanology
Nineteen large (2348–4285 masl) central polygenetic alkaline shield-like composite volcanoes and numerous smaller volcanoes in Marie Byrd Land (MBL) and western Ellsworth Land rise above the West Antarctic Ice Sheet (WAIS) and comprise the MBL Volcanic Group (MBLVG). Earliest MBLVG volcanism dates t...
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ftdatacite:10.6084/m9.figshare.c.5205362 2023-05-15T13:44:20+02:00 Marie Byrd Land and Ellsworth Land: volcanology T.I. Wilch W.C. McIntosh K.S. Panter 2020 https://dx.doi.org/10.6084/m9.figshare.c.5205362 https://geolsoc.figshare.com/collections/Marie_Byrd_Land_and_Ellsworth_Land_I_Volcanology/5205362 unknown Geological Society of London https://dx.doi.org/10.1144/m55-2019-39 Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 CC-BY Geology FOS Earth and related environmental sciences Collection article 2020 ftdatacite https://doi.org/10.6084/m9.figshare.c.5205362 https://doi.org/10.1144/m55-2019-39 2021-11-05T12:55:41Z Nineteen large (2348–4285 masl) central polygenetic alkaline shield-like composite volcanoes and numerous smaller volcanoes in Marie Byrd Land (MBL) and western Ellsworth Land rise above the West Antarctic Ice Sheet (WAIS) and comprise the MBL Volcanic Group (MBLVG). Earliest MBLVG volcanism dates to the latest Eocene (36.6 Ma). Polygenetic volcanism began by the middle Miocene (13.4 Ma) and has continued into the Holocene without major interruptions, producing the central volcanoes with 24 large (2–10 km diameter) summit calderas and abundant evidence for explosive eruptions in caldera rim deposits. Rock lithofacies are dominated by basanite and trachyte/phonolite lava and breccia, deposited in both subaerial and ice-contact environments. The chronology of MBLVG volcanism is well constrained by 330 age analyses, including 52 new 40 Ar/ 39 Ar ages. A volcanic lithofacies record of glaciation provides evidence of local ice cap glaciation at 29–27 Ma and of widespread WAIS glaciation by 9 Ma. Late Quaternary glaciovolcanic records document WAIS expansions that correlate to eustatic sea-level lowstands (MIS 16, 4 and 2): the WAIS was +500 m at 609 ka at coastal Mt Murphy, and +400 m at 64.7 ka, +400 m at 21.2 ka and +575 m at 17.5 ka at inland Mt Takahe. Article in Journal/Newspaper Antarc* Antarctic Ice cap Ice Sheet Marie Byrd Land DataCite Metadata Store (German National Library of Science and Technology) Antarctic West Antarctic Ice Sheet Byrd Marie Byrd Land ENVELOPE(-130.000,-130.000,-78.000,-78.000) Ellsworth Land ENVELOPE(-85.000,-85.000,-75.000,-75.000) Takahe ENVELOPE(-112.233,-112.233,-76.267,-76.267) |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
unknown |
topic |
Geology FOS Earth and related environmental sciences |
spellingShingle |
Geology FOS Earth and related environmental sciences T.I. Wilch W.C. McIntosh K.S. Panter Marie Byrd Land and Ellsworth Land: volcanology |
topic_facet |
Geology FOS Earth and related environmental sciences |
description |
Nineteen large (2348–4285 masl) central polygenetic alkaline shield-like composite volcanoes and numerous smaller volcanoes in Marie Byrd Land (MBL) and western Ellsworth Land rise above the West Antarctic Ice Sheet (WAIS) and comprise the MBL Volcanic Group (MBLVG). Earliest MBLVG volcanism dates to the latest Eocene (36.6 Ma). Polygenetic volcanism began by the middle Miocene (13.4 Ma) and has continued into the Holocene without major interruptions, producing the central volcanoes with 24 large (2–10 km diameter) summit calderas and abundant evidence for explosive eruptions in caldera rim deposits. Rock lithofacies are dominated by basanite and trachyte/phonolite lava and breccia, deposited in both subaerial and ice-contact environments. The chronology of MBLVG volcanism is well constrained by 330 age analyses, including 52 new 40 Ar/ 39 Ar ages. A volcanic lithofacies record of glaciation provides evidence of local ice cap glaciation at 29–27 Ma and of widespread WAIS glaciation by 9 Ma. Late Quaternary glaciovolcanic records document WAIS expansions that correlate to eustatic sea-level lowstands (MIS 16, 4 and 2): the WAIS was +500 m at 609 ka at coastal Mt Murphy, and +400 m at 64.7 ka, +400 m at 21.2 ka and +575 m at 17.5 ka at inland Mt Takahe. |
format |
Article in Journal/Newspaper |
author |
T.I. Wilch W.C. McIntosh K.S. Panter |
author_facet |
T.I. Wilch W.C. McIntosh K.S. Panter |
author_sort |
T.I. Wilch |
title |
Marie Byrd Land and Ellsworth Land: volcanology |
title_short |
Marie Byrd Land and Ellsworth Land: volcanology |
title_full |
Marie Byrd Land and Ellsworth Land: volcanology |
title_fullStr |
Marie Byrd Land and Ellsworth Land: volcanology |
title_full_unstemmed |
Marie Byrd Land and Ellsworth Land: volcanology |
title_sort |
marie byrd land and ellsworth land: volcanology |
publisher |
Geological Society of London |
publishDate |
2020 |
url |
https://dx.doi.org/10.6084/m9.figshare.c.5205362 https://geolsoc.figshare.com/collections/Marie_Byrd_Land_and_Ellsworth_Land_I_Volcanology/5205362 |
long_lat |
ENVELOPE(-130.000,-130.000,-78.000,-78.000) ENVELOPE(-85.000,-85.000,-75.000,-75.000) ENVELOPE(-112.233,-112.233,-76.267,-76.267) |
geographic |
Antarctic West Antarctic Ice Sheet Byrd Marie Byrd Land Ellsworth Land Takahe |
geographic_facet |
Antarctic West Antarctic Ice Sheet Byrd Marie Byrd Land Ellsworth Land Takahe |
genre |
Antarc* Antarctic Ice cap Ice Sheet Marie Byrd Land |
genre_facet |
Antarc* Antarctic Ice cap Ice Sheet Marie Byrd Land |
op_relation |
https://dx.doi.org/10.1144/m55-2019-39 |
op_rights |
Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.6084/m9.figshare.c.5205362 https://doi.org/10.1144/m55-2019-39 |
_version_ |
1766200341238382592 |