Synkinematic emplacement of Lassiter Coast Intrusive Suite plutons during the Palmer Land Event:evidence for mid-Cretaceous sinistral transpression at the Beaumont Glacier in eastern Palmer Land
New structural and geochronological data from the Eastern Palmer Land Shear Zone, in the vicinity of Beaumont Glacier, provide the first evidence of dated structural control on emplacement of the 119–95 Ma, >13000 km2 Cretaceous Lassiter Coast Intrusive Suite, during the accretionary mid-Cretaceo...
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2012
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Online Access: | https://doi.org/10.1144/jgs2011-160 https://researchportal.port.ac.uk/portal/en/publications/synkinematic-emplacement-of-lassiter-coast-intrusive-suite-plutons-during-the-palmer-land-event(40c66b52-12bb-4d11-ac83-c6e13495964c).html |
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ftunivportsmpubl:oai:researchportal.port.ac.uk:publications/40c66b52-12bb-4d11-ac83-c6e13495964c 2023-05-15T17:54:24+02:00 Synkinematic emplacement of Lassiter Coast Intrusive Suite plutons during the Palmer Land Event:evidence for mid-Cretaceous sinistral transpression at the Beaumont Glacier in eastern Palmer Land Vaughan, Alan P. M. Storey, Craig Kelly, Simon P. Barry, Tiffany L. Curtis, Michael L. 2012 https://doi.org/10.1144/jgs2011-160 https://researchportal.port.ac.uk/portal/en/publications/synkinematic-emplacement-of-lassiter-coast-intrusive-suite-plutons-during-the-palmer-land-event(40c66b52-12bb-4d11-ac83-c6e13495964c).html eng eng info:eu-repo/semantics/restrictedAccess Vaughan , A P M , Storey , C , Kelly , S P , Barry , T L & Curtis , M L 2012 , ' Synkinematic emplacement of Lassiter Coast Intrusive Suite plutons during the Palmer Land Event : evidence for mid-Cretaceous sinistral transpression at the Beaumont Glacier in eastern Palmer Land ' Journal of the Geological Society , vol 169 , no. 6 , pp. 759-771 . DOI:10.1144/jgs2011-160 /dk/atira/pure/core/subjects/earthsci Earth Sciences article 2012 ftunivportsmpubl https://doi.org/10.1144/jgs2011-160 2017-09-28T19:31:44Z New structural and geochronological data from the Eastern Palmer Land Shear Zone, in the vicinity of Beaumont Glacier, provide the first evidence of dated structural control on emplacement of the 119–95 Ma, >13000 km2 Cretaceous Lassiter Coast Intrusive Suite, during the accretionary mid-Cretaceous Palmer Land Event orogeny. A previously undated >100 m thick dyke-like quartz tonalite intrusion was emplaced at 116.5 ± 1.5 Ma (Ar–Ar biotite cooling age) along a NW–SE axis, coeval with NW–SE compressional deformation, and possibly controlled by sinistral transpression along the Beaumont Glacier shear zone. The quartz tonalite preserves two styles of deformation and was probably progressively deformed by normal-sinistral shearing during magmatic cooling with initial deformation of mafic enclaves in the dyke interior and final formation of proto-mylonite to mylonite on the dyke margin. The quartz tonalite cuts folding associated with Phase 1 of the Palmer Land Event, indicating that this folding is older than 116 Ma, extending the onset of Phase 1 back in time. Mylonite on the quartz tonalite sheet margin was subsequently thermally reset at c. 107 Ma (Ar–Ar biotite method), during a peak in Lassiter Coast Intrusive Suite magmatism. Article in Journal/Newspaper Palmer Land University of Portsmouth: Portsmouth Research Portal Palmer Land ENVELOPE(-65.000,-65.000,-71.500,-71.500) Lassiter ENVELOPE(-62.000,-62.000,-73.750,-73.750) Lassiter Coast ENVELOPE(-62.000,-62.000,-74.000,-74.000) Beaumont Glacier ENVELOPE(-62.250,-62.250,-72.000,-72.000) Journal of the Geological Society 169 6 759 771 |
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Open Polar |
collection |
University of Portsmouth: Portsmouth Research Portal |
op_collection_id |
ftunivportsmpubl |
language |
English |
topic |
/dk/atira/pure/core/subjects/earthsci Earth Sciences |
spellingShingle |
/dk/atira/pure/core/subjects/earthsci Earth Sciences Vaughan, Alan P. M. Storey, Craig Kelly, Simon P. Barry, Tiffany L. Curtis, Michael L. Synkinematic emplacement of Lassiter Coast Intrusive Suite plutons during the Palmer Land Event:evidence for mid-Cretaceous sinistral transpression at the Beaumont Glacier in eastern Palmer Land |
topic_facet |
/dk/atira/pure/core/subjects/earthsci Earth Sciences |
description |
New structural and geochronological data from the Eastern Palmer Land Shear Zone, in the vicinity of Beaumont Glacier, provide the first evidence of dated structural control on emplacement of the 119–95 Ma, >13000 km2 Cretaceous Lassiter Coast Intrusive Suite, during the accretionary mid-Cretaceous Palmer Land Event orogeny. A previously undated >100 m thick dyke-like quartz tonalite intrusion was emplaced at 116.5 ± 1.5 Ma (Ar–Ar biotite cooling age) along a NW–SE axis, coeval with NW–SE compressional deformation, and possibly controlled by sinistral transpression along the Beaumont Glacier shear zone. The quartz tonalite preserves two styles of deformation and was probably progressively deformed by normal-sinistral shearing during magmatic cooling with initial deformation of mafic enclaves in the dyke interior and final formation of proto-mylonite to mylonite on the dyke margin. The quartz tonalite cuts folding associated with Phase 1 of the Palmer Land Event, indicating that this folding is older than 116 Ma, extending the onset of Phase 1 back in time. Mylonite on the quartz tonalite sheet margin was subsequently thermally reset at c. 107 Ma (Ar–Ar biotite method), during a peak in Lassiter Coast Intrusive Suite magmatism. |
format |
Article in Journal/Newspaper |
author |
Vaughan, Alan P. M. Storey, Craig Kelly, Simon P. Barry, Tiffany L. Curtis, Michael L. |
author_facet |
Vaughan, Alan P. M. Storey, Craig Kelly, Simon P. Barry, Tiffany L. Curtis, Michael L. |
author_sort |
Vaughan, Alan P. M. |
title |
Synkinematic emplacement of Lassiter Coast Intrusive Suite plutons during the Palmer Land Event:evidence for mid-Cretaceous sinistral transpression at the Beaumont Glacier in eastern Palmer Land |
title_short |
Synkinematic emplacement of Lassiter Coast Intrusive Suite plutons during the Palmer Land Event:evidence for mid-Cretaceous sinistral transpression at the Beaumont Glacier in eastern Palmer Land |
title_full |
Synkinematic emplacement of Lassiter Coast Intrusive Suite plutons during the Palmer Land Event:evidence for mid-Cretaceous sinistral transpression at the Beaumont Glacier in eastern Palmer Land |
title_fullStr |
Synkinematic emplacement of Lassiter Coast Intrusive Suite plutons during the Palmer Land Event:evidence for mid-Cretaceous sinistral transpression at the Beaumont Glacier in eastern Palmer Land |
title_full_unstemmed |
Synkinematic emplacement of Lassiter Coast Intrusive Suite plutons during the Palmer Land Event:evidence for mid-Cretaceous sinistral transpression at the Beaumont Glacier in eastern Palmer Land |
title_sort |
synkinematic emplacement of lassiter coast intrusive suite plutons during the palmer land event:evidence for mid-cretaceous sinistral transpression at the beaumont glacier in eastern palmer land |
publishDate |
2012 |
url |
https://doi.org/10.1144/jgs2011-160 https://researchportal.port.ac.uk/portal/en/publications/synkinematic-emplacement-of-lassiter-coast-intrusive-suite-plutons-during-the-palmer-land-event(40c66b52-12bb-4d11-ac83-c6e13495964c).html |
long_lat |
ENVELOPE(-65.000,-65.000,-71.500,-71.500) ENVELOPE(-62.000,-62.000,-73.750,-73.750) ENVELOPE(-62.000,-62.000,-74.000,-74.000) ENVELOPE(-62.250,-62.250,-72.000,-72.000) |
geographic |
Palmer Land Lassiter Lassiter Coast Beaumont Glacier |
geographic_facet |
Palmer Land Lassiter Lassiter Coast Beaumont Glacier |
genre |
Palmer Land |
genre_facet |
Palmer Land |
op_source |
Vaughan , A P M , Storey , C , Kelly , S P , Barry , T L & Curtis , M L 2012 , ' Synkinematic emplacement of Lassiter Coast Intrusive Suite plutons during the Palmer Land Event : evidence for mid-Cretaceous sinistral transpression at the Beaumont Glacier in eastern Palmer Land ' Journal of the Geological Society , vol 169 , no. 6 , pp. 759-771 . DOI:10.1144/jgs2011-160 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1144/jgs2011-160 |
container_title |
Journal of the Geological Society |
container_volume |
169 |
container_issue |
6 |
container_start_page |
759 |
op_container_end_page |
771 |
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1766162165919645696 |