INVESTIGADORES
GUERESCHI Alina Beatriz
artículos
Título:
Time constraints on the tectonic evolution of the Eastern Sierras Pampeanas (Central Argentina)
Autor/es:
SIEGESMUND, S.; STEENKEN, A.; MARTINO, ROBERTO DONATO; WEMMER, K.; LÓPEZ DE LUCCHI, M.; FREI, R.; PRESNYAKOV, S.; GUERESCHI, ALINA BEATRIZ
Revista:
INTERNATIONAL JOURNAL OF EARTH SCIENCES
Editorial:
SPRINGER
Referencias:
Lugar: Berlin; Año: 2010 vol. 99 p. 1199 - 1226
ISSN:
1437-3254
Resumen:
The application of the SHRIMP U/Pb dating technique to zircon and monazite of different rock types of the Sierras de Córdoba provides an important insight into the metamorphic history of the basement domains. Additional constraints on the Pampean metamorphic episode were gained by Pb/Pb stepwise leaching (PbSL) experiments on two titanite and garnet separates. Results indicate that the metamorphic history recorded by Crd-free gneises (M2) started in the latest Neoproterozoic/earliest Cambrian (553 and 543 Ma) followed by the M4 metamorphism at ~530 Ma that is documented in the diatexites. Zircon ages of 492 Ma in the San Carlos Massif correlate partly with rather low Th/U ratios (
