A Morphologic and Alignment Analysis of Volcanic Ridge and Cones to Determine Stress Directions, Adare Basin, Antarctica.
This study examines the tectonic forces at work in a region of Antarctica in the northwest Ross Sea, along the western boundary of the West Antarctic Rift System. The focus is on analysis of a submarine volcanic ridge and associated cones found in the Adare Basin. Multibeam sonar data were examined...
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The Ohio State University
2014
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ftohiostateu:oai:kb.osu.edu:1811/62549 2023-05-15T13:54:37+02:00 A Morphologic and Alignment Analysis of Volcanic Ridge and Cones to Determine Stress Directions, Adare Basin, Antarctica. Vargo, Brian Wison, Terry 2014-12 application/pdf http://hdl.handle.net/1811/62549 en_US eng The Ohio State University The Ohio State University. School of Earth Sciences Senior Theses; 2014 http://hdl.handle.net/1811/62549 Adare Basin Vent Alignment Bathymetric Analysis Volcanic Ridge Antarctica Thesis 2014 ftohiostateu 2020-08-22T19:32:18Z This study examines the tectonic forces at work in a region of Antarctica in the northwest Ross Sea, along the western boundary of the West Antarctic Rift System. The focus is on analysis of a submarine volcanic ridge and associated cones found in the Adare Basin. Multibeam sonar data were examined using spatial analysis tools to map the morphology of the seafloor, specifically to map volcanic cones and their alignments to constrain crustal stresses. The analysis revealed that the NE-SW volcanic ridge is composed of four segments of varying trend. Cone alignments and the long axes of elongate volcanic cones have trends generally parallel to the ridge segments. These results suggest that the crustal stresses at the time of magmatism consisted of NE-SW maximum and NW-SE minimum horizontal stresses. The volcanic ridge, cones and cone alignments are parallel to and spatially linked with mapped normal faults in the area. The presence of en echelon cone alignments in a zone that runs parallel to the volcanic ridge and fault trends suggests that right-lateral shear occurred along pre-existing faults at the time of emplacement. An overall rhombic shape of the ridge and a wider central ridge area are consistent with shear along curved, pre-existing faults. Pre-existing rift faults apparently acted as conduits for magmatism to reach the surface. The Shell Exploration and Production Company No embargo Thesis Antarc* Antarctic Antarctica Ross Sea Ohio State University (OSU): Knowledge Bank Antarctic Ross Sea Adare ENVELOPE(170.233,170.233,-71.283,-71.283) Adare Basin ENVELOPE(175.000,175.000,-71.000,-71.000) |
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Open Polar |
collection |
Ohio State University (OSU): Knowledge Bank |
op_collection_id |
ftohiostateu |
language |
English |
topic |
Adare Basin Vent Alignment Bathymetric Analysis Volcanic Ridge Antarctica |
spellingShingle |
Adare Basin Vent Alignment Bathymetric Analysis Volcanic Ridge Antarctica Vargo, Brian A Morphologic and Alignment Analysis of Volcanic Ridge and Cones to Determine Stress Directions, Adare Basin, Antarctica. |
topic_facet |
Adare Basin Vent Alignment Bathymetric Analysis Volcanic Ridge Antarctica |
description |
This study examines the tectonic forces at work in a region of Antarctica in the northwest Ross Sea, along the western boundary of the West Antarctic Rift System. The focus is on analysis of a submarine volcanic ridge and associated cones found in the Adare Basin. Multibeam sonar data were examined using spatial analysis tools to map the morphology of the seafloor, specifically to map volcanic cones and their alignments to constrain crustal stresses. The analysis revealed that the NE-SW volcanic ridge is composed of four segments of varying trend. Cone alignments and the long axes of elongate volcanic cones have trends generally parallel to the ridge segments. These results suggest that the crustal stresses at the time of magmatism consisted of NE-SW maximum and NW-SE minimum horizontal stresses. The volcanic ridge, cones and cone alignments are parallel to and spatially linked with mapped normal faults in the area. The presence of en echelon cone alignments in a zone that runs parallel to the volcanic ridge and fault trends suggests that right-lateral shear occurred along pre-existing faults at the time of emplacement. An overall rhombic shape of the ridge and a wider central ridge area are consistent with shear along curved, pre-existing faults. Pre-existing rift faults apparently acted as conduits for magmatism to reach the surface. The Shell Exploration and Production Company No embargo |
author2 |
Wison, Terry |
format |
Thesis |
author |
Vargo, Brian |
author_facet |
Vargo, Brian |
author_sort |
Vargo, Brian |
title |
A Morphologic and Alignment Analysis of Volcanic Ridge and Cones to Determine Stress Directions, Adare Basin, Antarctica. |
title_short |
A Morphologic and Alignment Analysis of Volcanic Ridge and Cones to Determine Stress Directions, Adare Basin, Antarctica. |
title_full |
A Morphologic and Alignment Analysis of Volcanic Ridge and Cones to Determine Stress Directions, Adare Basin, Antarctica. |
title_fullStr |
A Morphologic and Alignment Analysis of Volcanic Ridge and Cones to Determine Stress Directions, Adare Basin, Antarctica. |
title_full_unstemmed |
A Morphologic and Alignment Analysis of Volcanic Ridge and Cones to Determine Stress Directions, Adare Basin, Antarctica. |
title_sort |
morphologic and alignment analysis of volcanic ridge and cones to determine stress directions, adare basin, antarctica. |
publisher |
The Ohio State University |
publishDate |
2014 |
url |
http://hdl.handle.net/1811/62549 |
long_lat |
ENVELOPE(170.233,170.233,-71.283,-71.283) ENVELOPE(175.000,175.000,-71.000,-71.000) |
geographic |
Antarctic Ross Sea Adare Adare Basin |
geographic_facet |
Antarctic Ross Sea Adare Adare Basin |
genre |
Antarc* Antarctic Antarctica Ross Sea |
genre_facet |
Antarc* Antarctic Antarctica Ross Sea |
op_relation |
The Ohio State University. School of Earth Sciences Senior Theses; 2014 http://hdl.handle.net/1811/62549 |
_version_ |
1766260633474433024 |