期刊
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
卷 106, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jsames.2020.103051
关键词
Fission track; (U-Th)/He; Passive margin; Thermal history modelling; Southeastern Brazil; Thermochronology
资金
- Shell Brazil through the BG05: UoA-UFRGS-SWB Sedimentary Systems project at the University of Aberdeen
- Shell Brazil through the BG05: UoA-UFRGS-SWB Sedimentary Systems project at UFRGS
- ANP through the RandD levy regulation
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq) under regime GDE of the Science Without Borders Programme [237726/2012-2]
The study utilized apatite fission track and low temperature thermochronology methods to constrain the thermo-tectonic history of the Serra do Mar escarpment in Rio de Janeiro state, Brazil. Results indicate an early cooling onset in the Barremian period and suggest samples closer to the coast exhibit more stable denudation rates.
The southeastern Brazilian passive margin records a complex post-rift evolution, with two parallel high-elevation features formed after the opening of the South Atlantic. We applied apatite fission track (AFT) and U-Th/He (AHe) low temperature thermochronology to constrain the thermo-tectonic history of the Serra do Mar escarpment in the area of Rio de Janeiro state. New AFT central ages for basement areas collected from a N-S transect orthogonal to the shoreline between the cities of Rio de Janeiro and Tres Rios, range between 98.5 +/- 5.3 and 54.1 +/- 4.2 Ma, with mean track lengths between 12.34 +/- 0.40 and 14.63 +/- 0.17 mu m. Uncorrected AHe ages lie between 68.1 +/- 5.9 and 60.2 +/- 7.3 Ma and are consistent with AFT results. Inverse thermal history models constrained by AFT and AHe data imply the earliest cooling onset from the Barremian (Early Cretaceous), with steady rates more common for samples closer to coastal areas. Maximum depths of denudation are between 2.5 and 4.5 km. Published thermochronological data from adjacent areas combined with the new results show a seemingly simpler post-rift evolution for the area, although suggesting structural control of age distribution and exhumation.
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