Mid-Cretaceous ductile deformation on the Eastern Palmer Land Shear Zone, Antarctica, and implications for timing of Mesozoic terrane collision
Ar–Ar dating of high-strain ductile mylonites of the Eastern Palmer Land Shear Zone in the southern Antarctic Peninsula indicates that reverse movement on the shear zone occurred in late Early Cretaceous times (Albian), and not latest Jurassic times as previously supposed. The Eastern Palmer Land Sh...
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crcambridgeupr:10.1017/s0016756802006672 2024-03-03T08:37:39+00:00 Mid-Cretaceous ductile deformation on the Eastern Palmer Land Shear Zone, Antarctica, and implications for timing of Mesozoic terrane collision VAUGHAN, ALAN P. M. KELLEY, SIMON P. STOREY, BRYAN C. 2002 http://dx.doi.org/10.1017/s0016756802006672 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0016756802006672 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Geological Magazine volume 139, issue 4, page 465-471 ISSN 0016-7568 1469-5081 Geology journal-article 2002 crcambridgeupr https://doi.org/10.1017/s0016756802006672 2024-02-08T08:43:15Z Ar–Ar dating of high-strain ductile mylonites of the Eastern Palmer Land Shear Zone in the southern Antarctic Peninsula indicates that reverse movement on the shear zone occurred in late Early Cretaceous times (Albian), and not latest Jurassic times as previously supposed. The Eastern Palmer Land Shear Zone forms a major tectonic boundary, separating suspect arc terranes from rocks of Gondwana continental affinity. The dated mylonites are developed in Lower Jurassic plutonic rocks at Mount Sullivan, eastern Palmer Land, and form part of a zone of ductile reverse deformation up to 25 km wide. Biotite from a fine-grained mafic mylonite yields an Ar–Ar cooling age of 102.8±3.3 Ma. Movement of this age on the Eastern Palmer Land Shear Zone is coeval with circum-Pacific deformation, possibly related to a mantle superplume event, and provides support for allochthonous-terrane models for the Antarctic Peninsula with accretion in post-Early Cretaceous times. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica Palmer Land Cambridge University Press Antarctic The Antarctic Antarctic Peninsula Pacific Sullivan ENVELOPE(-63.817,-63.817,-69.650,-69.650) Palmer Land ENVELOPE(-65.000,-65.000,-71.500,-71.500) Mount Sullivan ENVELOPE(155.017,155.017,-80.217,-80.217) Geological Magazine 139 4 465 471 |
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Open Polar |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
topic |
Geology |
spellingShingle |
Geology VAUGHAN, ALAN P. M. KELLEY, SIMON P. STOREY, BRYAN C. Mid-Cretaceous ductile deformation on the Eastern Palmer Land Shear Zone, Antarctica, and implications for timing of Mesozoic terrane collision |
topic_facet |
Geology |
description |
Ar–Ar dating of high-strain ductile mylonites of the Eastern Palmer Land Shear Zone in the southern Antarctic Peninsula indicates that reverse movement on the shear zone occurred in late Early Cretaceous times (Albian), and not latest Jurassic times as previously supposed. The Eastern Palmer Land Shear Zone forms a major tectonic boundary, separating suspect arc terranes from rocks of Gondwana continental affinity. The dated mylonites are developed in Lower Jurassic plutonic rocks at Mount Sullivan, eastern Palmer Land, and form part of a zone of ductile reverse deformation up to 25 km wide. Biotite from a fine-grained mafic mylonite yields an Ar–Ar cooling age of 102.8±3.3 Ma. Movement of this age on the Eastern Palmer Land Shear Zone is coeval with circum-Pacific deformation, possibly related to a mantle superplume event, and provides support for allochthonous-terrane models for the Antarctic Peninsula with accretion in post-Early Cretaceous times. |
format |
Article in Journal/Newspaper |
author |
VAUGHAN, ALAN P. M. KELLEY, SIMON P. STOREY, BRYAN C. |
author_facet |
VAUGHAN, ALAN P. M. KELLEY, SIMON P. STOREY, BRYAN C. |
author_sort |
VAUGHAN, ALAN P. M. |
title |
Mid-Cretaceous ductile deformation on the Eastern Palmer Land Shear Zone, Antarctica, and implications for timing of Mesozoic terrane collision |
title_short |
Mid-Cretaceous ductile deformation on the Eastern Palmer Land Shear Zone, Antarctica, and implications for timing of Mesozoic terrane collision |
title_full |
Mid-Cretaceous ductile deformation on the Eastern Palmer Land Shear Zone, Antarctica, and implications for timing of Mesozoic terrane collision |
title_fullStr |
Mid-Cretaceous ductile deformation on the Eastern Palmer Land Shear Zone, Antarctica, and implications for timing of Mesozoic terrane collision |
title_full_unstemmed |
Mid-Cretaceous ductile deformation on the Eastern Palmer Land Shear Zone, Antarctica, and implications for timing of Mesozoic terrane collision |
title_sort |
mid-cretaceous ductile deformation on the eastern palmer land shear zone, antarctica, and implications for timing of mesozoic terrane collision |
publisher |
Cambridge University Press (CUP) |
publishDate |
2002 |
url |
http://dx.doi.org/10.1017/s0016756802006672 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0016756802006672 |
long_lat |
ENVELOPE(-63.817,-63.817,-69.650,-69.650) ENVELOPE(-65.000,-65.000,-71.500,-71.500) ENVELOPE(155.017,155.017,-80.217,-80.217) |
geographic |
Antarctic The Antarctic Antarctic Peninsula Pacific Sullivan Palmer Land Mount Sullivan |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula Pacific Sullivan Palmer Land Mount Sullivan |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica Palmer Land |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica Palmer Land |
op_source |
Geological Magazine volume 139, issue 4, page 465-471 ISSN 0016-7568 1469-5081 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0016756802006672 |
container_title |
Geological Magazine |
container_volume |
139 |
container_issue |
4 |
container_start_page |
465 |
op_container_end_page |
471 |
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1792500493408272384 |