Consulta: subjectFacets:"40Ar/39Ar ages"
Registros recuperados: 1
Data/hora: 12/06/2024 16:18:59

40Ar/39Ar ages (600-570 Ma) of the Serra do Azeite transtensional shear zone: evidence for syncontractional extension in the Cajati area, southern Ribeira belt
Provedor de dados: 42
Autores: Machado,Rômulo; Dehler,Nolan M.; Vasconcelos,Paulo.
This paper presents 40Ar/39Ar ages of the rocks from the Serra do Azeite transtensional shear zone in the southern part of the Ribeira belt, between the States of São Paulo and Paraná, and also discusses the regional correlations and the tectonic implications for other parts of the belt. The geochronological data suggest that transtensional deformation was active between 600 and 580 Ma (hornblende and muscovite apparent ages, respectively). This time span is considerably older than previous proposals for the period of activity of these structures (520-480 Ma) in the northern segment of this belt and in the Araçuaí belt. Kinematic analysis of the dated mylonites shows extensional structures with top-down movement to ESE compatible with structures found in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Syncontractional extension; 40Ar/39Ar ages; Ribeira belt.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000400011