Mesozoic tectonic evolution of the south Orkney microcontinent, Scotia arc, Antarctica
The South Orkney Islands are the exposed part of a continental fragment on the southern limb of the Scotia are. The islands are to a large extent composed of metapelites and metagreywackes of probable Triassic sedimentary age. Deformation related to an accretionary wedge setting, with associated met...
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Cambridge University Press
2014
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ftunivesp:oai:acervodigital.unesp.br:11449/36781 2023-05-15T13:52:11+02:00 Mesozoic tectonic evolution of the south Orkney microcontinent, Scotia arc, Antarctica Trouw, RAJ Passchier, C. W. Simoes, LSA Andreis, R. R. Valeriano, C. M. Universidade Estadual Paulista (UNESP) 2014-05-20T15:26:38Z http://acervodigital.unesp.br/handle/11449/36781 http://hdl.handle.net/11449/36781 https://doi.org/10.1017/S0016756897007036 eng eng Cambridge University Press Geological Magazine Geological Magazine. New York: Cambridge Univ Press, v. 134, n. 3, p. 383-401, 1997. 0016-7568 http://hdl.handle.net/11449/36781 http://acervodigital.unesp.br/handle/11449/36781 doi:10.1017/S0016756897007036 WOS:A1997XF52600009 WOSA1997XF52600009.pdf http://dx.doi.org/10.1017/S0016756897007036 info:eu-repo/semantics/closedAccess outro 2014 ftunivesp https://doi.org/10.1017/S0016756897007036 2021-07-18T08:35:16Z The South Orkney Islands are the exposed part of a continental fragment on the southern limb of the Scotia are. The islands are to a large extent composed of metapelites and metagreywackes of probable Triassic sedimentary age. Deformation related to an accretionary wedge setting, with associated metamorphism from anchizone to the greenschist facies, are of Jurassic age (176-200 Ma). on Powell Island, in the centre of the archipelago, five phases of deformation are recognized. The first three, associated with the main metamorphism, are tentatively correlated with early Jurassic subduction along the Pacific margin of Gondwana. D-4 is a phase of middle to late Jurassic crustal extension associated with uplift. This extension phase may be related to opening of the Rocas Verdes basin in southern Chile, associated with the breakup of Gondwanaland. Upper Jurassic conglomerates cover the metamorphic rocks unconformably. D-5 is a phase of brittle extensional faulting probably associated with Cenozoic opening of the Powell basin west of the archipelago, and with development of the Scotia are. Other/Unknown Material Antarc* Antarctica Powell Island South Orkney Islands Universidade Estadual Paulista São Paulo: Acervo Digital da UNESP / São Paulo State University Pacific Powell Basin ENVELOPE(-49.500,-49.500,-62.250,-62.250) Powell Island ENVELOPE(-45.050,-45.050,-60.700,-60.700) Rocas ENVELOPE(-56.948,-56.948,-63.398,-63.398) South Orkney Islands ENVELOPE(-45.500,-45.500,-60.583,-60.583) Geological Magazine 134 3 383 401 |
institution |
Open Polar |
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Universidade Estadual Paulista São Paulo: Acervo Digital da UNESP / São Paulo State University |
op_collection_id |
ftunivesp |
language |
English |
description |
The South Orkney Islands are the exposed part of a continental fragment on the southern limb of the Scotia are. The islands are to a large extent composed of metapelites and metagreywackes of probable Triassic sedimentary age. Deformation related to an accretionary wedge setting, with associated metamorphism from anchizone to the greenschist facies, are of Jurassic age (176-200 Ma). on Powell Island, in the centre of the archipelago, five phases of deformation are recognized. The first three, associated with the main metamorphism, are tentatively correlated with early Jurassic subduction along the Pacific margin of Gondwana. D-4 is a phase of middle to late Jurassic crustal extension associated with uplift. This extension phase may be related to opening of the Rocas Verdes basin in southern Chile, associated with the breakup of Gondwanaland. Upper Jurassic conglomerates cover the metamorphic rocks unconformably. D-5 is a phase of brittle extensional faulting probably associated with Cenozoic opening of the Powell basin west of the archipelago, and with development of the Scotia are. |
author2 |
Universidade Estadual Paulista (UNESP) |
format |
Other/Unknown Material |
author |
Trouw, RAJ Passchier, C. W. Simoes, LSA Andreis, R. R. Valeriano, C. M. |
spellingShingle |
Trouw, RAJ Passchier, C. W. Simoes, LSA Andreis, R. R. Valeriano, C. M. Mesozoic tectonic evolution of the south Orkney microcontinent, Scotia arc, Antarctica |
author_facet |
Trouw, RAJ Passchier, C. W. Simoes, LSA Andreis, R. R. Valeriano, C. M. |
author_sort |
Trouw, RAJ |
title |
Mesozoic tectonic evolution of the south Orkney microcontinent, Scotia arc, Antarctica |
title_short |
Mesozoic tectonic evolution of the south Orkney microcontinent, Scotia arc, Antarctica |
title_full |
Mesozoic tectonic evolution of the south Orkney microcontinent, Scotia arc, Antarctica |
title_fullStr |
Mesozoic tectonic evolution of the south Orkney microcontinent, Scotia arc, Antarctica |
title_full_unstemmed |
Mesozoic tectonic evolution of the south Orkney microcontinent, Scotia arc, Antarctica |
title_sort |
mesozoic tectonic evolution of the south orkney microcontinent, scotia arc, antarctica |
publisher |
Cambridge University Press |
publishDate |
2014 |
url |
http://acervodigital.unesp.br/handle/11449/36781 http://hdl.handle.net/11449/36781 https://doi.org/10.1017/S0016756897007036 |
long_lat |
ENVELOPE(-49.500,-49.500,-62.250,-62.250) ENVELOPE(-45.050,-45.050,-60.700,-60.700) ENVELOPE(-56.948,-56.948,-63.398,-63.398) ENVELOPE(-45.500,-45.500,-60.583,-60.583) |
geographic |
Pacific Powell Basin Powell Island Rocas South Orkney Islands |
geographic_facet |
Pacific Powell Basin Powell Island Rocas South Orkney Islands |
genre |
Antarc* Antarctica Powell Island South Orkney Islands |
genre_facet |
Antarc* Antarctica Powell Island South Orkney Islands |
op_relation |
Geological Magazine Geological Magazine. New York: Cambridge Univ Press, v. 134, n. 3, p. 383-401, 1997. 0016-7568 http://hdl.handle.net/11449/36781 http://acervodigital.unesp.br/handle/11449/36781 doi:10.1017/S0016756897007036 WOS:A1997XF52600009 WOSA1997XF52600009.pdf http://dx.doi.org/10.1017/S0016756897007036 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1017/S0016756897007036 |
container_title |
Geological Magazine |
container_volume |
134 |
container_issue |
3 |
container_start_page |
383 |
op_container_end_page |
401 |
_version_ |
1766256455148634112 |