Burial, uplift and exhumation history of the Atlantic margin of NE Brazil.
International audience We have undertaken a regional study of landscape development and thermo-tectonic evo-lution of NE Brazil. Our results reveal a long history of post-Devonian burial and exhuma-tion across NE Brazil. Uplift movements just prior to and during Early Cretaceous rifting led to furth...
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ftinsu:oai:HAL:insu-00573147v1 2023-06-18T03:40:58+02:00 Burial, uplift and exhumation history of the Atlantic margin of NE Brazil. Japsen, Peter Bonow, Johan-M. Green, Paul-F. Cobbold, P.R. Chiossi, Dario Lilletveit, Ragnhild Géosciences Rennes (GR) Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre Armoricain de Recherches en Environnement-Centre National de la Recherche Scientifique (CNRS) Vienne, Austria 2010-05-02 https://hal-insu.archives-ouvertes.fr/insu-00573147 en eng HAL CCSD insu-00573147 https://hal-insu.archives-ouvertes.fr/insu-00573147 Geophysical Research Abstracts European geosciences Union General Assembly https://hal-insu.archives-ouvertes.fr/insu-00573147 European geosciences Union General Assembly, May 2010, Vienne, Austria. pp.EGU2010-4480 [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/conferenceObject Conference papers 2010 ftinsu 2023-06-05T19:09:05Z International audience We have undertaken a regional study of landscape development and thermo-tectonic evo-lution of NE Brazil. Our results reveal a long history of post-Devonian burial and exhuma-tion across NE Brazil. Uplift movements just prior to and during Early Cretaceous rifting led to further regional denudation, to filling of rift basins and finally to formation of the Atlantic margin. The rifted margin was buried by a km-thick post-rift section, but exhumation began in the Late Cretaceous as a result of plate-scale forces. The Cretaceous cover probably extended over much of NE Brazil where it is still preserved over extensive areas. The Late Cretaceous exhumation event was followed by events in the Paleogene and Neogene. The results of these events of uplift and exhumation are two regional peneplains that form steps in the landscape. The plateaux in the interior highlands are defined by the Higher Surface at c. 1 km above sea level. This surface formed by fluvial erosion after the Late Cretaceous event - and most likely after the Paleogene event and thus formed as a Paleogene pene-plain near sea level. This surface was reburied prior to the Neogene event, in the interior by continental deposits and along the Atlantic margin by marine and coastal deposits. Neo-gene uplift led to reexposure of the Palaeogene peneplain and to formation of the Lower Surface by incision along rivers below the uplifted Higher Surface that characterise the pre-sent landscape. Our results show that the elevated landscapes along the Brazilian margin formed during the Neogene, c. 100 Myr after break-up. Studies in West Greenland have demonstrated that similar landscapes formed during the late Neogene, c. 50 Myr after break-up. Many passive continental margins around the world are characterised by such elevated plateaus and it thus seems possible, even likely, that they may also post-date rifting and continental separation by many Myr. Conference Object Greenland Institut national des sciences de l'Univers: HAL-INSU Greenland |
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Institut national des sciences de l'Univers: HAL-INSU |
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ftinsu |
language |
English |
topic |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
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[SDU.STU]Sciences of the Universe [physics]/Earth Sciences Japsen, Peter Bonow, Johan-M. Green, Paul-F. Cobbold, P.R. Chiossi, Dario Lilletveit, Ragnhild Burial, uplift and exhumation history of the Atlantic margin of NE Brazil. |
topic_facet |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience We have undertaken a regional study of landscape development and thermo-tectonic evo-lution of NE Brazil. Our results reveal a long history of post-Devonian burial and exhuma-tion across NE Brazil. Uplift movements just prior to and during Early Cretaceous rifting led to further regional denudation, to filling of rift basins and finally to formation of the Atlantic margin. The rifted margin was buried by a km-thick post-rift section, but exhumation began in the Late Cretaceous as a result of plate-scale forces. The Cretaceous cover probably extended over much of NE Brazil where it is still preserved over extensive areas. The Late Cretaceous exhumation event was followed by events in the Paleogene and Neogene. The results of these events of uplift and exhumation are two regional peneplains that form steps in the landscape. The plateaux in the interior highlands are defined by the Higher Surface at c. 1 km above sea level. This surface formed by fluvial erosion after the Late Cretaceous event - and most likely after the Paleogene event and thus formed as a Paleogene pene-plain near sea level. This surface was reburied prior to the Neogene event, in the interior by continental deposits and along the Atlantic margin by marine and coastal deposits. Neo-gene uplift led to reexposure of the Palaeogene peneplain and to formation of the Lower Surface by incision along rivers below the uplifted Higher Surface that characterise the pre-sent landscape. Our results show that the elevated landscapes along the Brazilian margin formed during the Neogene, c. 100 Myr after break-up. Studies in West Greenland have demonstrated that similar landscapes formed during the late Neogene, c. 50 Myr after break-up. Many passive continental margins around the world are characterised by such elevated plateaus and it thus seems possible, even likely, that they may also post-date rifting and continental separation by many Myr. |
author2 |
Géosciences Rennes (GR) Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre Armoricain de Recherches en Environnement-Centre National de la Recherche Scientifique (CNRS) |
format |
Conference Object |
author |
Japsen, Peter Bonow, Johan-M. Green, Paul-F. Cobbold, P.R. Chiossi, Dario Lilletveit, Ragnhild |
author_facet |
Japsen, Peter Bonow, Johan-M. Green, Paul-F. Cobbold, P.R. Chiossi, Dario Lilletveit, Ragnhild |
author_sort |
Japsen, Peter |
title |
Burial, uplift and exhumation history of the Atlantic margin of NE Brazil. |
title_short |
Burial, uplift and exhumation history of the Atlantic margin of NE Brazil. |
title_full |
Burial, uplift and exhumation history of the Atlantic margin of NE Brazil. |
title_fullStr |
Burial, uplift and exhumation history of the Atlantic margin of NE Brazil. |
title_full_unstemmed |
Burial, uplift and exhumation history of the Atlantic margin of NE Brazil. |
title_sort |
burial, uplift and exhumation history of the atlantic margin of ne brazil. |
publisher |
HAL CCSD |
publishDate |
2010 |
url |
https://hal-insu.archives-ouvertes.fr/insu-00573147 |
op_coverage |
Vienne, Austria |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland |
genre_facet |
Greenland |
op_source |
Geophysical Research Abstracts European geosciences Union General Assembly https://hal-insu.archives-ouvertes.fr/insu-00573147 European geosciences Union General Assembly, May 2010, Vienne, Austria. pp.EGU2010-4480 |
op_relation |
insu-00573147 https://hal-insu.archives-ouvertes.fr/insu-00573147 |
_version_ |
1769006337735262208 |