Last Glacial Maximum-Holocene Glacial and Depositional History From Sediment Cores at Coulman High Beneath the Ross Ice Shelf, Antarctica
Sediment Cores collected from the shallow sub-sea floor beneath the Ross Ice Shelf at Coulman High have been analysed using sedimentological techniques to constrain the retreat history of the Last Glacial Maximum (LGM) ice sheet in the Ross Embayment, and to determine when the modern-day calving lin...
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ftvictoriauwfig:oai:figshare.com:article/17003398 2023-05-15T13:35:14+02:00 Last Glacial Maximum-Holocene Glacial and Depositional History From Sediment Cores at Coulman High Beneath the Ross Ice Shelf, Antarctica Maas, Sanne M 2012-01-01T00:00:00Z https://doi.org/10.26686/wgtn.17003398.v1 https://figshare.com/articles/thesis/Last_Glacial_Maximum-Holocene_Glacial_and_Depositional_History_From_Sediment_Cores_at_Coulman_High_Beneath_the_Ross_Ice_Shelf_Antarctica/17003398 unknown doi:10.26686/wgtn.17003398.v1 https://figshare.com/articles/thesis/Last_Glacial_Maximum-Holocene_Glacial_and_Depositional_History_From_Sediment_Cores_at_Coulman_High_Beneath_the_Ross_Ice_Shelf_Antarctica/17003398 Author Retains Copyright Earth Sciences not elsewhere classified Ross Ice Shelf Sediment Cores Antarctica School: School of Geography Environment and Earth Sciences 049999 Earth Sciences not elsewhere classified Marsden: 260104 Sedimentology Degree Discipline: Geology Degree Level: Masters Degree Name: Master of Science Text Thesis 2012 ftvictoriauwfig https://doi.org/10.26686/wgtn.17003398.v1 2021-11-18T00:07:37Z Sediment Cores collected from the shallow sub-sea floor beneath the Ross Ice Shelf at Coulman High have been analysed using sedimentological techniques to constrain the retreat history of the Last Glacial Maximum (LGM) ice sheet in the Ross Embayment, and to determine when the modern-day calving line location of the Ross Ice Shelf was established. A characteristic vertical succession of facies was identified in these cores, that can be linked to ice sheet and ice shelf extent in the Ross Embayment. The base of this succession consists of unconsolidated, clast rich muddy diamicts, and is interpreted to be deposited subglacially or in a grounding line proximal environment on account of a distinct provenance in the clast content which can only be attributed to subglacial transport from the Byrd Glacier 400 km to the south of the drill site. This is overlain by a mud with abundant clasts, similar in character to a granulated facies that has been documented previously in the Ross Sea, and is interpreted as being a characteristic grounding line lift-o facies in a sub-ice shelf setting. These glacial proximal facies pass upward into a mud, which comprises three distinctive units. i) Muds with sub-mm scale laminae resulting from traction currents occurring near the grounding line in a sub-ice shelf environment overlain by, ii) muds with sub-mm scale laminae and elevated biogenic content (diatoms and foraminifera) and sand/gravel clasts, interpreted as being deposited in open water conditions, passing up into a iii) bioturbated mud, interpreted as being deposited in sub-ice shelf environment, proximal to the calving line. The uppermost facies consists of a 20 cm thick diatom ooze with abundant clasts and pervasive bioturbation, indicative of a condensed section deposited during periodically open marine conditions. During post-LGM retreat of the ice sheet margin in western Ross Sea, and prior to the first open marine conditions at Coulman High, it is hypothesized that the grounding and calving line were in relative close ... Thesis Antarc* Antarctica Byrd Glacier Ice Sheet Ice Shelf Ross Ice Shelf Ross Sea Open Access Victoria University of Wellington / Te Herenga Waka Byrd Byrd Glacier ENVELOPE(160.333,160.333,-80.250,-80.250) Marsden ENVELOPE(66.067,66.067,-67.867,-67.867) Ross Ice Shelf Ross Sea |
institution |
Open Polar |
collection |
Open Access Victoria University of Wellington / Te Herenga Waka |
op_collection_id |
ftvictoriauwfig |
language |
unknown |
topic |
Earth Sciences not elsewhere classified Ross Ice Shelf Sediment Cores Antarctica School: School of Geography Environment and Earth Sciences 049999 Earth Sciences not elsewhere classified Marsden: 260104 Sedimentology Degree Discipline: Geology Degree Level: Masters Degree Name: Master of Science |
spellingShingle |
Earth Sciences not elsewhere classified Ross Ice Shelf Sediment Cores Antarctica School: School of Geography Environment and Earth Sciences 049999 Earth Sciences not elsewhere classified Marsden: 260104 Sedimentology Degree Discipline: Geology Degree Level: Masters Degree Name: Master of Science Maas, Sanne M Last Glacial Maximum-Holocene Glacial and Depositional History From Sediment Cores at Coulman High Beneath the Ross Ice Shelf, Antarctica |
topic_facet |
Earth Sciences not elsewhere classified Ross Ice Shelf Sediment Cores Antarctica School: School of Geography Environment and Earth Sciences 049999 Earth Sciences not elsewhere classified Marsden: 260104 Sedimentology Degree Discipline: Geology Degree Level: Masters Degree Name: Master of Science |
description |
Sediment Cores collected from the shallow sub-sea floor beneath the Ross Ice Shelf at Coulman High have been analysed using sedimentological techniques to constrain the retreat history of the Last Glacial Maximum (LGM) ice sheet in the Ross Embayment, and to determine when the modern-day calving line location of the Ross Ice Shelf was established. A characteristic vertical succession of facies was identified in these cores, that can be linked to ice sheet and ice shelf extent in the Ross Embayment. The base of this succession consists of unconsolidated, clast rich muddy diamicts, and is interpreted to be deposited subglacially or in a grounding line proximal environment on account of a distinct provenance in the clast content which can only be attributed to subglacial transport from the Byrd Glacier 400 km to the south of the drill site. This is overlain by a mud with abundant clasts, similar in character to a granulated facies that has been documented previously in the Ross Sea, and is interpreted as being a characteristic grounding line lift-o facies in a sub-ice shelf setting. These glacial proximal facies pass upward into a mud, which comprises three distinctive units. i) Muds with sub-mm scale laminae resulting from traction currents occurring near the grounding line in a sub-ice shelf environment overlain by, ii) muds with sub-mm scale laminae and elevated biogenic content (diatoms and foraminifera) and sand/gravel clasts, interpreted as being deposited in open water conditions, passing up into a iii) bioturbated mud, interpreted as being deposited in sub-ice shelf environment, proximal to the calving line. The uppermost facies consists of a 20 cm thick diatom ooze with abundant clasts and pervasive bioturbation, indicative of a condensed section deposited during periodically open marine conditions. During post-LGM retreat of the ice sheet margin in western Ross Sea, and prior to the first open marine conditions at Coulman High, it is hypothesized that the grounding and calving line were in relative close ... |
format |
Thesis |
author |
Maas, Sanne M |
author_facet |
Maas, Sanne M |
author_sort |
Maas, Sanne M |
title |
Last Glacial Maximum-Holocene Glacial and Depositional History From Sediment Cores at Coulman High Beneath the Ross Ice Shelf, Antarctica |
title_short |
Last Glacial Maximum-Holocene Glacial and Depositional History From Sediment Cores at Coulman High Beneath the Ross Ice Shelf, Antarctica |
title_full |
Last Glacial Maximum-Holocene Glacial and Depositional History From Sediment Cores at Coulman High Beneath the Ross Ice Shelf, Antarctica |
title_fullStr |
Last Glacial Maximum-Holocene Glacial and Depositional History From Sediment Cores at Coulman High Beneath the Ross Ice Shelf, Antarctica |
title_full_unstemmed |
Last Glacial Maximum-Holocene Glacial and Depositional History From Sediment Cores at Coulman High Beneath the Ross Ice Shelf, Antarctica |
title_sort |
last glacial maximum-holocene glacial and depositional history from sediment cores at coulman high beneath the ross ice shelf, antarctica |
publishDate |
2012 |
url |
https://doi.org/10.26686/wgtn.17003398.v1 https://figshare.com/articles/thesis/Last_Glacial_Maximum-Holocene_Glacial_and_Depositional_History_From_Sediment_Cores_at_Coulman_High_Beneath_the_Ross_Ice_Shelf_Antarctica/17003398 |
long_lat |
ENVELOPE(160.333,160.333,-80.250,-80.250) ENVELOPE(66.067,66.067,-67.867,-67.867) |
geographic |
Byrd Byrd Glacier Marsden Ross Ice Shelf Ross Sea |
geographic_facet |
Byrd Byrd Glacier Marsden Ross Ice Shelf Ross Sea |
genre |
Antarc* Antarctica Byrd Glacier Ice Sheet Ice Shelf Ross Ice Shelf Ross Sea |
genre_facet |
Antarc* Antarctica Byrd Glacier Ice Sheet Ice Shelf Ross Ice Shelf Ross Sea |
op_relation |
doi:10.26686/wgtn.17003398.v1 https://figshare.com/articles/thesis/Last_Glacial_Maximum-Holocene_Glacial_and_Depositional_History_From_Sediment_Cores_at_Coulman_High_Beneath_the_Ross_Ice_Shelf_Antarctica/17003398 |
op_rights |
Author Retains Copyright |
op_doi |
https://doi.org/10.26686/wgtn.17003398.v1 |
_version_ |
1766063253822111744 |