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TitleAn abrupt extinction in the Middle Permian (Capitanian) of the Boreal Realm (Spitsbergen) and its link to anoxia and acidification
AuthorBond, D P G; Wignall, P B; Joachimski, M M; Sun, Y; Savov, I; Grasby, S E; Beauchamp, B; Blomeier, D P G
SourceGeological Society of America Bulletin 2015 p. 1-12, (Open Access)
Alt SeriesEarth Sciences Sector, Contribution Series 20140490
PublisherGeological Society of America
Mediapaper; on-line; digital
File formatpdf
AreaSvalbard; Norway
Lat/Long WENS 13.5000 15.0000 78.2500 77.5000
Subjectspaleontology; extinctions, biotic; isotopes; isotope ratios; strontium strontium ratios; stratigraphic correlations; Brachiopods; Kapp Starostin Formation; Capitanian; Paleozoic; Permian
Illustrationslocation maps; stratigraphic columns; photographs; tables
ProgramWestern Arctic Sverdrup Basin, GEM2: Geo-mapping for Energy and Minerals
Released2015 04 14
AbstractThe controversial Capitanian (Middle Permian, 262 Ma) extinction event is only known from equatorial latitudes, and consequently its global extent is poorly resolved. We demonstrate that there were two, severe extinctions amongst brachiopods in northern Boreal latitudes (Spitsbergen) in the Middle to Late Permian, separated by a recovery phase. New age dating of the Spitsbergen strata (belonging to the Kapp Starostin Formation), using strontium isotopes and d13C trends and comparison with better-dated sections in Greenland, suggests that the first crisis occurred in the Capitanian. This age assignment indicates that this Middle Permian extinction is manifested at higher latitudes. Redox proxies (pyrite framboids and trace metals) show that the Boreal crisis coincided with an intensification of oxygen depletion, implicating anoxia in the extinction scenario. The widespread and near-total loss of carbonates across the Boreal Realm also suggests a role for acidification in the crisis. The recovery interval saw the appearance of new brachiopod and bivalve taxa alongside survivors, and an increased mollusk dominance, resulting in an assemblage reminiscent of younger Mesozoic assemblages. The subsequent end-Permian mass extinction terminated this Late Permian radiation.
Summary(Plain Language Summary, not published)
New tools are used to establish global age correlation of sedimentary rocks in the High Arctic with those from south China. This allows more definitive age assignment of rocks that in the past has been hampered by lack of age diagnostic fossils. These results support effort for transarctic correlation and mapping of potential petroleum bearing rocks.