Magnetic anomaly patterns over crustal blocks of the King Edward VII Peninsula, Marie Byrd Land, West Antarctica
Within the framework of the GITARA II project an aeromagnetic survey was performed during the GANOVEXVII expedition (1992/1993) over the King Edward VII Peninsula in northwestern Marie Byrd Land (West Antarctica). This region which may represent the eastern flank of the Ross Sea rift system had prev...
Published in: | Annals of Geophysics |
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Istituto Nazionale di Geofisica e Vulcanologia, INGV
2000
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Online Access: | https://www.annalsofgeophysics.eu/index.php/annals/article/view/3634 https://doi.org/10.4401/ag-3634 |
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ftjaog:oai:ojs.annalsofgeophysics.eu:article/3634 2023-05-15T13:54:52+02:00 Magnetic anomaly patterns over crustal blocks of the King Edward VII Peninsula, Marie Byrd Land, West Antarctica Ferraccioli, F. Damaske, D. Bozzo, E. Spano, M. Chiappini, M. 2000-12-25 application/pdf https://www.annalsofgeophysics.eu/index.php/annals/article/view/3634 https://doi.org/10.4401/ag-3634 eng eng Istituto Nazionale di Geofisica e Vulcanologia, INGV https://www.annalsofgeophysics.eu/index.php/annals/article/view/3634/3689 https://www.annalsofgeophysics.eu/index.php/annals/article/view/3634 doi:10.4401/ag-3634 Annals of Geophysics; V. 43 N. 2 (2000) Annals of Geophysics; Vol. 43 No. 2 (2000) 2037-416X 1593-5213 Edward VII Peninsula Aeromagnetic anomalies tectonic block west antarctic rift system Marie Byrd Land antartica 04.05.04. Magnetic anomalies info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2000 ftjaog https://doi.org/10.4401/ag-3634 2022-03-27T06:36:31Z Within the framework of the GITARA II project an aeromagnetic survey was performed during the GANOVEXVII expedition (1992/1993) over the King Edward VII Peninsula in northwestern Marie Byrd Land (West Antarctica). This region which may represent the eastern flank of the Ross Sea rift system had previously been explored only at reconnaissance level. New total field and upward continued (10 km) magnetic anomaly maps are produced and interpreted here to map and discuss the crustal structure of the Edward VII Peninsula. Tworound-shaped, high-amplitude magnetic anomalies are recognised over the Alexandra Mountains block. The anomalies are difficult to interpret since susceptibility data indicate the prevalence of non-magnetic rocks at the surface. A possible interpretation is that the anomalies are due to Cretaceous mafic intrusives distinct from weakly magnetic Byrd Coast Granite of the adjacent Rockefeller Mountains block. Alternatively the anomalies could be related to buried pluton-sized Devonian Ford Granodiorite intruded by dikes. If Cretaceous in age, the former intrusives revealed from the magnetics could also be responsible for contact metamorphism of the adjacent Alexandra Mountains migmatites. Lower amplitude circular anomalies over the Central Plateau and Prestrud Inlet are likely to be caused by unexposed Devonian Ford Granodiorite which crops out in the Ford Ranges. Elongated high-frequency anomalies of the Sulzberger Bay are similar to those recognised over seismically constrained Cenozoic rift-related volcanics of the Ross Sea. A broad magnetic low over the Sulzberger Ice Shelf may be indicative of a fault bounded graben-like basin with sedimentary infill. Overall recognition of magnetic anomaly patterns and trends reveals segmentation of the Edward VII Peninsula and of the adjacent marine areas in distinct crustal blocks. Faults may separate these blocks and they are interpreted to reflect multiple Cretaceous and maybe Cenozoic crustal extension\uplift phases within this part of the West Antarctic rift system. Article in Journal/Newspaper Antarc* Antarctic Antarctica antartic* Ice Shelf Marie Byrd Land Ross Sea Sulzberger Bay Sulzberger Ice Shelf West Antarctica Annals of Geophysics (INGV, Istituto Nazionale di Geofisica e Vulcanologia) Antarctic Ross Sea West Antarctica Byrd Marie Byrd Land ENVELOPE(-130.000,-130.000,-78.000,-78.000) Sulzberger Bay ENVELOPE(-152.000,-152.000,-77.000,-77.000) Ford Ranges ENVELOPE(-145.000,-145.000,-77.000,-77.000) Prestrud ENVELOPE(-165.117,-165.117,-86.567,-86.567) Edward VII Peninsula ENVELOPE(-155.000,-155.000,-77.667,-77.667) Sulzberger Ice Shelf ENVELOPE(-148.000,-148.000,-77.000,-77.000) Alexandra Mountains ENVELOPE(-153.500,-153.500,-77.417,-77.417) Rockefeller Mountains ENVELOPE(-155.000,-155.000,-78.000,-78.000) Prestrud Inlet ENVELOPE(-156.000,-156.000,-78.300,-78.300) Annals of Geophysics 43 2 |
institution |
Open Polar |
collection |
Annals of Geophysics (INGV, Istituto Nazionale di Geofisica e Vulcanologia) |
op_collection_id |
ftjaog |
language |
English |
topic |
Edward VII Peninsula Aeromagnetic anomalies tectonic block west antarctic rift system Marie Byrd Land antartica 04.05.04. Magnetic anomalies |
spellingShingle |
Edward VII Peninsula Aeromagnetic anomalies tectonic block west antarctic rift system Marie Byrd Land antartica 04.05.04. Magnetic anomalies Ferraccioli, F. Damaske, D. Bozzo, E. Spano, M. Chiappini, M. Magnetic anomaly patterns over crustal blocks of the King Edward VII Peninsula, Marie Byrd Land, West Antarctica |
topic_facet |
Edward VII Peninsula Aeromagnetic anomalies tectonic block west antarctic rift system Marie Byrd Land antartica 04.05.04. Magnetic anomalies |
description |
Within the framework of the GITARA II project an aeromagnetic survey was performed during the GANOVEXVII expedition (1992/1993) over the King Edward VII Peninsula in northwestern Marie Byrd Land (West Antarctica). This region which may represent the eastern flank of the Ross Sea rift system had previously been explored only at reconnaissance level. New total field and upward continued (10 km) magnetic anomaly maps are produced and interpreted here to map and discuss the crustal structure of the Edward VII Peninsula. Tworound-shaped, high-amplitude magnetic anomalies are recognised over the Alexandra Mountains block. The anomalies are difficult to interpret since susceptibility data indicate the prevalence of non-magnetic rocks at the surface. A possible interpretation is that the anomalies are due to Cretaceous mafic intrusives distinct from weakly magnetic Byrd Coast Granite of the adjacent Rockefeller Mountains block. Alternatively the anomalies could be related to buried pluton-sized Devonian Ford Granodiorite intruded by dikes. If Cretaceous in age, the former intrusives revealed from the magnetics could also be responsible for contact metamorphism of the adjacent Alexandra Mountains migmatites. Lower amplitude circular anomalies over the Central Plateau and Prestrud Inlet are likely to be caused by unexposed Devonian Ford Granodiorite which crops out in the Ford Ranges. Elongated high-frequency anomalies of the Sulzberger Bay are similar to those recognised over seismically constrained Cenozoic rift-related volcanics of the Ross Sea. A broad magnetic low over the Sulzberger Ice Shelf may be indicative of a fault bounded graben-like basin with sedimentary infill. Overall recognition of magnetic anomaly patterns and trends reveals segmentation of the Edward VII Peninsula and of the adjacent marine areas in distinct crustal blocks. Faults may separate these blocks and they are interpreted to reflect multiple Cretaceous and maybe Cenozoic crustal extension\uplift phases within this part of the West Antarctic rift system. |
format |
Article in Journal/Newspaper |
author |
Ferraccioli, F. Damaske, D. Bozzo, E. Spano, M. Chiappini, M. |
author_facet |
Ferraccioli, F. Damaske, D. Bozzo, E. Spano, M. Chiappini, M. |
author_sort |
Ferraccioli, F. |
title |
Magnetic anomaly patterns over crustal blocks of the King Edward VII Peninsula, Marie Byrd Land, West Antarctica |
title_short |
Magnetic anomaly patterns over crustal blocks of the King Edward VII Peninsula, Marie Byrd Land, West Antarctica |
title_full |
Magnetic anomaly patterns over crustal blocks of the King Edward VII Peninsula, Marie Byrd Land, West Antarctica |
title_fullStr |
Magnetic anomaly patterns over crustal blocks of the King Edward VII Peninsula, Marie Byrd Land, West Antarctica |
title_full_unstemmed |
Magnetic anomaly patterns over crustal blocks of the King Edward VII Peninsula, Marie Byrd Land, West Antarctica |
title_sort |
magnetic anomaly patterns over crustal blocks of the king edward vii peninsula, marie byrd land, west antarctica |
publisher |
Istituto Nazionale di Geofisica e Vulcanologia, INGV |
publishDate |
2000 |
url |
https://www.annalsofgeophysics.eu/index.php/annals/article/view/3634 https://doi.org/10.4401/ag-3634 |
long_lat |
ENVELOPE(-130.000,-130.000,-78.000,-78.000) ENVELOPE(-152.000,-152.000,-77.000,-77.000) ENVELOPE(-145.000,-145.000,-77.000,-77.000) ENVELOPE(-165.117,-165.117,-86.567,-86.567) ENVELOPE(-155.000,-155.000,-77.667,-77.667) ENVELOPE(-148.000,-148.000,-77.000,-77.000) ENVELOPE(-153.500,-153.500,-77.417,-77.417) ENVELOPE(-155.000,-155.000,-78.000,-78.000) ENVELOPE(-156.000,-156.000,-78.300,-78.300) |
geographic |
Antarctic Ross Sea West Antarctica Byrd Marie Byrd Land Sulzberger Bay Ford Ranges Prestrud Edward VII Peninsula Sulzberger Ice Shelf Alexandra Mountains Rockefeller Mountains Prestrud Inlet |
geographic_facet |
Antarctic Ross Sea West Antarctica Byrd Marie Byrd Land Sulzberger Bay Ford Ranges Prestrud Edward VII Peninsula Sulzberger Ice Shelf Alexandra Mountains Rockefeller Mountains Prestrud Inlet |
genre |
Antarc* Antarctic Antarctica antartic* Ice Shelf Marie Byrd Land Ross Sea Sulzberger Bay Sulzberger Ice Shelf West Antarctica |
genre_facet |
Antarc* Antarctic Antarctica antartic* Ice Shelf Marie Byrd Land Ross Sea Sulzberger Bay Sulzberger Ice Shelf West Antarctica |
op_source |
Annals of Geophysics; V. 43 N. 2 (2000) Annals of Geophysics; Vol. 43 No. 2 (2000) 2037-416X 1593-5213 |
op_relation |
https://www.annalsofgeophysics.eu/index.php/annals/article/view/3634/3689 https://www.annalsofgeophysics.eu/index.php/annals/article/view/3634 doi:10.4401/ag-3634 |
op_doi |
https://doi.org/10.4401/ag-3634 |
container_title |
Annals of Geophysics |
container_volume |
43 |
container_issue |
2 |
_version_ |
1766261007119810560 |