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Progressive environmental deterioration in northwestern Pangea leading to the latest Permian extinction

Bond, David P. G.; Beauchamp, Benoit; Blomeier, Dierk; Galloway, Jennifer M.; Grasby, Stephen E.; Piepjohn, Karsten; Reinhardt, Lutz; Talavera, Cristina; Wignall, Paul

Authors

Benoit Beauchamp

Dierk Blomeier

Jennifer M. Galloway

Stephen E. Grasby

Karsten Piepjohn

Lutz Reinhardt

Cristina Talavera

Paul Wignall



Abstract

Stratigraphic 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 shoaling of the lysocline in relationship to building atmospheric CO2 in higher latitudes. 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 other extinction events. These results show a remarkable record of progressive environmental deterioration in NW Pangea during the extinction crises.

Publication Date 2015-09
Journal Geological Society of America bulletin
Print ISSN 0016-7606
Electronic ISSN 1943-2674
Publisher Geological Society of America
Peer Reviewed Peer Reviewed
Volume 127
Issue 9-10
Pages 1331-1347
APA6 Citation Bond, D. P. G., Beauchamp, B., Blomeier, D., Galloway, J. M., Grasby, S. E., Piepjohn, K., …Wignall, P. (2015). Progressive environmental deterioration in northwestern Pangea leading to the latest Permian extinction. Geological Society of America Bulletin, 127(9-10), 1331-1347. https://doi.org/10.1130/b31197.1
DOI https://doi.org/10.1130/b31197.1
Keywords Permian extinction, Northwestern Pangea
Publisher URL http://gsabulletin.gsapubs.org/content/early/2015/04/14/B31197.1
Additional Information Authors' accepted manuscript of article published in: Geological Society of America bulletin, 2014, v.127, no.9-10 at http://gsabulletin.gsap...rly/2015/04/14/B31197.1

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