GEOSCAN Search Results: Fastlink


TitleProgressive environmental deterioration in northwestern Pangea leading to the latest Permian extinction
AuthorGrasby, S E; Beauchamp, B; Bond, D P G; Wignall, P; Talavera, C; Galloway, J M; Piepjohn, K; Reinhardt, L; Blomeier, D
SourceGeological Society of America Bulletin 2014 p. 1-17, (Open Access)
Alt SeriesEarth Sciences Sector, Contribution Series 20140341
PublisherGeological Society of America
Mediadigital; on-line
File formatpdf
Subjectsstratigraphy; paleontology; extinctions, biotic; fossil distribution; fossil assemblages; biostratigraphy; Kapp Starostin Formation; Paleozoic; Permian
Illustrationslocation maps; photographs; photomicrographs; plots; tables
ProgramWestern Arctic, High Arctic LIP, GEM2: Geo-mapping for Energy and Minerals
Released2015 04 14
AbstractStratigraphic records from northwestern Pangea provide unique insight into global processes that occurred during the Latest Permian Extinction (LPE). We examined a detailed geochemical record of the Festningen Section, Spitsbergen. A stepwise extinction is noted: 1) loss of carbonate shelly macrofauna, 2) loss of siliceous sponges in conjunction with an abrupt change in ichnofabrics as well as dramatic change in the terrestrial environment, and 3) final loss of all trace fossils. We interpret loss of carbonate producers as related to higher latitude shoaling of the lysocline in relationship to building atmospheric CO2. The loss of siliceous sponges is coincident the global LPE event and is related to onset of high loading rates of toxic metals (Hg, As, Co) that we suggest are derived from Siberian Trap eruptions. The final extinction stage is coincident with redox sensitive trace metal and other proxy data which suggest onset of anoxia, after the main extinction event. These results show a remarkable record of progressive environmental deterioration in NW Pangea during the extinction crises.
Summary(Plain Language Summary, not published)
This paper provides new transarctic correlation that helps to resolve the regional correlation of the Permian/Triassic boundary. These age rocks are difficult to age date using traditional paleontological methods given the scarcity of life due to the mass extinction which occurred at that time. New geochemical methods are used to resolve an outstanding controversy on correlation of time horizons from the Sverdrup Basin to known petroleum basins in the Barents Sea.