Timing and mechanisms for the generation and modification of the anomalous topography of the Borborema Province, northeastern Brazil.
The results of apatite fission-track analysis in 14 granitic-gneissic samples from two regional transects across the Borborema Plateau, northeastern Brazil, show evidence for two dominant paleothermal events: a Late Cretaceous cooling event beginning sometime between 100 and 90 Ma, and a second cool...
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ftunifouropreto:oai:localhost:123456789/1962 2023-05-15T17:23:00+02:00 Timing and mechanisms for the generation and modification of the anomalous topography of the Borborema Province, northeastern Brazil. Morais Neto, Jo?o Marinho de Hegarty, Kerry A. Karner, Garry David Alkmim, Fernando Flecha de 2009 application/pdf http://www.repositorio.ufop.br/handle/123456789/1962 en_US eng MORAIS NETO, J. M. de et al. Timing and mechanisms for the generation and modification of the anomalous topography of the Borborema Province, northeastern Brazil. Marine and Petroleum Geology, v. 26, n. 7, p. 1070-1086, ago. 2009. Dispon?vel em: <https://www.sciencedirect.com/science/article/pii/S0264817208001207>. Acesso em: 03 dez. 2012. 02648172 http://www.repositorio.ufop.br/handle/123456789/1962 O peri?dico Marine and Petroleum Geology concede permiss?o para dep?sito deste artigo no Reposit?rio Institucional da UFOP. N?mero da licen?a: 3315440205559. Borborema province Brazilian equatorial margin Northeastern Brazil Apatite fission-track analysis Post-rift uplift Artigo publicado em periodico 2009 ftunifouropreto 2022-03-01T15:41:55Z The results of apatite fission-track analysis in 14 granitic-gneissic samples from two regional transects across the Borborema Plateau, northeastern Brazil, show evidence for two dominant paleothermal events: a Late Cretaceous cooling event beginning sometime between 100 and 90 Ma, and a second cooling event in the Neogene. The distribution of the fission-track results suggests that the cooling events have a broad regional expression and are consistent with the geologic record in the Araripe Basin, western Borborema Province, which attests to a post-Albian uplift of the whole region. We hypothesize that the first event is due to the uplift and denudation of regional, permanent topography generated after the breakup of Brazil and Africa. Such topography is predicted by models of continental margin extension in which continental lithosphere thinning is followed by thickening of the adjacent hinterland lithosphere and crust (Kusznir, N.J., Karner, G.D., 2007. Continental lithospheric thinning and breakup in response to upwelling divergent mantle flow: application to the Woodlark, Newfoundland and Iberia margins. In: Karner, G.D., Manatschal, G., Pinheiro, L. (Eds), Imaging, mapping and modeling continental lithosphere extension and breakup. Special Publication 282, Geological Society, London, pp. 389?419.). In northeastern Brazil, this extension-engendered topography may have been amplified by magmatic underplating related to the Saint Helena and Ascension plumes. The Miocene cooling event (20?0 Ma) occurred at a time characterized by the transition from carbonate ramp to progradational clastic systems on the Pernambuco?Para?ba margin and the offshore Potiguar Basin. This same stratigraphic response characterizes the Neogene stratigraphy of many passive margins and attests to a global increase in the delivery of clastics to margins, the simplest explanation of which is a climate change that accentuated erosion of pre-existing topography. Thus, the present rugged landscape of northeastern Brazil is interpreted to be a product of this younger denudation event. A corollary of this study is that the history, distribution and delivery of clastics to the northern and northeastern margins of Brazil are a function of the regional development of the continental landscape during the Late Cenozoic. Other/Unknown Material Newfoundland RIUFOP - Repositório Institucional da UFOP (Universidade Federal de Ouro Preto) |
institution |
Open Polar |
collection |
RIUFOP - Repositório Institucional da UFOP (Universidade Federal de Ouro Preto) |
op_collection_id |
ftunifouropreto |
language |
English |
topic |
Borborema province Brazilian equatorial margin Northeastern Brazil Apatite fission-track analysis Post-rift uplift |
spellingShingle |
Borborema province Brazilian equatorial margin Northeastern Brazil Apatite fission-track analysis Post-rift uplift Morais Neto, Jo?o Marinho de Hegarty, Kerry A. Karner, Garry David Alkmim, Fernando Flecha de Timing and mechanisms for the generation and modification of the anomalous topography of the Borborema Province, northeastern Brazil. |
topic_facet |
Borborema province Brazilian equatorial margin Northeastern Brazil Apatite fission-track analysis Post-rift uplift |
description |
The results of apatite fission-track analysis in 14 granitic-gneissic samples from two regional transects across the Borborema Plateau, northeastern Brazil, show evidence for two dominant paleothermal events: a Late Cretaceous cooling event beginning sometime between 100 and 90 Ma, and a second cooling event in the Neogene. The distribution of the fission-track results suggests that the cooling events have a broad regional expression and are consistent with the geologic record in the Araripe Basin, western Borborema Province, which attests to a post-Albian uplift of the whole region. We hypothesize that the first event is due to the uplift and denudation of regional, permanent topography generated after the breakup of Brazil and Africa. Such topography is predicted by models of continental margin extension in which continental lithosphere thinning is followed by thickening of the adjacent hinterland lithosphere and crust (Kusznir, N.J., Karner, G.D., 2007. Continental lithospheric thinning and breakup in response to upwelling divergent mantle flow: application to the Woodlark, Newfoundland and Iberia margins. In: Karner, G.D., Manatschal, G., Pinheiro, L. (Eds), Imaging, mapping and modeling continental lithosphere extension and breakup. Special Publication 282, Geological Society, London, pp. 389?419.). In northeastern Brazil, this extension-engendered topography may have been amplified by magmatic underplating related to the Saint Helena and Ascension plumes. The Miocene cooling event (20?0 Ma) occurred at a time characterized by the transition from carbonate ramp to progradational clastic systems on the Pernambuco?Para?ba margin and the offshore Potiguar Basin. This same stratigraphic response characterizes the Neogene stratigraphy of many passive margins and attests to a global increase in the delivery of clastics to margins, the simplest explanation of which is a climate change that accentuated erosion of pre-existing topography. Thus, the present rugged landscape of northeastern Brazil is interpreted to be a product of this younger denudation event. A corollary of this study is that the history, distribution and delivery of clastics to the northern and northeastern margins of Brazil are a function of the regional development of the continental landscape during the Late Cenozoic. |
format |
Other/Unknown Material |
author |
Morais Neto, Jo?o Marinho de Hegarty, Kerry A. Karner, Garry David Alkmim, Fernando Flecha de |
author_facet |
Morais Neto, Jo?o Marinho de Hegarty, Kerry A. Karner, Garry David Alkmim, Fernando Flecha de |
author_sort |
Morais Neto, Jo?o Marinho de |
title |
Timing and mechanisms for the generation and modification of the anomalous topography of the Borborema Province, northeastern Brazil. |
title_short |
Timing and mechanisms for the generation and modification of the anomalous topography of the Borborema Province, northeastern Brazil. |
title_full |
Timing and mechanisms for the generation and modification of the anomalous topography of the Borborema Province, northeastern Brazil. |
title_fullStr |
Timing and mechanisms for the generation and modification of the anomalous topography of the Borborema Province, northeastern Brazil. |
title_full_unstemmed |
Timing and mechanisms for the generation and modification of the anomalous topography of the Borborema Province, northeastern Brazil. |
title_sort |
timing and mechanisms for the generation and modification of the anomalous topography of the borborema province, northeastern brazil. |
publishDate |
2009 |
url |
http://www.repositorio.ufop.br/handle/123456789/1962 |
genre |
Newfoundland |
genre_facet |
Newfoundland |
op_relation |
MORAIS NETO, J. M. de et al. Timing and mechanisms for the generation and modification of the anomalous topography of the Borborema Province, northeastern Brazil. Marine and Petroleum Geology, v. 26, n. 7, p. 1070-1086, ago. 2009. Dispon?vel em: <https://www.sciencedirect.com/science/article/pii/S0264817208001207>. Acesso em: 03 dez. 2012. 02648172 http://www.repositorio.ufop.br/handle/123456789/1962 |
op_rights |
O peri?dico Marine and Petroleum Geology concede permiss?o para dep?sito deste artigo no Reposit?rio Institucional da UFOP. N?mero da licen?a: 3315440205559. |
_version_ |
1766109985589166080 |