Deformational evolution of a Cretaceous subduction complex: Elephant Island, South Shetland Islands, Antarctica
New structural data from Elephant Island and adjacent islands are presented with the objective to improve the understanding of subduction kinematics in the area northeast of the Antarctic Peninsula. on the island, a first deformation phase, D-1, produced a strong SL fabric with steep stretching and...
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Elsevier B.V.
2014
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Online Access: | http://acervodigital.unesp.br/handle/11449/25154 http://hdl.handle.net/11449/25154 https://doi.org/10.1016/S0040-1951(00)00021-4 |
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ftunivesp:oai:acervodigital.unesp.br:11449/25154 2023-05-15T14:03:31+02:00 Deformational evolution of a Cretaceous subduction complex: Elephant Island, South Shetland Islands, Antarctica Trouw, RAJ Passchier, C. W. Valeriano, C. M. Simoes, LSA Paciullo, FVP Ribeiro, A. Universidade Estadual Paulista (UNESP) 2014-05-20T14:17:11Z http://acervodigital.unesp.br/handle/11449/25154 http://hdl.handle.net/11449/25154 https://doi.org/10.1016/S0040-1951(00)00021-4 eng eng Elsevier B.V. Tectonophysics Tectonophysics. Amsterdam: Elsevier B.V., v. 319, n. 2, p. 93-110, 2000. 0040-1951 http://hdl.handle.net/11449/25154 http://acervodigital.unesp.br/handle/11449/25154 doi:10.1016/S0040-1951(00)00021-4 WOS:000086401400002 http://dx.doi.org/10.1016/S0040-1951(00)00021-4 info:eu-repo/semantics/closedAccess accretionary wedge oblique subduction polyphase deformation South Shetland Islands subduction complex outro 2014 ftunivesp https://doi.org/10.1016/S0040-1951(00)00021-4 2021-07-18T08:30:11Z New structural data from Elephant Island and adjacent islands are presented with the objective to improve the understanding of subduction kinematics in the area northeast of the Antarctic Peninsula. on the island, a first deformation phase, D-1, produced a strong SL fabric with steep stretching and mineral lineations, partly defined by relatively high pressure minerals, such as crossite and glaucophane. D-1 is interpreted to record southward subduction along an E-W trench with respect to the present position of the island. A second phase, D-2, led to intense folding with steep E-W-trending axial surfaces. The local presence of sinistral C'-type sheer bands related to this phase and the oblique inclination of the L-2 stretching lineations are the main arguments to interpret this phase as representing oblique sinistral transpressive shear along steep, approximately E-W-trending shear zones, with the northern (Pacific) block going down with respect to the southern (Antarctic Peninsula) block. The sinistral strike-slip component may represent a trench-linked strike-slip movement as a consequence of oblique subduction. Lithostatic pressure decreased and temperature increased to peak values during D-2, interpreted to represent the collision of thickened oceanic crust with the active continental margin. The last deformation phase, D-3, is characterised by post-metamorphic kink bands, partially forming conjugate sets consistent with E-W shortening and N-S extension. The rock units that underlie the island probably rotated during D-3, in Cenozoic times, together with the trench, from an NE-SW to the present ENE-WSW position, during the progressive opening of the Scotia Sea. The similarity between the strain orientation of D-3 and that of the sinistral NE-SW Shackleton Fracture Zone is consistent with this interpretation. (C) 2000 Elsevier B.V. B.V. All rights reserved. Other/Unknown Material Antarc* Antarctic Antarctic Peninsula Antarctica Elephant Island Scotia Sea South Shetland Islands Universidade Estadual Paulista São Paulo: Acervo Digital da UNESP / São Paulo State University Antarctic Antarctic Peninsula Elephant Island ENVELOPE(-55.184,-55.184,-61.085,-61.085) Pacific Scotia Sea Shackleton Shackleton Fracture Zone ENVELOPE(-60.000,-60.000,-60.000,-60.000) South Shetland Islands The Antarctic Tectonophysics 319 2 93 110 |
institution |
Open Polar |
collection |
Universidade Estadual Paulista São Paulo: Acervo Digital da UNESP / São Paulo State University |
op_collection_id |
ftunivesp |
language |
English |
topic |
accretionary wedge oblique subduction polyphase deformation South Shetland Islands subduction complex |
spellingShingle |
accretionary wedge oblique subduction polyphase deformation South Shetland Islands subduction complex Trouw, RAJ Passchier, C. W. Valeriano, C. M. Simoes, LSA Paciullo, FVP Ribeiro, A. Deformational evolution of a Cretaceous subduction complex: Elephant Island, South Shetland Islands, Antarctica |
topic_facet |
accretionary wedge oblique subduction polyphase deformation South Shetland Islands subduction complex |
description |
New structural data from Elephant Island and adjacent islands are presented with the objective to improve the understanding of subduction kinematics in the area northeast of the Antarctic Peninsula. on the island, a first deformation phase, D-1, produced a strong SL fabric with steep stretching and mineral lineations, partly defined by relatively high pressure minerals, such as crossite and glaucophane. D-1 is interpreted to record southward subduction along an E-W trench with respect to the present position of the island. A second phase, D-2, led to intense folding with steep E-W-trending axial surfaces. The local presence of sinistral C'-type sheer bands related to this phase and the oblique inclination of the L-2 stretching lineations are the main arguments to interpret this phase as representing oblique sinistral transpressive shear along steep, approximately E-W-trending shear zones, with the northern (Pacific) block going down with respect to the southern (Antarctic Peninsula) block. The sinistral strike-slip component may represent a trench-linked strike-slip movement as a consequence of oblique subduction. Lithostatic pressure decreased and temperature increased to peak values during D-2, interpreted to represent the collision of thickened oceanic crust with the active continental margin. The last deformation phase, D-3, is characterised by post-metamorphic kink bands, partially forming conjugate sets consistent with E-W shortening and N-S extension. The rock units that underlie the island probably rotated during D-3, in Cenozoic times, together with the trench, from an NE-SW to the present ENE-WSW position, during the progressive opening of the Scotia Sea. The similarity between the strain orientation of D-3 and that of the sinistral NE-SW Shackleton Fracture Zone is consistent with this interpretation. (C) 2000 Elsevier B.V. B.V. All rights reserved. |
author2 |
Universidade Estadual Paulista (UNESP) |
format |
Other/Unknown Material |
author |
Trouw, RAJ Passchier, C. W. Valeriano, C. M. Simoes, LSA Paciullo, FVP Ribeiro, A. |
author_facet |
Trouw, RAJ Passchier, C. W. Valeriano, C. M. Simoes, LSA Paciullo, FVP Ribeiro, A. |
author_sort |
Trouw, RAJ |
title |
Deformational evolution of a Cretaceous subduction complex: Elephant Island, South Shetland Islands, Antarctica |
title_short |
Deformational evolution of a Cretaceous subduction complex: Elephant Island, South Shetland Islands, Antarctica |
title_full |
Deformational evolution of a Cretaceous subduction complex: Elephant Island, South Shetland Islands, Antarctica |
title_fullStr |
Deformational evolution of a Cretaceous subduction complex: Elephant Island, South Shetland Islands, Antarctica |
title_full_unstemmed |
Deformational evolution of a Cretaceous subduction complex: Elephant Island, South Shetland Islands, Antarctica |
title_sort |
deformational evolution of a cretaceous subduction complex: elephant island, south shetland islands, antarctica |
publisher |
Elsevier B.V. |
publishDate |
2014 |
url |
http://acervodigital.unesp.br/handle/11449/25154 http://hdl.handle.net/11449/25154 https://doi.org/10.1016/S0040-1951(00)00021-4 |
long_lat |
ENVELOPE(-55.184,-55.184,-61.085,-61.085) ENVELOPE(-60.000,-60.000,-60.000,-60.000) |
geographic |
Antarctic Antarctic Peninsula Elephant Island Pacific Scotia Sea Shackleton Shackleton Fracture Zone South Shetland Islands The Antarctic |
geographic_facet |
Antarctic Antarctic Peninsula Elephant Island Pacific Scotia Sea Shackleton Shackleton Fracture Zone South Shetland Islands The Antarctic |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica Elephant Island Scotia Sea South Shetland Islands |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica Elephant Island Scotia Sea South Shetland Islands |
op_relation |
Tectonophysics Tectonophysics. Amsterdam: Elsevier B.V., v. 319, n. 2, p. 93-110, 2000. 0040-1951 http://hdl.handle.net/11449/25154 http://acervodigital.unesp.br/handle/11449/25154 doi:10.1016/S0040-1951(00)00021-4 WOS:000086401400002 http://dx.doi.org/10.1016/S0040-1951(00)00021-4 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1016/S0040-1951(00)00021-4 |
container_title |
Tectonophysics |
container_volume |
319 |
container_issue |
2 |
container_start_page |
93 |
op_container_end_page |
110 |
_version_ |
1766274200325062656 |