Raft tectonics in the Kwanza Basin, Angola*
Raft tectonics (tectonique n radeaux) allows the extreme thin-skinned extension of overburden over a d6collement of thin salt or other evaporites. Rafts are allochthonous fault blocks no longer in mutual contact. In the Kwanza Basin, the type area for raft tectonics, Jurassic-Lower Cretaceous rift f...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.454.653 2023-05-15T18:21:09+02:00 Raft tectonics in the Kwanza Basin, Angola* Bernard Duval Carlos Cramez M. P. A Jackson The Pennsylvania State University CiteSeerX Archives 1991 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.454.653 http://www.beg.utexas.edu/indassoc/agl/pubs/Raft.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.454.653 http://www.beg.utexas.edu/indassoc/agl/pubs/Raft.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.beg.utexas.edu/indassoc/agl/pubs/Raft.pdf Kwanza Basin Angola salt tectonics extension tectonics raft tectonics text 1991 ftciteseerx 2016-01-08T06:06:37Z Raft tectonics (tectonique n radeaux) allows the extreme thin-skinned extension of overburden over a d6collement of thin salt or other evaporites. Rafts are allochthonous fault blocks no longer in mutual contact. In the Kwanza Basin, the type area for raft tectonics, Jurassic-Lower Cretaceous rift fill was succeeded by a cratonic Aptian Iowstand progradational wedge. At about 119 Ma, the Massive Salt capped this wedge just before the South Atlantic Ocean began opening. Active spreading caused a eustatic sea level rise and the accumulation of transgressive systems tract carbonates. About 200 km of downdip space for extension on the tilted continental margin was created, mainly by the glide of allochthonous rafts onto fresh oceanic crust. At about 110 Ma, the overburden began to extend when only a few 100 m thick, forming many small, tilted, phase 1 rafts. These older rafts were yoked together by Upper Cretaceous sedimentation before rupturing into huge, non-rotated glide blocks during phase 2 rafting from 55 to 10 Ma. Tertiary sediments accumulated asymmetrically in strike-parallel depocentres created by deep, widening grabens between phase 2 rafts. These sediments rest directly on salt or subsalt strata with a tectonic jump of 60-90 Ma. Strain rates for both phases of rafting varied from 2 × 10-16 to 3 × 10-16 s-1. Text South Atlantic Ocean Unknown |
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Open Polar |
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ftciteseerx |
language |
English |
topic |
Kwanza Basin Angola salt tectonics extension tectonics raft tectonics |
spellingShingle |
Kwanza Basin Angola salt tectonics extension tectonics raft tectonics Bernard Duval Carlos Cramez M. P. A Jackson Raft tectonics in the Kwanza Basin, Angola* |
topic_facet |
Kwanza Basin Angola salt tectonics extension tectonics raft tectonics |
description |
Raft tectonics (tectonique n radeaux) allows the extreme thin-skinned extension of overburden over a d6collement of thin salt or other evaporites. Rafts are allochthonous fault blocks no longer in mutual contact. In the Kwanza Basin, the type area for raft tectonics, Jurassic-Lower Cretaceous rift fill was succeeded by a cratonic Aptian Iowstand progradational wedge. At about 119 Ma, the Massive Salt capped this wedge just before the South Atlantic Ocean began opening. Active spreading caused a eustatic sea level rise and the accumulation of transgressive systems tract carbonates. About 200 km of downdip space for extension on the tilted continental margin was created, mainly by the glide of allochthonous rafts onto fresh oceanic crust. At about 110 Ma, the overburden began to extend when only a few 100 m thick, forming many small, tilted, phase 1 rafts. These older rafts were yoked together by Upper Cretaceous sedimentation before rupturing into huge, non-rotated glide blocks during phase 2 rafting from 55 to 10 Ma. Tertiary sediments accumulated asymmetrically in strike-parallel depocentres created by deep, widening grabens between phase 2 rafts. These sediments rest directly on salt or subsalt strata with a tectonic jump of 60-90 Ma. Strain rates for both phases of rafting varied from 2 × 10-16 to 3 × 10-16 s-1. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Bernard Duval Carlos Cramez M. P. A Jackson |
author_facet |
Bernard Duval Carlos Cramez M. P. A Jackson |
author_sort |
Bernard Duval |
title |
Raft tectonics in the Kwanza Basin, Angola* |
title_short |
Raft tectonics in the Kwanza Basin, Angola* |
title_full |
Raft tectonics in the Kwanza Basin, Angola* |
title_fullStr |
Raft tectonics in the Kwanza Basin, Angola* |
title_full_unstemmed |
Raft tectonics in the Kwanza Basin, Angola* |
title_sort |
raft tectonics in the kwanza basin, angola* |
publishDate |
1991 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.454.653 http://www.beg.utexas.edu/indassoc/agl/pubs/Raft.pdf |
genre |
South Atlantic Ocean |
genre_facet |
South Atlantic Ocean |
op_source |
http://www.beg.utexas.edu/indassoc/agl/pubs/Raft.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.454.653 http://www.beg.utexas.edu/indassoc/agl/pubs/Raft.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766200278147661824 |