Geological evolution of the são Roque domain: a contribution from geochronology of the granitic magmatism and provenance of psammitic metasediments

• Grant number: 12/04148-0
• Support Opportunities: Regular Research Grants
• Duration: June 01, 2012 - May 31, 2014
• Field of knowledge: Physical Sciences and Mathematics - Geosciences - Geology
• Principal Investigator: Valdecir de Assis Janasi
• Grantee: Valdecir de Assis Janasi
• Host Institution: Instituto de Geociências (IGC). Universidade de São Paulo (USP). São Paulo , SP, Brazil
• Associated researchers: Colombo Celso Gaeta Tassinari ; Miguel Angelo Stipp Basei

Abstract

This project takes advantage of the availability of new techniques of in situ dating of zircon to offer a contribution to the geological evolution of the São Roque Domain, an important tectonic unit in southeast Brazil, located at the interface between the Mantiqueira and Tocantins Provinces, and whose age and geologic significance are still controversial. Mostly using material obtained by the proponents in their previous studies in the area, granitic plutons will be dated by Shrimp or LA-MC-ICPMS, aiming at the precise determination of the age and chronostratigraphy of the neoproterozoic granitic magmatism. Moreover, by dating inherited cores, it will be possible to evaluate the age and characteristics of the sources that generated this magmatism. In parallel, provenance studies of metapsammites (quartzites, metarenites anda metarkoses) will be perfomed, dating detrital zircon crystals; in such a way, upper limits for depositional ages of the sediments will be defined, as well as the possible existence of distinct metassedimentary sequences within the São Roque Domain will be evatuated. The provenance results will be integrated with previously obtained Sm-Nd isotope data in metapelites and metaconglomerates from the São Roque Domain (unpublished results from the proponents). (AU)

Scientific publications

(4)

(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)

HENRIQUE-PINTO, R.; JANASI, V. A.; VASCONCELLOS, A. C. B. C.; SAWYER, E. W.; BARNES, S. -J.; BASEI, M. A. S.; TASSINARI, C. C. G.. Zircon provenance in meta-sandstones of the Sao Roque Domain: Implications for the Proterozoic evolution of the Ribeira Belt, SE Brazil. Precambrian Research, v. 256, p. 271-288, JAN 2015. (12/04148-0)

HENRIQUE-PINTO, RENATO; JANASI, VALDECIR DE ASSIS; CARVALHO, BRUNA BORGES; CALADO, BRUNO DE OLIVEIRA; GROHMANN, CARLOS HENRIQUE. Integrated geological map of the Sao Roque Domain, North of Sao Paulo City - Brazil. Journal of Maps, v. 10, n. 3, p. 434-439, JUL 3 2014. (12/04148-0)

JANASI, VALDECIR DE ASSIS; ANDRADE, SANDRA; VASCONCELLOS, ANTONIO CARLOS B. C.; HENRIQUE-PINTO, RENATO; ULBRICH, HORSTPETER H. G. J.. Timing and sources of granite magmatism in the Ribeira Belt, SE Brazil: Insights from zircon in situ U-Pb dating and Hf isotope geochemistry in granites from the Sao Roque Domain. Journal of South American Earth Sciences, v. 68, n. SI, p. 224-247, JUL 2016. (12/04148-0)

HENRIQUE-PINTO, R.; JANASI, V. A.; TASSINARI, C. C. G.; CARVALHO, B. B.; CIOFFI, C. R.; STRIKIS, N. M.. Provenance and sedimentary environments of the Proterozoic Sao Roque Group, SE-Brazil: Contributions from petrography, geochemistry and Sm-Nd isotopic systematics of metasedimentary rocks. Journal of South American Earth Sciences, v. 63, p. 191-207, NOV 2015. (12/04148-0)