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Type: Artigo de periódico
Title: Recognition of Cretaceous, Paleocene, and Neogene tectonic reactivation through apatite fission-track analysis in Precambrian areas of southeast Brazil: association with the opening of the south Atlantic Ocean
Author: Saenz, CAT
Hackspacher, PC
Hadler, JC
Iunes, PJ
Guedes, S
Ribeiro, LFB
Paulo, SR
Abstract: Apatite fission-track analysis was used for the determination of thermal histories and ages in Precambrian areas of southeast Brazil. Together with geological and geomorphologic information, these ages enable us to quantify the thermal histories and timing of Mesozoic and Cenozoic epirogenic and tectonic processes. The collected samples are from different geomorphologic blocks: the high Mantiqueira mountain range (HMMR) with altitude above 1000 m, the low Mantiqueira mountain range (LMMR) under 1000 m, the Serra do Mar mountain range (SMMR), the Jundiai and Atlantic Plateaus, and the coastline, all of which have distinct thermal histories. During the Aptian (similar to120 Ma), there was an uplift of the HMMR, coincident with opening of the south Atlantic Ocean. Its thermal history indicates heating (from similar to60 to similar to80 degreesC) until the Paleocene, when rocks currently exposed in the LMMR reached temperatures of similar to100 degreesC. In this period, the Serra do Mar rift system and the Japi erosion surface were formed. The relief records the latter. During the Late Cretaceous, the SMMR was uplifted and probably linked to its origin; in the Tertiary, it experienced heating from similar to60 to similar to90 degreesC, then cooling that extends to the present. The SMMR, LMMR, and HMMR were reactivated mainly in the Paleocene, and the coastline during the Paleogene. These processes are reflected in the sedimentary sequences and discordances of the interior and continental margin basins. (C) 2002 Elsevier Science Ltd. All rights reserved.
Subject: fission-track analysis
thermal histories
southeast Brazil
Country: Inglaterra
Editor: Pergamon-elsevier Science Ltd
Rights: fechado
Date Issue: 2003
Appears in Collections:Unicamp - Artigos e Outros Documentos

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