INVESTIGADORES
PERALTA Silvio Heriberto
congresos y reuniones científicas
Título:
SPICE-SNICE Couplet in one same section, Precordillera of Argentina: C and Sr-isotope Stratigraphies
Autor/es:
FERREIRA, V.; SIAL, A.; PERALTA, S H; GAUCHER, C.; TOSELLI, A.J.; PARADA, M.A.; PIMENTEL, M.M.
Lugar:
Brazil
Reunión:
Conferencia; Goldschmidt Conference; 2009
Institución organizadora:
IGc Instituto de Geociências - USP, CPGeo Centro de Pesquisas Geocronológicas
Resumen:
A large and global positive excursion of d13C (~+5) for the Steptoean stage, Upper Cambrian (SPICE) carbonates represents a major perturbation of the Cambrian carbon cycle at ~500Ma. In contrast, C-isotope variation curves for the Cambrian-Ordovician boundary in Australia and United States reveal a pronounced negative C-isotope excursion (-4) in the uppermost Cambrian (Sunwaptan stage). Both anomalies have been recognized in carbonates of the Precordillera, western Argentina: SPICE in the La Flecha Formation, Quebrada de La Angostura, and the negative anomaly (SNICE, acronym for Sunwaptan negative isotope carbon excursion [1]) in the La Flecha Formation, Quebrada de La Flecha.
