Extensional tectonics and the fragmentation of Gondwanaland
The magmatic arc of the Antarctic Peninsula displays a wide range of features related to extensional tectonics at a convergent margin. Cenozoic extensional features are concentrated in a linear belt on the western side of the peninsula. The West Coast Magnetic Anomaly (WCMA) indicates the presence o...
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Geological Society of London
1987
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Online Access: | http://nora.nerc.ac.uk/id/eprint/522686/ https://doi.org/10.1144/GSL.SP.1987.028.01.27 |
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ftnerc:oai:nora.nerc.ac.uk:522686 2023-05-15T13:45:14+02:00 Extensional tectonics and the fragmentation of Gondwanaland Dalziel, I.W.D. Grunow, A.M. Storey, B.C. Garrett, S.W. Herrod, L.D.B. Pankhurst, R.J. Coward, M.P. Dewey, J.F. Hancock, P.L. 1987 http://nora.nerc.ac.uk/id/eprint/522686/ https://doi.org/10.1144/GSL.SP.1987.028.01.27 unknown Geological Society of London Dalziel, I.W.D.; Grunow, A.M.; Storey, B.C.; Garrett, S.W.; Herrod, L.D.B.; Pankhurst, R.J. 1987 Extensional tectonics and the fragmentation of Gondwanaland. In: Coward, M.P.; Dewey, J.F.; Hancock, P.L., (eds.) Continental extensional tectonics. London, Geological Society of London, 433-441. (Special Publication, 28, 28). Publication - Book Section PeerReviewed 1987 ftnerc https://doi.org/10.1144/GSL.SP.1987.028.01.27 2023-03-10T00:02:30Z The magmatic arc of the Antarctic Peninsula displays a wide range of features related to extensional tectonics at a convergent margin. Cenozoic extensional features are concentrated in a linear belt on the western side of the peninsula. The West Coast Magnetic Anomaly (WCMA) indicates the presence of a composite batholith 90 km wide and 1 500 km long, part of which may have been emplaced during an initial splitting of the continental arc. Horst and graben structures subsequently developed in segments bounded by continental fracture zones reflecting those of the oceanic lithosphere. This suggests the influence of processes associated with the late stages of subduction. The arrival of segments of the ocean ridge at the trench may have resulted in the extension and uplift of the adjacent portion of the continental plate. The final set of these interactions began at about 7 Ma opposite the northern Antarctic Peninsula and coincided with the dramatic slowing of spreading at the surviving ocean ridge and the development of continental alkaline volcanism. Continued extension in response to the tendency of the subducted plate to continue sinking led to total failure of the continental lithosphere and the opening of Bransfield Strait, a marginal basin floored by oceanic crust. Book Part Antarc* Antarctic Antarctic Peninsula Bransfield Strait Natural Environment Research Council: NERC Open Research Archive Antarctic The Antarctic Antarctic Peninsula Bransfield Strait Geological Society, London, Special Publications 28 1 433 441 |
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Open Polar |
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Natural Environment Research Council: NERC Open Research Archive |
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ftnerc |
language |
unknown |
description |
The magmatic arc of the Antarctic Peninsula displays a wide range of features related to extensional tectonics at a convergent margin. Cenozoic extensional features are concentrated in a linear belt on the western side of the peninsula. The West Coast Magnetic Anomaly (WCMA) indicates the presence of a composite batholith 90 km wide and 1 500 km long, part of which may have been emplaced during an initial splitting of the continental arc. Horst and graben structures subsequently developed in segments bounded by continental fracture zones reflecting those of the oceanic lithosphere. This suggests the influence of processes associated with the late stages of subduction. The arrival of segments of the ocean ridge at the trench may have resulted in the extension and uplift of the adjacent portion of the continental plate. The final set of these interactions began at about 7 Ma opposite the northern Antarctic Peninsula and coincided with the dramatic slowing of spreading at the surviving ocean ridge and the development of continental alkaline volcanism. Continued extension in response to the tendency of the subducted plate to continue sinking led to total failure of the continental lithosphere and the opening of Bransfield Strait, a marginal basin floored by oceanic crust. |
author2 |
Coward, M.P. Dewey, J.F. Hancock, P.L. |
format |
Book Part |
author |
Dalziel, I.W.D. Grunow, A.M. Storey, B.C. Garrett, S.W. Herrod, L.D.B. Pankhurst, R.J. |
spellingShingle |
Dalziel, I.W.D. Grunow, A.M. Storey, B.C. Garrett, S.W. Herrod, L.D.B. Pankhurst, R.J. Extensional tectonics and the fragmentation of Gondwanaland |
author_facet |
Dalziel, I.W.D. Grunow, A.M. Storey, B.C. Garrett, S.W. Herrod, L.D.B. Pankhurst, R.J. |
author_sort |
Dalziel, I.W.D. |
title |
Extensional tectonics and the fragmentation of Gondwanaland |
title_short |
Extensional tectonics and the fragmentation of Gondwanaland |
title_full |
Extensional tectonics and the fragmentation of Gondwanaland |
title_fullStr |
Extensional tectonics and the fragmentation of Gondwanaland |
title_full_unstemmed |
Extensional tectonics and the fragmentation of Gondwanaland |
title_sort |
extensional tectonics and the fragmentation of gondwanaland |
publisher |
Geological Society of London |
publishDate |
1987 |
url |
http://nora.nerc.ac.uk/id/eprint/522686/ https://doi.org/10.1144/GSL.SP.1987.028.01.27 |
geographic |
Antarctic The Antarctic Antarctic Peninsula Bransfield Strait |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula Bransfield Strait |
genre |
Antarc* Antarctic Antarctic Peninsula Bransfield Strait |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Bransfield Strait |
op_relation |
Dalziel, I.W.D.; Grunow, A.M.; Storey, B.C.; Garrett, S.W.; Herrod, L.D.B.; Pankhurst, R.J. 1987 Extensional tectonics and the fragmentation of Gondwanaland. In: Coward, M.P.; Dewey, J.F.; Hancock, P.L., (eds.) Continental extensional tectonics. London, Geological Society of London, 433-441. (Special Publication, 28, 28). |
op_doi |
https://doi.org/10.1144/GSL.SP.1987.028.01.27 |
container_title |
Geological Society, London, Special Publications |
container_volume |
28 |
container_issue |
1 |
container_start_page |
433 |
op_container_end_page |
441 |
_version_ |
1766217616783835136 |