A carbon‐isotopic study of an end‐Permian mass‐extinction horizon,Bulla, northern Italy: a negative δ13C shift prior to the marine extinction |
| |
| Authors: | P Gorjan K Kaiho Z Q Chen |
| |
| Institution: | 1. Institute of Geology & Paleontology, Tohoku University, Sendai 980‐8578, Japan;2. School of Earth & Geographical Sciences, University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia |
| |
| Abstract: | Palaeontological data from the Permian‐Triassic Bulla section, northern Italy, demonstrate a rapid extinction at this site. This occurs after a negative carbonate carbon‐isotope (δ13Ccarb) shift, consistent with two other northern Italian sites (Val Badia and Tesero). However, conclusion goes against recent reporting that the extinction occurs before the δ13Ccarb shift. We agree that the shift occurs after the extinction at Jameson Land, east Greenland (a high latitude palaeolocation). However, all other sections show the shift before, or coincident with, the extinction. We suggest that the simplest explanation is a coeval shift in carbonate carbon‐isotope shifts, and it follows that the extinction was not. This suggests that the end‐Permian extinction crept from region to region. It also suggests that the marine extinction occurred first in high northern latitudes. |
| |
| Keywords: | |
|
|
