Middle Miocene grounding events on the Ross Sea outer continental shelf, Antarctica
The middle Miocene δ18O enrichments from deep-sea data and eustatic sea level falls are traditionally attributed to expansion of the East Antarctic Ice Sheet. Interpretations of such data have led many to conclude that the West Antarctic Ice Sheet (WAIS) was not well-developed until the late Miocene...
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ftlouisianastuir:oai:digitalcommons.lsu.edu:gradschool_theses-3522 2023-06-11T04:07:14+02:00 Middle Miocene grounding events on the Ross Sea outer continental shelf, Antarctica Chow, Juan Manuel 2003-01-01T08:00:00Z application/pdf https://digitalcommons.lsu.edu/gradschool_theses/2523 https://doi.org/10.31390/gradschool_theses.2523 https://digitalcommons.lsu.edu/context/gradschool_theses/article/3522/viewcontent/uc.pdf unknown LSU Digital Commons https://digitalcommons.lsu.edu/gradschool_theses/2523 doi:10.31390/gradschool_theses.2523 https://digitalcommons.lsu.edu/context/gradschool_theses/article/3522/viewcontent/uc.pdf LSU Master's Theses glaciation middle miocene antarctica Earth Sciences text 2003 ftlouisianastuir https://doi.org/10.31390/gradschool_theses.2523 2023-05-28T19:02:53Z The middle Miocene δ18O enrichments from deep-sea data and eustatic sea level falls are traditionally attributed to expansion of the East Antarctic Ice Sheet. Interpretations of such data have led many to conclude that the West Antarctic Ice Sheet (WAIS) was not well-developed until the late Miocene. In such a scenario, middle Miocene glaciation on the Ross Sea shelf would have had to be minimal, perhaps in the form of ice caps, to be consistent with proxy data. New seismic-stratigraphic analysis of the Ross Sea outer continental shelf suggests that at least five grounding events (ice sheet advances into the marine environment, in contact with the sea floor) occurred in the middle Miocene. Because West Antarctica constitutes a major part of the drainage basin for the Ross Sea, these results do not support the long-standing assumption that West Antarctica was substantially ice-free, although the number of WAIS grounding events generally matches the number of extreme δ18O enrichments and eustatic lowstands. Rather, the seismic-stratigraphic evidence from the Ross Sea shelf documents waxing and waning of a well-developed WAIS in the marine environment at least on the Pacific sector of the West Antarctic continental shelf, and suggests a WAIS that was more robust in the middle Miocene than has previously been deduced from proxy data. Text Antarc* Antarctic Antarctica Ice Sheet Ross Sea West Antarctica LSU Digital Commons (Louisiana State University) Antarctic East Antarctic Ice Sheet Pacific Ross Sea West Antarctic Ice Sheet West Antarctica |
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glaciation middle miocene antarctica Earth Sciences |
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glaciation middle miocene antarctica Earth Sciences Chow, Juan Manuel Middle Miocene grounding events on the Ross Sea outer continental shelf, Antarctica |
topic_facet |
glaciation middle miocene antarctica Earth Sciences |
description |
The middle Miocene δ18O enrichments from deep-sea data and eustatic sea level falls are traditionally attributed to expansion of the East Antarctic Ice Sheet. Interpretations of such data have led many to conclude that the West Antarctic Ice Sheet (WAIS) was not well-developed until the late Miocene. In such a scenario, middle Miocene glaciation on the Ross Sea shelf would have had to be minimal, perhaps in the form of ice caps, to be consistent with proxy data. New seismic-stratigraphic analysis of the Ross Sea outer continental shelf suggests that at least five grounding events (ice sheet advances into the marine environment, in contact with the sea floor) occurred in the middle Miocene. Because West Antarctica constitutes a major part of the drainage basin for the Ross Sea, these results do not support the long-standing assumption that West Antarctica was substantially ice-free, although the number of WAIS grounding events generally matches the number of extreme δ18O enrichments and eustatic lowstands. Rather, the seismic-stratigraphic evidence from the Ross Sea shelf documents waxing and waning of a well-developed WAIS in the marine environment at least on the Pacific sector of the West Antarctic continental shelf, and suggests a WAIS that was more robust in the middle Miocene than has previously been deduced from proxy data. |
format |
Text |
author |
Chow, Juan Manuel |
author_facet |
Chow, Juan Manuel |
author_sort |
Chow, Juan Manuel |
title |
Middle Miocene grounding events on the Ross Sea outer continental shelf, Antarctica |
title_short |
Middle Miocene grounding events on the Ross Sea outer continental shelf, Antarctica |
title_full |
Middle Miocene grounding events on the Ross Sea outer continental shelf, Antarctica |
title_fullStr |
Middle Miocene grounding events on the Ross Sea outer continental shelf, Antarctica |
title_full_unstemmed |
Middle Miocene grounding events on the Ross Sea outer continental shelf, Antarctica |
title_sort |
middle miocene grounding events on the ross sea outer continental shelf, antarctica |
publisher |
LSU Digital Commons |
publishDate |
2003 |
url |
https://digitalcommons.lsu.edu/gradschool_theses/2523 https://doi.org/10.31390/gradschool_theses.2523 https://digitalcommons.lsu.edu/context/gradschool_theses/article/3522/viewcontent/uc.pdf |
geographic |
Antarctic East Antarctic Ice Sheet Pacific Ross Sea West Antarctic Ice Sheet West Antarctica |
geographic_facet |
Antarctic East Antarctic Ice Sheet Pacific Ross Sea West Antarctic Ice Sheet West Antarctica |
genre |
Antarc* Antarctic Antarctica Ice Sheet Ross Sea West Antarctica |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet Ross Sea West Antarctica |
op_source |
LSU Master's Theses |
op_relation |
https://digitalcommons.lsu.edu/gradschool_theses/2523 doi:10.31390/gradschool_theses.2523 https://digitalcommons.lsu.edu/context/gradschool_theses/article/3522/viewcontent/uc.pdf |
op_doi |
https://doi.org/10.31390/gradschool_theses.2523 |
_version_ |
1768380215590912000 |