GEOSCAN, résultats de la recherche


TitreRecurrent Early Triassic ocean anoxia
AuteurGrasby, S E; Beauchamp, B; Embry, A; Sanei, H
SourceGeology vol. 41, no. 2, 2013 p. 175-178,
Séries alt.Secteur des sciences de la Terre, Contribution externe 20120200
ÉditeurGeological Society of America
Documentpublication en série
Mediapapier; en ligne; numérique
SNRC39G; 49E; 49F; 49G; 49H; 59E; 59F; 59G; 59H; 340A; 340B; 340C; 340D; 560A; 560D
Lat/Long OENS-98.0000 -76.0000 82.0000 79.2500
Sujetsocéanographie; levés océanographiques; Trias inférieur; Smithien; carbone; isotopes de carbone; Bassin de Sverdrup ; géologie marine; géochimie; Mésozoïque; Trias
Illustrationslocation maps; stratigraphic columns; plots
ProgrammeGEM : La géocartographie de l'énergie et des minéraux, Bassin sédimentaire Sverdrup
Diffusé2012 11 13
Résumé(disponible en anglais seulement)
The Early Triassic record, from the Smithian stratotype, shows that the organic carbon isotope record from northwest Pangea closely corresponds to major fl uctuations in the inorganic carbon records from the Tethys, indicating truly global perturbations of the carbon cycle occurred during this time. Geochemical proxies for anoxia are strongly correlated with carbon isotopes, whereby negative shifts in d13Corg are associated with shifts to more anoxic to euxinic conditions, and positive shifts are related to return to more oxic conditions. Rather than by a delayed or prolonged recovery, the Early Triassic is better characterized by a series of aborted biotic recoveries related to shifts back to ocean anoxia, potentially driven by recurrent volcanism.