Mass extinctions, climatic and oceanographic changes at the Devonian/Carboniferous boundary
- A positive carbon isotope excursion is reported for the global Hangenberg Event at the Devonian/Carboniferous boundary, revealed by a correlation of Austrian, Italian, French and German sections using high-resolution conodont biostratigraphy. The \(\delta^{13}C_{carb,org}\) excursions indicate global change in the isotopic composition of marine dissolved \(HCO_{3}\)- and atmospheric \(CO_{2}\), which resulted from the increased burial of organic matter by globally widespread black shale deposition during high seawater temperatures, as indicated by \(\delta^{18}O_{phosph}\) of conodonts. Low temperatures are recorded in beds overlying the regressive event phase, correlated previously with a glacial episode in Gondwana. Glacially induced sea-level changes were testified by a correlation of Moroccan siliciclastic beds using litho- and ammonoid stratigraphy. The data support the hypothesis that increased \(C_{org}\) burial and oceanic anoxia triggered glaciations, eustatic sea-level changes and mass extinctions at the D/C boundary.
Author: | Sandra Isabella KaiserGND |
---|---|
URN: | urn:nbn:de:hbz:294-14263 |
Referee: | Thomas SteuberGND |
Document Type: | Doctoral Thesis |
Language: | English |
Date of Publication (online): | 2005/08/30 |
Date of first Publication: | 2005/08/30 |
Publishing Institution: | Ruhr-Universität Bochum, Universitätsbibliothek |
Granting Institution: | Ruhr-Universität Bochum, Fakultät für Geowissenschaften |
Date of final exam: | 2005/05/10 |
Creating Corporation: | Fakultät für Geowissenschaften |
GND-Keyword: | Devon-Karbon-Grenze, Kohlenstoffisotop; Sauerstoffisotop; Conodonten; Massenaussterben |
Dewey Decimal Classification: | Naturwissenschaften und Mathematik / Geowissenschaften, Geologie |
faculties: | Fakultät für Geowissenschaften |
Licence (German): | Keine Creative Commons Lizenz - es gelten der Veröffentlichungsvertrag und das deutsche Urheberrecht |