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TitleRecurrent Early Triassic ocean anoxia
AuthorGrasby, S EORCID logo; Beauchamp, B; Embry, A; Sanei, HORCID logo
SourceGeology vol. 41, no. 2, 2013 p. 175-178,
Alt SeriesEarth Sciences Sector, Contribution Series 20120200
PublisherGeological Society of America
Mediapaper; on-line; digital
File formatpdf
NTS39G; 49E; 49F; 49G; 49H; 59E; 59F; 59G; 59H; 340A; 340B; 340C; 340D; 560A; 560D
AreaAxel Heiberg Island; Ellesmere Island
Lat/Long WENS-98.0000 -76.0000 82.0000 79.2500
Subjectsmarine geology; geochemistry; oceanography; oceanographic surveys; Lower Triassic; Smithian; carbon; carbon isotopes; Sverdrup Basin; Mesozoic; Triassic
Illustrationslocation maps; stratigraphic columns; plots
ProgramGEM: Geo-mapping for Energy and Minerals Sverdrup Sedimentary Basin
Released2012 11 13
AbstractThe 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.

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