GEOSCAN Search Results: Fastlink


TitleGlobal warming leads to Early Triassic nutrient stress across northern Pangea
AuthorGrasby, S EORCID logo; Knies, J; Beauchamp, B; Bond, D P G; Wignall, P; Sun, Y
SourceGeological Society of America Bulletin vol. 132, no. 5-6, 2019 p. 943-954, Open Access logo Open Access
Alt SeriesNatural Resources Canada, Contribution Series 20180310
PublisherGeological Society of America
Mediapaper; on-line; digital
File formatpdf (Adobe® Reader®)
AreaIsfjorden; Spitsbergen; Svalbard and Jan Mayen; Norway
Lat/Long WENS 9.0000 21.0000 79.0000 77.0000
Lat/Long WENS 9.0000 21.0000 79.0000 77.0000
Subjectsenvironmental geology; geochemistry; stratigraphy; paleontology; Nature and Environment; Science and Technology; paleoclimates; paleoenvironment; extinctions, biotic; paleoecology; marine organisms; isotopic studies; isotopes; nitrogen; continental margins; oceanography; water temperature; paleogeography; stratigraphic correlations; biostratigraphy; Pangea; Panthalassa Ocean; Permian-Triassic Boundary; Latest Permian Extinction; Phanerozoic; Mesozoic; Triassic; Paleozoic; Permian
Illustrationslocation maps; geoscientific sketch maps; geochemical profiles; biostratigraphic charts
ProgramGEM2: Geo-mapping for Energy and Minerals Western Arctic, High Arctic LIP
Released2019 08 30
AbstractThe largest extinction in Earth history, in the latest Permian, was followed throughout most of the Early Triassic by a prolonged period of ecologic recovery. What factors delayed biotic recovery are still under debate and partly revolve around impacts of global warming on primary marine productivity. We examined N isotope records from the Festningen section on Spitsbergen, Arctic Norway, to examine changes in nutrient availability through the Early to Middle Triassic along the northern margin of Pangea. Our results show progressive decline in N availability throughout the Griesbachian, leading to severe nutrient limitations through the remainder of the Early Triassic, until returning to a highly productive continental margin in Middle Triassic time. These results are consistent with other studies from northern and western Pangea and thus show regional nutrient limitations occurred in what should have been the main zone of marine primary productivity. Such nutrient limitation likely stressed primary production and consequently contributed to prolonged marine recovery. We suggest this was driven by high ocean temperatures depressing the marine nutricline.
Summary(Plain Language Summary, not published)
Extreme global warming related to volcanic CO2 emissions are thought to have caused the worlds worst extinction, 252 million years ago. This event was also marked by a significantly prolonged 10 million year recovery. New work shows that this prolonged recovery was partly related to extremely high ocean temperatures that formed a deep-ocean nutrient trap that limited marine bioproductivity. Final ocean cooling led to a large nutrient flux into the shallow waters and a period of very high productivity that sequestered CO2 into geologic storage, forming what are today major petroleum source rocks across the arctic region (Alaska, Canadian Arctic Island, Barents sea). Modern combustion of this oil partly contributes to current global warming, and concerns of modern day deep-ocean nutrient traps forming.

Date modified: