Magnetic fabric and tectonic setting of the Early to Middle Jurassic felsic dykes at Pitt Point and Mount Reece, eastern Graham Land, Antarctica
Abstract At Pitt Point, the east coast of Graham Land (Antarctic Peninsula), the Early to Middle Jurassic (Toarcian–Aalenian) rhyolite dykes form two coevally emplaced NNE–SSW and E–W trending sets. The nearly perpendicular dyke sets define a large-scale chocolate-tablet structure, implying biaxial...
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crcambridgeupr:10.1017/s0954102011000599 2024-09-09T19:07:30+00:00 Magnetic fabric and tectonic setting of the Early to Middle Jurassic felsic dykes at Pitt Point and Mount Reece, eastern Graham Land, Antarctica Žák, Jiří Soejono, Igor Janoušek, Vojtěch Venera, Zdeněk 2011 http://dx.doi.org/10.1017/s0954102011000599 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102011000599 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Antarctic Science volume 24, issue 1, page 45-58 ISSN 0954-1020 1365-2079 journal-article 2011 crcambridgeupr https://doi.org/10.1017/s0954102011000599 2024-06-19T04:04:19Z Abstract At Pitt Point, the east coast of Graham Land (Antarctic Peninsula), the Early to Middle Jurassic (Toarcian–Aalenian) rhyolite dykes form two coevally emplaced NNE–SSW and E–W trending sets. The nearly perpendicular dyke sets define a large-scale chocolate-tablet structure, implying biaxial principal extension in the WNW–ESE and N–S directions. Along the nearby north-eastern slope of Mount Reece, the WNW–ESE set locally dominates suggesting variations in the direction and amount of extension. Magnetic fabric in the dykes, revealed using the anisotropy of magnetic susceptibility (AMS) method, indicates dip-parallel to dip-oblique (?upward) magma flow. The dykes are interpreted as representing sub-volcanic feeder zones above a felsic magma source. The dyke emplacement was synchronous with the initial stages of the Weddell Sea opening during Gondwana break-up, but it remains unclear whether it was driven by regional stress field, local stress field above a larger plutonic body, or by an interaction of both. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctic Science Antarctica Graham Land Weddell Sea Cambridge University Press Antarctic Antarctic Peninsula Graham Land ENVELOPE(-63.500,-63.500,-66.000,-66.000) Mount Reece ENVELOPE(169.717,169.717,-77.500,-77.500) Pitt Point ENVELOPE(-58.387,-58.387,-63.848,-63.848) Reece ENVELOPE(-58.533,-58.533,-63.833,-63.833) Weddell Weddell Sea Antarctic Science 24 1 45 58 |
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Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
description |
Abstract At Pitt Point, the east coast of Graham Land (Antarctic Peninsula), the Early to Middle Jurassic (Toarcian–Aalenian) rhyolite dykes form two coevally emplaced NNE–SSW and E–W trending sets. The nearly perpendicular dyke sets define a large-scale chocolate-tablet structure, implying biaxial principal extension in the WNW–ESE and N–S directions. Along the nearby north-eastern slope of Mount Reece, the WNW–ESE set locally dominates suggesting variations in the direction and amount of extension. Magnetic fabric in the dykes, revealed using the anisotropy of magnetic susceptibility (AMS) method, indicates dip-parallel to dip-oblique (?upward) magma flow. The dykes are interpreted as representing sub-volcanic feeder zones above a felsic magma source. The dyke emplacement was synchronous with the initial stages of the Weddell Sea opening during Gondwana break-up, but it remains unclear whether it was driven by regional stress field, local stress field above a larger plutonic body, or by an interaction of both. |
format |
Article in Journal/Newspaper |
author |
Žák, Jiří Soejono, Igor Janoušek, Vojtěch Venera, Zdeněk |
spellingShingle |
Žák, Jiří Soejono, Igor Janoušek, Vojtěch Venera, Zdeněk Magnetic fabric and tectonic setting of the Early to Middle Jurassic felsic dykes at Pitt Point and Mount Reece, eastern Graham Land, Antarctica |
author_facet |
Žák, Jiří Soejono, Igor Janoušek, Vojtěch Venera, Zdeněk |
author_sort |
Žák, Jiří |
title |
Magnetic fabric and tectonic setting of the Early to Middle Jurassic felsic dykes at Pitt Point and Mount Reece, eastern Graham Land, Antarctica |
title_short |
Magnetic fabric and tectonic setting of the Early to Middle Jurassic felsic dykes at Pitt Point and Mount Reece, eastern Graham Land, Antarctica |
title_full |
Magnetic fabric and tectonic setting of the Early to Middle Jurassic felsic dykes at Pitt Point and Mount Reece, eastern Graham Land, Antarctica |
title_fullStr |
Magnetic fabric and tectonic setting of the Early to Middle Jurassic felsic dykes at Pitt Point and Mount Reece, eastern Graham Land, Antarctica |
title_full_unstemmed |
Magnetic fabric and tectonic setting of the Early to Middle Jurassic felsic dykes at Pitt Point and Mount Reece, eastern Graham Land, Antarctica |
title_sort |
magnetic fabric and tectonic setting of the early to middle jurassic felsic dykes at pitt point and mount reece, eastern graham land, antarctica |
publisher |
Cambridge University Press (CUP) |
publishDate |
2011 |
url |
http://dx.doi.org/10.1017/s0954102011000599 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102011000599 |
long_lat |
ENVELOPE(-63.500,-63.500,-66.000,-66.000) ENVELOPE(169.717,169.717,-77.500,-77.500) ENVELOPE(-58.387,-58.387,-63.848,-63.848) ENVELOPE(-58.533,-58.533,-63.833,-63.833) |
geographic |
Antarctic Antarctic Peninsula Graham Land Mount Reece Pitt Point Reece Weddell Weddell Sea |
geographic_facet |
Antarctic Antarctic Peninsula Graham Land Mount Reece Pitt Point Reece Weddell Weddell Sea |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctic Science Antarctica Graham Land Weddell Sea |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctic Science Antarctica Graham Land Weddell Sea |
op_source |
Antarctic Science volume 24, issue 1, page 45-58 ISSN 0954-1020 1365-2079 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0954102011000599 |
container_title |
Antarctic Science |
container_volume |
24 |
container_issue |
1 |
container_start_page |
45 |
op_container_end_page |
58 |
_version_ |
1809821539169730560 |