Subsurface mapping of the Ross Island flexural basin, southwest Antarctica
2016 Summer. Includes bibliographical references. Ross Island is a post-Miocene (< 4.6 Ma) volcanic island located in the Ross Sea region of southwest Antarctica. This region of Antarctica borders the western edge of the West Antarctic Rift System, along the Transantarctic Mountain front. Marine...
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ftmountainschol:oai:mountainscholar.org:10217/176639 2023-06-18T03:37:53+02:00 Subsurface mapping of the Ross Island flexural basin, southwest Antarctica Wenman, Christopher P., author Harry, Dennis, advisor Egenhoff, Sven, committee member Gooseff, Mike, committee member 2016-08-18T23:10:09Z born digital masters theses application/pdf http://hdl.handle.net/10217/176639 English eng eng Colorado State University. Libraries 2000-2019 Wenman_colostate_0053N_13670.pdf http://hdl.handle.net/10217/176639 Copyright and other restrictions may apply. User is responsible for compliance with all applicable laws. For information about copyright law, please see https://libguides.colostate.edu/copyright. Text 2016 ftmountainschol 2023-06-03T17:48:46Z 2016 Summer. Includes bibliographical references. Ross Island is a post-Miocene (< 4.6 Ma) volcanic island located in the Ross Sea region of southwest Antarctica. This region of Antarctica borders the western edge of the West Antarctic Rift System, along the Transantarctic Mountain front. Marine and over-ice multi-channel seismic reflection surveys and borehole studies targeting the Ross Sea region over the last 30+ years have been used in this study to develop a seismic stratigraphic model of the development and evolution of the Ross Island flexural basin. Four key stratigraphic horizons were identified and mapped to fully capture the basin-fill, as well as strata lying above and below the flexural basin. From oldest to youngest these horizons are named RIB-m, RIM-g, RIM-b and RIB-r. Time structure, isochron and isochore maps were created for the horizons and the stratigraphic intervals they bound. The seismic stratigraphic record shows the Ross Island flexural moat formation post-dates the main tectonic subsidence phase within the Victoria Land Basin. The maps presented here are the first to fully illustrate the evolution of the Ross Island flexural basin. The maps highlight depositional patterns of two distinct periods of flexural subsidence and basin-filling superimposed on the older N-S trending Victoria Land Basin depocenter. Two units of flexural basin fill, Unit FFI between horizons RIM-g and RIM-b (the oldest flexural basin fill), and Unit FFII between horizons RIM-b and RIB-r (the youngest flexural basin fill) are associated with the two periods of flexural subsidence. Flexural moat subsidence and subsequent filling occurred episodically during periods of active volcanism on the island. Unit FFI is estimated to range from ca. 4 to 2 Ma, corresponding with formation of the Mt. Bird volcanic edifice on Ross Island. Unit FFII ranges in age from ca. 2 to 1 Ma, and is related to Mt. Terror, Mt. Erebus, and Hut Point Peninsula volcanism. The isochore maps suggest the depocenter of the flexural basin ... Text Antarc* Antarctic Antarctica Ross Island Ross Sea Victoria Land Mountain Scholar (Digital Collections of Colorado and Wyoming) Antarctic Ross Sea Victoria Land Ross Island Hut Point ENVELOPE(166.850,166.850,-77.767,-77.767) Hut Point Peninsula ENVELOPE(166.850,166.850,-77.767,-77.767) |
institution |
Open Polar |
collection |
Mountain Scholar (Digital Collections of Colorado and Wyoming) |
op_collection_id |
ftmountainschol |
language |
English |
description |
2016 Summer. Includes bibliographical references. Ross Island is a post-Miocene (< 4.6 Ma) volcanic island located in the Ross Sea region of southwest Antarctica. This region of Antarctica borders the western edge of the West Antarctic Rift System, along the Transantarctic Mountain front. Marine and over-ice multi-channel seismic reflection surveys and borehole studies targeting the Ross Sea region over the last 30+ years have been used in this study to develop a seismic stratigraphic model of the development and evolution of the Ross Island flexural basin. Four key stratigraphic horizons were identified and mapped to fully capture the basin-fill, as well as strata lying above and below the flexural basin. From oldest to youngest these horizons are named RIB-m, RIM-g, RIM-b and RIB-r. Time structure, isochron and isochore maps were created for the horizons and the stratigraphic intervals they bound. The seismic stratigraphic record shows the Ross Island flexural moat formation post-dates the main tectonic subsidence phase within the Victoria Land Basin. The maps presented here are the first to fully illustrate the evolution of the Ross Island flexural basin. The maps highlight depositional patterns of two distinct periods of flexural subsidence and basin-filling superimposed on the older N-S trending Victoria Land Basin depocenter. Two units of flexural basin fill, Unit FFI between horizons RIM-g and RIM-b (the oldest flexural basin fill), and Unit FFII between horizons RIM-b and RIB-r (the youngest flexural basin fill) are associated with the two periods of flexural subsidence. Flexural moat subsidence and subsequent filling occurred episodically during periods of active volcanism on the island. Unit FFI is estimated to range from ca. 4 to 2 Ma, corresponding with formation of the Mt. Bird volcanic edifice on Ross Island. Unit FFII ranges in age from ca. 2 to 1 Ma, and is related to Mt. Terror, Mt. Erebus, and Hut Point Peninsula volcanism. The isochore maps suggest the depocenter of the flexural basin ... |
format |
Text |
author |
Wenman, Christopher P., author Harry, Dennis, advisor Egenhoff, Sven, committee member Gooseff, Mike, committee member |
spellingShingle |
Wenman, Christopher P., author Harry, Dennis, advisor Egenhoff, Sven, committee member Gooseff, Mike, committee member Subsurface mapping of the Ross Island flexural basin, southwest Antarctica |
author_facet |
Wenman, Christopher P., author Harry, Dennis, advisor Egenhoff, Sven, committee member Gooseff, Mike, committee member |
author_sort |
Wenman, Christopher P., author |
title |
Subsurface mapping of the Ross Island flexural basin, southwest Antarctica |
title_short |
Subsurface mapping of the Ross Island flexural basin, southwest Antarctica |
title_full |
Subsurface mapping of the Ross Island flexural basin, southwest Antarctica |
title_fullStr |
Subsurface mapping of the Ross Island flexural basin, southwest Antarctica |
title_full_unstemmed |
Subsurface mapping of the Ross Island flexural basin, southwest Antarctica |
title_sort |
subsurface mapping of the ross island flexural basin, southwest antarctica |
publisher |
Colorado State University. Libraries |
publishDate |
2016 |
url |
http://hdl.handle.net/10217/176639 |
long_lat |
ENVELOPE(166.850,166.850,-77.767,-77.767) ENVELOPE(166.850,166.850,-77.767,-77.767) |
geographic |
Antarctic Ross Sea Victoria Land Ross Island Hut Point Hut Point Peninsula |
geographic_facet |
Antarctic Ross Sea Victoria Land Ross Island Hut Point Hut Point Peninsula |
genre |
Antarc* Antarctic Antarctica Ross Island Ross Sea Victoria Land |
genre_facet |
Antarc* Antarctic Antarctica Ross Island Ross Sea Victoria Land |
op_relation |
2000-2019 Wenman_colostate_0053N_13670.pdf http://hdl.handle.net/10217/176639 |
op_rights |
Copyright and other restrictions may apply. User is responsible for compliance with all applicable laws. For information about copyright law, please see https://libguides.colostate.edu/copyright. |
_version_ |
1769010681160400896 |