Produção Nacional
Exumação tectônica e reativação de paleolineamentos no Arco de Ponta Grossa: termocronologia por traços de fissão em apatitas
2010; Sociedade Brasileira de Geologia; Volume: 40; Issue: 2 Linguagem: Inglês
10.25249/0375-7536.2010402184195
ISSN2177-4382
AutoresAna Olívia Barufi Franco-Magalhães, Peter Christian Hackspacher, Antônio Roberto Saad,
Tópico(s)Geography and Environmental Studies
ResumoThe South American Platform in southeastern Brazil is characterized by numerous dikes, shear zones, faults and fractures that seem to be reactivated at shallow crust levels, specially between Upper Cretaceous and Paleogene/Neogene, which caused block tilting and normal faulting. Apatite fission-track ages (obtained in samples collected from Paraná Basin, dikes, Precambrian basement and alkaline rocks in Ponta Grossa Arch) in association with geological evidences, allowed the cooling history reconstruction since approximately 60 Ma, in the central axis of Ponta Grossa Arch. Transtensional tectonic movements occurred between Paleogene and Neogene were the responsible for the reactivation of ancient shear zones and origin of southern portion of the Brazilian Southeastern Continental Rifts, represented in the study area by Curitiba basin, Guaraqueçaba, Sete Barras and Cananeia Grabens, and Pariquera-Açu and Alexandra formations. In the Paleogene-Neogene limit, trantensional events related to the rearrangement of South American Platform deformed the sedimentary sections in the rift basins.
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