Geochronology, geochemistry and metamorphism of the internal domain in the Riacho do Pontal fold belt

• Grant number: 14/03275-3
• Support type: Regular Research Grants
• Duration: June 01, 2014 - November 30, 2016
• Field of knowledge: Physical Sciences and Mathematics - Geosciences - Geology
• Principal researcher: Wagner da Silva Amaral
• Grantee: Wagner da Silva Amaral
• Home Institution: Instituto de Geociências (IG). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil
• Assoc. researchers: Benjamim Bley de Brito Neves ; Carolina Penteado Natividade Moreto ; Elson Paiva de Oliveira ; Evilarde Carvalho Uchôa Filho ; Fabrício de Andrade Caxito ; Felipe Holanda dos Santos ; Marcela Paschoal Perpétuo ; Thais Caroline Murer ; Ticiano José Saraiva dos Santos

Abstract

The Riacho do Pontal Belt is comprehended in the Brasiliano/Pan-African orogenic fold system developed in NE Brazil. It is located between the southwestern part of the Borborema Province and the northern limit of the São Francisco Craton. Is divided in three domains: the External Domain, which is related to a nappe system of the Casa Nova Group. The latter is composed of supracrustal rocks, mainly clastic metasedimentary; the Central Domain, which shows geophysical signatures quite similar to the Precambrian suture zones; and Internal Domain, which is cross cut by the Pernambuco Lineament in your northern limit, and is characterized by early-Tonian granitic intrusions. This last Domain is composed by the Paulistana and Santa Filomena complexes, consisting of medium-grade metamorphic rocks with a complex structural pattern. These units lack in detailed geochemical and isotopic studies, and only a few data available in the literature. In this sense, the goals of this research project include: i) the selection of areas for detail geological mapping and petrographic studies; iii) geochemical analysis of metamafic and metasedimentary rocks in terms of major, trace and rare earth elements. These analyses might help understand the petrogenetic processes involved in the genesis of these rocks and the characterization of the tectonic environments; iv) the definition of the ages of crystallization and metamorphism of the metamafic and metasedimentary sequences from the Paulistana and Santa Filomena complexes by U-Pb and Lu-Hf methods in zircon and monazite, and Sm-Nd in whole rock and mineral separates. Finally, this research aims to contribute to the understanding of the geodynamic evolution of the Riacho do Pontal Fold Belt, and comprehend the relations with the Cariris Velhos and Brasiliano / Pan-African Orogeny. (AU)

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

SANTOS, FELIPE H.; AMARAL, WAGNER S.; LUVIZOTTO, GEORGE L.; MARTINS DE SOUSA, DANIEL F.. P-T evolution of metasedimentary rocks of the Santa Filomena Complex, Riacho do Pontal Orogen, Borborema Province (NE Brazil): Geothermobarometry and metamorphic modelling. Journal of South American Earth Sciences, v. 82, p. 91-107, MAR 2018. (14/03275-3)

PITOMBEIRA, JOAO PAULO A.; AMARAL, WAGNER DA S.; DOS SANTOS, TICIANO J. S.; DANTAS, ELTON L.; FUCK, REINHARDT A.. A new record of continental arc magmatism in the Ceara Central Domain, Borborema Province (NE Brazil): evidence from the Pacatuba-Maranguape Complex. Precambrian Research, v. 359, JUL 1 2021. (14/03275-3)

SANTOS, FELIPE H.; AMARAL, WAGNER S.; UCHOA FILHO, EVILARDE C.; MARTINS, DOUGLAS T.. Detrital zircon U-Pb ages and whole-rock geochemistry of the Neoproterozoic Paulistana and Santa Filomena complexes, Borborema Province, northeastern Brazil: implications for source area composition, provenance, and tectonic setting. INTERNATIONAL GEOLOGY REVIEW, v. 59, n. 15, p. 1861-1884, 2017. (14/03275-3)