U-Pb and Sm-Nd data of the Rhyacian and Statherian Orthogneisses from Rio Piranhas-Seridó and Jaguaribeano Terranes, Borborema Province, Northeast of Brazil
The Portalegre shear zone separates the Rio Piranhas-Seridó and the Jaguaribeano geological terranes in the Northern Domain of the Borborema Province. Banded gneisses of the Caicó and the Jaguaretama Complexes represent the basements of these terranes. U-Pb analyses yielded ages of 2,193 ± 16 Ma f...
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doaj-ba337c26eaa343a8aa36468f43d77e6a2020-11-25T03:28:29ZengUniversidade de São PauloGeologia USP. Série Científica1519-874X2316-90952014-09-011439711010.5327/Z1519-874X201400030007U-Pb and Sm-Nd data of the Rhyacian and Statherian Orthogneisses from Rio Piranhas-Seridó and Jaguaribeano Terranes, Borborema Province, Northeast of BrazilJaziel Martins Sá0Laécio Cunha de Sousa1Jean Michel Legrand2Antonio Carlos Galindo3Heitor Neves Maia4Rafael Rabelo Fillippi5Departamento de Geologia, Centro de Ciências Exatas e da Terra, Universidade Federal do Rio Grande do Norte - UFRN, Natal, RN, BRDepartamento de Geologia, Centro de Ciências Exatas e da Terra, Universidade Federal do Rio Grande do Norte - UFRN, Natal, RN, BRDepartamento de Geologia, Centro de Ciências Exatas e da Terra, Universidade Federal do Rio Grande do Norte - UFRN, Natal, RN, BRDepartamento de Geologia, Centro de Ciências Exatas e da Terra, Universidade Federal do Rio Grande do Norte - UFRN, Natal, RN, BRDepartamento de Geologia, Centro de Ciências Exatas e da Terra, Universidade Federal do Rio Grande do Norte - UFRN, Natal, RN, BRPós-graduação em Geodinâmica e Geofísica, Centro de Ciências Exatas e da Terra, Universidade Federal do Rio Grande do Norte - UFRN, Natal, RN, BR The Portalegre shear zone separates the Rio Piranhas-Seridó and the Jaguaribeano geological terranes in the Northern Domain of the Borborema Province. Banded gneisses of the Caicó and the Jaguaretama Complexes represent the basements of these terranes. U-Pb analyses yielded ages of 2,193 ± 16 Ma for the Jaguaretama Complex, which is similar to those obtained for the Caicó Complex. TDM Sm-Nd ages for these basement complexes showed Neoarchean values (ca. 2.5 Ga), with εNd(t) values close to the CHUR composition. Elongated bodies were found intruding into the rocks of the Jaguaretama Complex. These foliated bodies with elongated phenocrysts are described as augen gneisses of the Serra do Deserto Suite. These gneisses yielded crystallization ages of 1,777 ± 8 Ma, confirming an extensional period during the Statherian, which is well represented in the Jaguaribeano Terrane by A-type plutonic rocks. Augen gneisses with similar textures, the so called Poço da Cruz Suite, are found intruding the Caicó Complex in the Rio Piranhas-Seridó terrane; however, the ages found throughout the domain are predominantly Rhyacian (ca. 2.2 Ga) and present calc-alkaline affinities. These findings indicate that the augen gneisses, which are widely distributed in these two terranes, have different signatures and are temporally well separated. Furthermore, in agreement with previous geophysical data suggesting a division of terranes marked by the Portalegre Shear Zone, it also demonstrates that even though the Caicó and the Jaguaretama Complexes have similar ages, similar structural evolution and metamorphism under similar pressure and temperature conditions, they exhibit marked differences in composition.http://ppegeo.igc.usp.br/pdf/guspsc/v14n3/07.pdfBorborema ProvinceJaguaribeano terraneRio Piranhas-Serido terraneSerra do Deserto SuitePoço da Cruz SuitePortalegre shear zone |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Jaziel Martins Sá Laécio Cunha de Sousa Jean Michel Legrand Antonio Carlos Galindo Heitor Neves Maia Rafael Rabelo Fillippi |
spellingShingle |
Jaziel Martins Sá Laécio Cunha de Sousa Jean Michel Legrand Antonio Carlos Galindo Heitor Neves Maia Rafael Rabelo Fillippi U-Pb and Sm-Nd data of the Rhyacian and Statherian Orthogneisses from Rio Piranhas-Seridó and Jaguaribeano Terranes, Borborema Province, Northeast of Brazil Geologia USP. Série Científica Borborema Province Jaguaribeano terrane Rio Piranhas-Serido terrane Serra do Deserto Suite Poço da Cruz Suite Portalegre shear zone |
author_facet |
Jaziel Martins Sá Laécio Cunha de Sousa Jean Michel Legrand Antonio Carlos Galindo Heitor Neves Maia Rafael Rabelo Fillippi |
author_sort |
Jaziel Martins Sá |
title |
U-Pb and Sm-Nd data of the Rhyacian and Statherian Orthogneisses from Rio Piranhas-Seridó and Jaguaribeano Terranes, Borborema Province, Northeast of Brazil |
title_short |
U-Pb and Sm-Nd data of the Rhyacian and Statherian Orthogneisses from Rio Piranhas-Seridó and Jaguaribeano Terranes, Borborema Province, Northeast of Brazil |
title_full |
U-Pb and Sm-Nd data of the Rhyacian and Statherian Orthogneisses from Rio Piranhas-Seridó and Jaguaribeano Terranes, Borborema Province, Northeast of Brazil |
title_fullStr |
U-Pb and Sm-Nd data of the Rhyacian and Statherian Orthogneisses from Rio Piranhas-Seridó and Jaguaribeano Terranes, Borborema Province, Northeast of Brazil |
title_full_unstemmed |
U-Pb and Sm-Nd data of the Rhyacian and Statherian Orthogneisses from Rio Piranhas-Seridó and Jaguaribeano Terranes, Borborema Province, Northeast of Brazil |
title_sort |
u-pb and sm-nd data of the rhyacian and statherian orthogneisses from rio piranhas-seridó and jaguaribeano terranes, borborema province, northeast of brazil |
publisher |
Universidade de São Paulo |
series |
Geologia USP. Série Científica |
issn |
1519-874X 2316-9095 |
publishDate |
2014-09-01 |
description |
The Portalegre shear zone separates the Rio Piranhas-Seridó and the Jaguaribeano geological terranes in the Northern Domain
of the Borborema Province. Banded gneisses of the Caicó and the Jaguaretama Complexes represent the basements of these
terranes. U-Pb analyses yielded ages of 2,193 ± 16 Ma for the Jaguaretama Complex, which is similar to those obtained for
the Caicó Complex. TDM Sm-Nd ages for these basement complexes showed Neoarchean values (ca. 2.5 Ga), with εNd(t)
values close to the CHUR composition. Elongated bodies were found intruding into the rocks of the Jaguaretama Complex. These
foliated bodies with elongated phenocrysts are described as augen gneisses of the Serra do Deserto Suite. These gneisses
yielded crystallization ages of 1,777 ± 8 Ma, confirming an extensional period during the Statherian, which is well represented
in the Jaguaribeano Terrane by A-type plutonic rocks. Augen gneisses with similar textures, the so called Poço da Cruz Suite,
are found intruding the Caicó Complex in the Rio Piranhas-Seridó terrane; however, the ages found throughout the domain are predominantly Rhyacian (ca. 2.2 Ga) and present calc-alkaline affinities. These findings indicate that the augen gneisses,
which are widely distributed in these two terranes, have different signatures and are temporally well separated. Furthermore,
in agreement with previous geophysical data suggesting a division of terranes marked by the Portalegre Shear Zone, it also
demonstrates that even though the Caicó and the Jaguaretama Complexes have similar ages, similar structural evolution and
metamorphism under similar pressure and temperature conditions, they exhibit marked differences in composition. |
topic |
Borborema Province Jaguaribeano terrane Rio Piranhas-Serido terrane Serra do Deserto Suite Poço da Cruz Suite Portalegre shear zone |
url |
http://ppegeo.igc.usp.br/pdf/guspsc/v14n3/07.pdf |
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