Phanerozoic cooling history of Archean/Paleoproterozoic basement in the southern Espinhaço Range, southeastern Brazil, through apatite fission-track analysis
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2019
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Journal of South American Earth Sciences
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Apatite fission track thermochronology of basement rocks from the southern Espinhaço Range and Quadrilátero
Ferrífero in southeastern Brazil unravels the tectonic history of this portion of the Brazilian Shield. The study
area encompasses an Archean and Paleoproterozoic granitoid-gneiss basement, in the southern border of the São
Francisco Craton, and an Archean to Paleo-Mesoproterozoic sedimentary cover. Apatite fission track ages (AFT)
vary from 187 ± 18 to 91.8 ± 7.3 Ma and horizontal confined track lengths vary from 9.62 ± 1.81 μm to
12.85 ± 1.35 μm. Thermal history modeling shows an accelerated cooling episode starting in the Upper
Devonian to Early Permian. After this event, quiescence lasted from 115 to 170 Ma. Apatite samples lack evidence
of far-field effects from rifting and opening of the South Atlantic Ocean, and also evidence from alkaline
and basaltic magmatism emplacement during Mesozoic-Cenozoic. The AFT thermochronometer remained undisturbed
during Transminas mafic dyke swarm intrusion. Finally, the last cooling event in the Espinhaço Range-
Quadrilátero Ferrífero basement records ascension to surface temperatures due to epeirogeny after new configurations
of the Nazca, South American and African plates. A climatic origin for the ascension is supported by
accentuated erosion rates, even though a weathering-prone phase is registered in weathering profiles.
Como referenciar
AMARAL-SANTOS, E.; JELINEK, A.R.; ALMEIDA-ABREU, P.A.; GENEZINI, F.A. Phanerozoic cooling history of Archean/Paleoproterozoic basement in the southern Espinhaço Range, southeastern Brazil, through apatite fission-track analysis. Journal of South American Earth Sciences, v. 96, p. 1-13, 2019. DOI: 10.1016/j.jsames.2019.102352. Disponível em: http://repositorio.ipen.br/handle/123456789/30463. Acesso em: 19 Apr 2024.
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