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New insights from low-temperature thermochronology into the tectonic and geomorphologic evolution of the south-eastern brazilian highlands and passive margin

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Geoscience Frontiers 2020年第1期11卷 303-324页

作者： Gerben Van Ranst Antônio Carlos Pedrosa-Soares Tiago Novo Pieter Vermeesch Johan De Grave Laboratory for Mineralogy and Petrology Department of GeologyGhent UniversityKrijgslaan 281 S89000GhentBelgium CPMTC Institute for GeosciencesFederal University of Minas GeraisAvenida Antônio Carlos 6627CEP 31270-901Belo HorizonteBrazil Department of Earth Sciences University College London5 Gower PlaceWC1E 6BSLondonUnited Kingdom

The south Atlantic passive margin along the south-eastern brazilian highlands exhibits a complex landscape,including a northern inselberg area and a southern elevated plateau,separated by the Doce River *** landscape is set on the Proterozoic to early Paleozoic rocks of the region that once was the hot core of the Aracuai orogen,in Ediacaran to Ordovician *** to the break-up of Gondwana and consequently the opening of the south Atlantic during the Early Cretaceous,those rocks of the Araquai orogen became the basement of a portion of the south Atlantic passive margin and related southeastern brazilian *** goal is to provide a new set of constraints on the thermo-tectonic history of this portion of the south-eastern brazilian margin and related surface processes,and to provide a hypothesis on the geodynamic context since *** this end,we combine the apatite fission track(AFT)and apatite(U-Th)/He(AHe)methods as input for inverse thermal history *** our AFT and AHe central ages are Late Cretaceous to early *** AFT ages vary between 62 Ma and90 Ma,with mean track lengths between 12.2μm and 13.6μ*** ages are found to be equivalent to AFT ages within uncertainty,albeit with the former exhibiting a lesser degree of *** relate this Late Cretaceous-Paleocene basement cooling to uplift with accelerated denudation at this *** variation of the denudation time can be linked to differential reactivation of the Precambrian structural network and differential erosion due to a complex interplay with the drainage *** argue that posterior large-scale sedimentation in the offshore basins may be a result of flexural isostasy combined with an expansion of the drainage *** put forward the combined compression of the Mid-Atlantic ridge and the Peruvian phase of the Andean orogeny,potentially augmented through the thermal weakening of the lower crust by the Trindade thermal anomaly,as a probable cause for th

关键词： Tectonic reactivation Differential denudation Passive margin south-eastern brazil Apatite fission tracks Apatite(UeTh)/He

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