Denudation history and landscape evolution of the northern East-Brazilian continental margin from apatite fission-track thermochronology

2014 ◽  
Vol 54 ◽  
pp. 158-181 ◽  
Author(s):  
A.R. Jelinek ◽  
F. Chemale ◽  
P.A. van der Beek ◽  
F. Guadagnin ◽  
J.A. Cupertino ◽  
...  
2019 ◽  
Vol 12 (4) ◽  
pp. 1670
Author(s):  
Andrea Ritter Jelinek

Este trabalho explora banco de dados traços de fissão em apatitas com o objetivo de desenvolver uma visão sinóptica de padrões de denudação através do espaço-tempo na margem continental brasileira. A resposta geomorfológica aos processos de rifteamento e ruptura continental variou ao longo da margem continental brasileira. No processo de construção do relevo desta margem foram registrados três episódios de resfriamento acelerado, que são vinculados a processos denudacionais: Cretáceo Inferior, Cretáceo Superior e Paleógeno-Neógeno. As margens continentais sudeste e leste apresentam uma morfologia de margem continental passiva característica, com as bacias sedimentares offshore separadas da região continental elevada, composta pelas Serra do Mar e da Serra da Mantiqueira, por uma planície costeira relativamente estreita. As idades de soerguimento são mais jovens do que a idade do rifteamento. O resfriamento do Paleógeno-Neógeno é resultado do aumento nas taxas de denudação, que são relacionados à formação e reativação de blocos de falha de alto ângulo que se moveram em resposta às tensões intraplaca. A região do Arco de Ponta Grossa apresenta o relevo mais jovem de toda a margem, sendo um alto topográfico associado ao magmatismo Paraná-Etendeka e limitado por zonas de cisalhamento. Duas porções da margem apresentam relevo diferenciado, com episódios de denudação pré-rifte. A Depressão Sertaneja, na margem nordeste, típica região semi-árida do nordeste caracterizada como um pediplano, com vales estreitos e vertentes dissecadas, com resfriamento do Permiano-Jurássico Inferior; e a margem sul, local com topografia baixa, e soerguimento lento e contínuo do Paleozoico.A B S T R A C TThis study explores apatite fission track database with the objective of developing a synoptic view of denudation patterns across space and time in the Brazilian continental margin. The geomorphological response to the continental rift and rupture processes varied along the Brazilian continental margin. In the construction of the relief of this margin were recorded three episodes of accelerated cooling, which are linked to denudational processes: Lower Cretaceous, Upper Cretaceous and Paleogene-Neogene episodes. The southeast and eastern continental margin presents a characteristic passive continental margin morphology, with the offshore sedimentary basins separated from the elevated continental region, Serra do Mar and Serra da Mantiqueira, for a relatively narrow coastal plain. The uplifting ages are younger than the rift age. Accelerated cooling during Paleogene-Neogene is a result of increased denudation rates, which are related to the formation and reactivation of high angle fault blocks that have moved in response to intraplate stresses. The region of the Ponta Grossa Arch presents the youngest relief of the entire continental margin. It is a high topographic associated with Paraná-Etendeka magmatism and limited by shear zones. There are two parts of the continental margin with differentiated relief, which present episodes of pre-rift denudation. The Sertaneja Depression, in the northeast margin, a typical semi-arid northeast region characterized as a pediplane, with narrow valleys and dissected slopes, where occurs a Permian-Lower Jurassic cooling episode; and the south continental margin, where the topography is relatively, registering a slow and continuous uplift during the Paleozoic. Keywords: Paleotopography, rift continental margin, apatite fission tracks


Minerals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 604
Author(s):  
Evgeny V. Vetrov ◽  
Johan De Grave ◽  
Natalia I. Vetrova ◽  
Fedor I. Zhimulev ◽  
Simon Nachtergaele ◽  
...  

The West Siberian Basin (WSB) is one of the largest intracratonic Meso-Cenozoic basins in the world. Its evolution has been studied over the recent decades; however, some fundamental questions regarding the tectonic evolution of the WSB remain unresolved or unconfirmed by analytical data. A complete understanding of the evolution of the WSB during the Mesozoic and Cenozoic eras requires insights into the cooling history of the basement rocks as determined by low-temperature thermochronometry. We presented an apatite fission track (AFT) thermochronology study on the exposed parts of the WSB basement in order to distinguish tectonic activation episodes in an absolute timeframe. AFT dating of thirteen basement samples mainly yielded Cretaceous cooling ages and mean track lengths varied between 12.8 and 14.5 μm. Thermal history modeling based on the AFT data demonstrates several Mesozoic and Cenozoic intracontinental tectonic reactivation episodes affected the WSB basement. We interpreted the episodes of tectonic activity accompanied by the WSB basement exhumation as a far-field effect from tectonic processes acting on the southern and eastern boundaries of Eurasia during the Mesozoic–Cenozoic eras.


2008 ◽  
Vol 43 (2-6) ◽  
pp. 1175
Author(s):  
J. De Grave ◽  
P. Van den haute ◽  
M.M. Buslov ◽  
B. Dehandschutter ◽  
S. Glorie

2005 ◽  
pp. 527-566 ◽  
Author(s):  
Barry P. Kohn ◽  
Andrew J.W. Gleadow ◽  
Roderick W. Brown ◽  
Kerry Gallagher ◽  
Matevz Lorencak ◽  
...  

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