Long-term landscape evolution and post-rift reactivation in the southeastern Brazilian passive continental margin: Taubaté basin

Zircon (ZFT) and apatite (AFT) fission-track low-temperature thermochronology was applied at the Brazilian passive continental margin in order to understand and reconstruct the post-rift evolution since the breakup of southwestern Gondwana. The thermochronological data obtained from samples of both...

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Bibliographic Details
Published in:International journal of earth sciences : Geologische Rundschau 2014-03, Vol.103 (2), p.441-453
Main Authors: Franco-Magalhaes, A. O. B., Cuglieri, M. A. A., Hackspacher, P. C., Saad, A. R.
Format: Article
Language:English
Subjects:
Continental margins
Cretaceous
Earth and Environmental Science
Earth Sciences
Evolution
Geochemistry
Geological time
Geology
Geophysics
Geophysics/Geodesy
Low temperature
Mineral Resources
Neogene
Original Paper
Paleogene
Plate tectonics
Precambrian
Sedimentary rocks
Sedimentology
Seismology
Structural Geology
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Summary:Zircon (ZFT) and apatite (AFT) fission-track low-temperature thermochronology was applied at the Brazilian passive continental margin in order to understand and reconstruct the post-rift evolution since the breakup of southwestern Gondwana. The thermochronological data obtained from samples of both the Precambrian basement and the Paleogene to Neogene sedimentary rocks from the continental rift of southeastern Brazil provided ZFT ages between 148 (15) and 64 (6) Ma, and AFT ages of 81 (8)–29 (3) Ma. These data clearly indicate syn- and post-rift reactivations during the Early Cretaceous, with great emphasis on Paleogene to Neogene times. Integrating the results of older thermochronological studies, the reactivation of the southeastern Brazilian margin can be described in three main phases related to the rift to post-rift evolution of SE Brazil. In general, ZFT and AFT data yield spread values that become younger as samples are closer to the reactivated Neoproterozoic shear zones and might reflect source area exhumation. The analysis of ZFT and AFT data allowed interpretations regarding the main phases that occurred in the study area related to the thermotectonic and tectono-stratigraphic evolution in southeastern Brazil.
ISSN:1437-3254
1437-3262
DOI:10.1007/s00531-013-0967-4