T228 Mass Extinctions II: Past, Present, and Future?

Tuesday, 24 October 2017
1:30 PM - 5:30 PM
Room 608

THE MIDDLE PERMIAN (CAPITANIAN) EXTINCTION RECORD IN THE BOREAL REALM (SPITSBERGEN AND ELLESMERE ISLAND): EVIDENCE FOR VOLCANICALLY-DRIVEN KILL MECHANISMS

Paper number: T228-9
Program: Technical Sessions
Time: 3:30 PM – 3:45 PM

Authors

Abstract

The Middle Permian (Capitanian, ca. 262 Ma) mass extinction, mostly known from equatorial paleolatitudes, was recently identified in a Boreal (northern mid-to-high paleolatitude) setting in Spitsbergen. We document this extinction in the fossil record from Ellesmere Island (Canada), which, like Spitsbergen was situated on the NW margins of Permian Pangaea. Our data confirms Middle Permian losses as a global crisis on par with the “Big Five”. Redox proxies (pyrite framboids and trace metals) show that the high latitude crisis coincided with an intensification of oxygen-poor conditions - a potent killer, but one that is not clearly developed in lower latitude sections. Mercury, a useful proxy for large-scale volcanism, becomes briefly enriched at the level of the Middle Permian extinction level in both Spitsbergen and Ellesmere Island. This was potentially derived from the emplacement of the Emeishan large igneous province (LIP) in SW China, supporting a causal link between volcanism and extinction. Thus, a potent cocktail of poisons appears to have impacted across the Boreal Realm, whilst the near-total loss of carbonates near the extinction level is also consistent with reduced pH across the region. Multiple stresses, possibly with origins in low-latitude volcanism, are therefore implicated in the Middle Permian extinction and there was no respite even in the far-distant Boreal Realm.

Geological Society of America Abstracts with Programs. Vol. 49, No. 6

doi: 10.1130/abs/2017AM-306456

© Copyright 2017 The Geological Society of America (GSA), all rights reserved. Permission is hereby granted to the author(s) of this abstract to reproduce and distribute it freely, for noncommercial purposes. Permission is hereby granted to any individual scientist to download a single copy of this electronic file and reproduce up to 20 paper copies for noncommercial purposes advancing science and education, including classroom use, providing all reproductions include the complete content shown here, including the author information. All other forms of reproduction and/or transmittal are prohibited without written permission from GSA Copyright Permissions.