Banca de QUALIFICAÇÃO: Carlos Vinícius Alves Ribeiro

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : Carlos Vinícius Alves Ribeiro
DATE: 18/09/2023
TIME: 14:00
LOCAL: Auditório do Instituto de Geociências
TITLE:

Paleo-Mesoarchean crustal dynamics of the São José do Campestre Massif

KEY WORDS:

metamorphic, mafic, sedimentary, thermodynamics, geochronology

PAGES: 73
BIG AREA: Ciências Exatas e da Terra
AREA: Geociências
SUBÁREA: Geologia
SUMMARY:

The São José do Campestre Massif, in northeastern Brazil, represents one of the oldest crustal fragments of South America. This Archean crust was also reworked during the Mesoarchean, Paleo- and Neoproterozoic. This work focuses on supracrustal rocks aiming to constrain depositional ages, as well as the timing and conditions of the metamorphic overprints. The results of the first article indicate that these were overprinted at ca. 3.05, as well as 2.0 and 0.6 Ga. Considering the effects of multiple recrystallization events, these rocks are younger than 3.35 Ga. Similar events are also identified in the São Francisco, Kaapvaal and Dharwar Cratons, suggesting a common evolution in the Paleo-Mesoarchean. In terms of metamorphic events, preliminary modelling indicates the presence of low (>450° C) and high (>1100° C) thermobarometric ratios. If confirmed, these could be one of the oldest evidences for oceanic crust subduction and tectonic plates.

COMMITTEE MEMBERS:
Externo ao Programa - 3360919 - ALANIELSON DA CAMARA DANTAS FERREIRA - nullPresidente - 1303786 - ELTON LUIZ DANTAS
Interna - 1897668 - NATALIA HAUSER
Interno - ***.539.401-** - REINHARDT ADOLFO FUCK - UnB
Interno - 418662 - ROBERTO VENTURA SANTOS