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.

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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):License LogoKeine Creative Commons Lizenz - es gelten der Veröffentlichungsvertrag und das deutsche Urheberrecht