| Title | Recurrent Early Triassic ocean anoxia |
| |
| Author | Grasby, S E ;
Beauchamp, B; Embry, A; Sanei, H |
| Source | Geology vol. 41, no. 2, 2013 p. 175-178, https://doi.org/10.1130/G33599.1 |
| Image |  |
| Year | 2013 |
| Alt Series | Earth Sciences Sector, Contribution Series 20120200 |
| Publisher | Geological Society of America |
| Document | serial |
| Lang. | English |
| Media | paper; on-line; digital |
| File format | pdf |
| Province | Nunavut |
| NTS | 39G; 49E; 49F; 49G; 49H; 59E; 59F; 59G; 59H; 340A; 340B; 340C; 340D; 560A; 560D |
| Area | Axel Heiberg Island; Ellesmere Island |
| Lat/Long WENS | -98.0000 -76.0000 82.0000 79.2500 |
| Subjects | marine geology; geochemistry; oceanography; oceanographic surveys; Lower Triassic; Smithian; carbon; carbon isotopes; Sverdrup Basin; Mesozoic; Triassic |
| Illustrations | location maps; stratigraphic columns; plots |
| Program | GEM:
Geo-mapping for Energy and Minerals Sverdrup Sedimentary Basin |
| Released | 2012 11 13 |
| Abstract | 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. |
| GEOSCAN ID | 291843 |
|
|