The form, distribution and anisotropy of magnetic susceptibility of Jurassic dykes in H.U. Sverdrupfjella, Dronning Maud Land, Antarctica. Implications for dyke swarm emplacement
The Mesozoic dyke swarms of Western Dronning Maud Land, Antarctica, form a minor intrusive component of the Karoo large igneous province. Five-hundred and sixty one dykes were recorded intruding Neoproterozoic gneisses and Middle Jurassic syenite plutons. Ar-40/Ar-39 geochronology data reveal two te...
Published in: | Journal of Structural Geology |
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ftnerc:oai:nora.nerc.ac.uk:11440 2023-05-15T13:45:10+02:00 The form, distribution and anisotropy of magnetic susceptibility of Jurassic dykes in H.U. Sverdrupfjella, Dronning Maud Land, Antarctica. Implications for dyke swarm emplacement Curtis, Michael L. Riley, Teal R. Owens, William H. Leat, Philip T. Duncan, Robert A. 2008 http://nora.nerc.ac.uk/id/eprint/11440/ http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6V9D-4TDK6NK-1&_user=1773399&_coverDate=11%2F30%2F2008&_rdoc=1&_fmt=high&_orig=search&_origin=search&_sort=d&_docanchor=&view=c&_searchStrId=1604953188&_rerunOrigin=google&_acct=C000054485&_version unknown Elsevier Curtis, Michael L.; Riley, Teal R. orcid:0000-0002-3333-5021 Owens, William H.; Leat, Philip T.; Duncan, Robert A. 2008 The form, distribution and anisotropy of magnetic susceptibility of Jurassic dykes in H.U. Sverdrupfjella, Dronning Maud Land, Antarctica. Implications for dyke swarm emplacement. Journal of Structural Geology, 30 (11). 1429-1447. https://doi.org/10.1016/j.jsg.2008.08.004 <https://doi.org/10.1016/j.jsg.2008.08.004> Earth Sciences Publication - Article PeerReviewed 2008 ftnerc https://doi.org/10.1016/j.jsg.2008.08.004 2023-02-04T19:27:21Z The Mesozoic dyke swarms of Western Dronning Maud Land, Antarctica, form a minor intrusive component of the Karoo large igneous province. Five-hundred and sixty one dykes were recorded intruding Neoproterozoic gneisses and Middle Jurassic syenite plutons. Ar-40/Ar-39 geochronology data reveal two temporally distinct components: the 178-175 Ma, alkaline. Straumsvola dyke swarm that predominantly intrudes a nepheline syenite pluton; and the 206-204 Ma, tholeiitic, Jutulrora dyke swarm found throughout the study area. The Straumsvola swarm exhibits highly variably dyke trends that display a restricted opening direction, interpreted to be the result of high magma pressure equal to the maximum principal stress. The Jutulrora swarm displays a fan of dyke trends, with dyke thickness and spacing increasing away from the inferred point of fan convergence. Anisotropy of magnetic susceptibility measurements reveal vertical magma transport within both dyke swarms in the Straumsvola area, with the Southern/outer exposures of the Jutulrora swarm exhibiting lateral magma transport. Although associated with a long-lived, local igneous centre comparison of palaeostress estimates for the Straumsvola dyke swarm and contemporaneous dykes in Ahlmannryggen and Vestfjella, indicates the presence of a regional scale radial stress system in western Dronning Maud Land between 178-175 Ma, supporting a mantle plume origin for the Karoo large igneous province. Article in Journal/Newspaper Antarc* Antarctica Dronning Maud Land Natural Environment Research Council: NERC Open Research Archive Ahlmannryggen ENVELOPE(-2.500,-2.500,-71.833,-71.833) Dronning Maud Land Jutulrora ENVELOPE(-0.500,-0.500,-72.250,-72.250) Straumsvola ENVELOPE(-0.333,-0.333,-72.117,-72.117) Sverdrupfjella ENVELOPE(0.583,0.583,-72.700,-72.700) Vestfjella ENVELOPE(-14.000,-14.000,-73.167,-73.167) Journal of Structural Geology 30 11 1429 1447 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
unknown |
topic |
Earth Sciences |
spellingShingle |
Earth Sciences Curtis, Michael L. Riley, Teal R. Owens, William H. Leat, Philip T. Duncan, Robert A. The form, distribution and anisotropy of magnetic susceptibility of Jurassic dykes in H.U. Sverdrupfjella, Dronning Maud Land, Antarctica. Implications for dyke swarm emplacement |
topic_facet |
Earth Sciences |
description |
The Mesozoic dyke swarms of Western Dronning Maud Land, Antarctica, form a minor intrusive component of the Karoo large igneous province. Five-hundred and sixty one dykes were recorded intruding Neoproterozoic gneisses and Middle Jurassic syenite plutons. Ar-40/Ar-39 geochronology data reveal two temporally distinct components: the 178-175 Ma, alkaline. Straumsvola dyke swarm that predominantly intrudes a nepheline syenite pluton; and the 206-204 Ma, tholeiitic, Jutulrora dyke swarm found throughout the study area. The Straumsvola swarm exhibits highly variably dyke trends that display a restricted opening direction, interpreted to be the result of high magma pressure equal to the maximum principal stress. The Jutulrora swarm displays a fan of dyke trends, with dyke thickness and spacing increasing away from the inferred point of fan convergence. Anisotropy of magnetic susceptibility measurements reveal vertical magma transport within both dyke swarms in the Straumsvola area, with the Southern/outer exposures of the Jutulrora swarm exhibiting lateral magma transport. Although associated with a long-lived, local igneous centre comparison of palaeostress estimates for the Straumsvola dyke swarm and contemporaneous dykes in Ahlmannryggen and Vestfjella, indicates the presence of a regional scale radial stress system in western Dronning Maud Land between 178-175 Ma, supporting a mantle plume origin for the Karoo large igneous province. |
format |
Article in Journal/Newspaper |
author |
Curtis, Michael L. Riley, Teal R. Owens, William H. Leat, Philip T. Duncan, Robert A. |
author_facet |
Curtis, Michael L. Riley, Teal R. Owens, William H. Leat, Philip T. Duncan, Robert A. |
author_sort |
Curtis, Michael L. |
title |
The form, distribution and anisotropy of magnetic susceptibility of Jurassic dykes in H.U. Sverdrupfjella, Dronning Maud Land, Antarctica. Implications for dyke swarm emplacement |
title_short |
The form, distribution and anisotropy of magnetic susceptibility of Jurassic dykes in H.U. Sverdrupfjella, Dronning Maud Land, Antarctica. Implications for dyke swarm emplacement |
title_full |
The form, distribution and anisotropy of magnetic susceptibility of Jurassic dykes in H.U. Sverdrupfjella, Dronning Maud Land, Antarctica. Implications for dyke swarm emplacement |
title_fullStr |
The form, distribution and anisotropy of magnetic susceptibility of Jurassic dykes in H.U. Sverdrupfjella, Dronning Maud Land, Antarctica. Implications for dyke swarm emplacement |
title_full_unstemmed |
The form, distribution and anisotropy of magnetic susceptibility of Jurassic dykes in H.U. Sverdrupfjella, Dronning Maud Land, Antarctica. Implications for dyke swarm emplacement |
title_sort |
form, distribution and anisotropy of magnetic susceptibility of jurassic dykes in h.u. sverdrupfjella, dronning maud land, antarctica. implications for dyke swarm emplacement |
publisher |
Elsevier |
publishDate |
2008 |
url |
http://nora.nerc.ac.uk/id/eprint/11440/ http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6V9D-4TDK6NK-1&_user=1773399&_coverDate=11%2F30%2F2008&_rdoc=1&_fmt=high&_orig=search&_origin=search&_sort=d&_docanchor=&view=c&_searchStrId=1604953188&_rerunOrigin=google&_acct=C000054485&_version |
long_lat |
ENVELOPE(-2.500,-2.500,-71.833,-71.833) ENVELOPE(-0.500,-0.500,-72.250,-72.250) ENVELOPE(-0.333,-0.333,-72.117,-72.117) ENVELOPE(0.583,0.583,-72.700,-72.700) ENVELOPE(-14.000,-14.000,-73.167,-73.167) |
geographic |
Ahlmannryggen Dronning Maud Land Jutulrora Straumsvola Sverdrupfjella Vestfjella |
geographic_facet |
Ahlmannryggen Dronning Maud Land Jutulrora Straumsvola Sverdrupfjella Vestfjella |
genre |
Antarc* Antarctica Dronning Maud Land |
genre_facet |
Antarc* Antarctica Dronning Maud Land |
op_relation |
Curtis, Michael L.; Riley, Teal R. orcid:0000-0002-3333-5021 Owens, William H.; Leat, Philip T.; Duncan, Robert A. 2008 The form, distribution and anisotropy of magnetic susceptibility of Jurassic dykes in H.U. Sverdrupfjella, Dronning Maud Land, Antarctica. Implications for dyke swarm emplacement. Journal of Structural Geology, 30 (11). 1429-1447. https://doi.org/10.1016/j.jsg.2008.08.004 <https://doi.org/10.1016/j.jsg.2008.08.004> |
op_doi |
https://doi.org/10.1016/j.jsg.2008.08.004 |
container_title |
Journal of Structural Geology |
container_volume |
30 |
container_issue |
11 |
container_start_page |
1429 |
op_container_end_page |
1447 |
_version_ |
1766214570179821568 |