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 km 2 Cretaceous Lassiter Coast Intrusive Suite, during the accretionary mid-Cretace...
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Geological Society of London
2016
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Online Access: | https://dx.doi.org/10.6084/m9.figshare.3453137 https://geolsoc.figshare.com/articles/dataset/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/3453137/1 |
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ftdatacite:10.6084/m9.figshare.3453137 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 Kelley, Simon P. Barry, Tiffany L. Curtis, Michael L. 2016 https://dx.doi.org/10.6084/m9.figshare.3453137 https://geolsoc.figshare.com/articles/dataset/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/3453137/1 unknown Geological Society of London https://dx.doi.org/10.1144/jgs2011-160 Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 CC-BY Geology FOS Earth and related environmental sciences dataset Dataset 2016 ftdatacite https://doi.org/10.6084/m9.figshare.3453137 https://doi.org/10.1144/jgs2011-160 2021-11-05T12:55:41Z 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 km 2 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. Dataset Palmer Land DataCite Metadata Store (German National Library of Science and Technology) Beaumont Glacier ENVELOPE(-62.250,-62.250,-72.000,-72.000) Lassiter ENVELOPE(-62.000,-62.000,-73.750,-73.750) Lassiter Coast ENVELOPE(-62.000,-62.000,-74.000,-74.000) Palmer Land ENVELOPE(-65.000,-65.000,-71.500,-71.500) |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
unknown |
topic |
Geology FOS Earth and related environmental sciences |
spellingShingle |
Geology FOS Earth and related environmental sciences Vaughan, Alan P. M. Storey, Craig Kelley, 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 |
Geology FOS Earth and related environmental 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 km 2 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 |
Dataset |
author |
Vaughan, Alan P. M. Storey, Craig Kelley, Simon P. Barry, Tiffany L. Curtis, Michael L. |
author_facet |
Vaughan, Alan P. M. Storey, Craig Kelley, 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 |
publisher |
Geological Society of London |
publishDate |
2016 |
url |
https://dx.doi.org/10.6084/m9.figshare.3453137 https://geolsoc.figshare.com/articles/dataset/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/3453137/1 |
long_lat |
ENVELOPE(-62.250,-62.250,-72.000,-72.000) ENVELOPE(-62.000,-62.000,-73.750,-73.750) ENVELOPE(-62.000,-62.000,-74.000,-74.000) ENVELOPE(-65.000,-65.000,-71.500,-71.500) |
geographic |
Beaumont Glacier Lassiter Lassiter Coast Palmer Land |
geographic_facet |
Beaumont Glacier Lassiter Lassiter Coast Palmer Land |
genre |
Palmer Land |
genre_facet |
Palmer Land |
op_relation |
https://dx.doi.org/10.1144/jgs2011-160 |
op_rights |
Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.6084/m9.figshare.3453137 https://doi.org/10.1144/jgs2011-160 |
_version_ |
1766162166303424512 |