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TitleTransient Permian-Triassic euxinia in the southern Panthalassa deep ocean
AuthorGrasby, S EORCID logo; Bond, D P G; Wignall, P B; Yin, R; Strachan, L J; Takahashi, S
SourceGeology vol. 49, no. 8, 2021 p. 889-893, Open Access logo Open Access
Alt SeriesNatural Resources Canada, Contribution Series 20210010
PublisherGeological Society of America
Mediapaper; on-line; digital
File formatpdf; html
AreaWaiheke Island; Island Bay; New Zealand
Lat/Long WENS 175.0000 175.0167 -36.7583 -36.7833
Subjectsenvironmental geology; geochemistry; paleontology; Science and Technology; Nature and Environment; paleoenvironment; paleoecology; extinctions, biotic; paleoclimates; paleogeography; trace metals; pyrite; mercury geochemistry; bedrock geology; lithology; sedimentary rocks; mudstones; cherts; biostratigraphy; fossils; microfossils; conodonts; micropaleontology; paleomagnetic interpretations; stable isotope studies; carbon isotopes; Panthalassa Ocean; Permian-Triassic Mass Extinction; Radiolarians; Kiripaka Formation; Phanerozoic; Mesozoic; Triassic; Paleozoic; Permian
Illustrationslocation maps; lithologic sections; logs; profiles; photomicrographs; plots
ProgramGEM2: Geo-mapping for Energy and Minerals Western Arctic, High Arctic LIP
Released2021 04 15
AbstractBoth the duration and severity of deep-water anoxic conditions across the Permian-Triassic mass extinction (PTME) are controversial. Panthalassa Ocean circulation models yield varying results, ranging from a well-ventilated deep ocean to rapidly developing northern-latitude, but not southern-latitude, anoxia in response to Siberian Traps-driven global warming. To address this uncertainty, we examined a southern-paleolatitude pelagic record. Trace metal and pyrite framboid data suggest bottom-water euxinic conditions developed in the southern Panthalassa Ocean at the PTME, coincident with enhanced volcanic activity indicated by Hg geochemistry. While a global ocean euxinic event at the PTME placed extraordinary stress on marine life, southern surface waters appear to have recovered more quickly as radiolarian populations returned several million years before they did in northern Panthalassa.
Summary(Plain Language Summary, not published)
This work was examining the degree of ocean anoxia caused by a Large Igneous Province eruption. To test pre-exisiting models a deep ocean record of anoxia was examined. Results show that a large CO2 release drove sevre ocean warming and anoxia, that was made worse by ocean fertilization driving an ocean algal bloom.

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