Mass extinctions, climatic and oceanographic changes at the Devonian/Carboniferous boundary
Year: 2005
Type: dissertation
Abstract: A positive carbon isotope excursion is reported for the global Hangenberg Event at the Devonian/Carboniferous boundary,\nrevealed by a correlation of Austrian, Italian, French and German sections using high-resolution conodont\nbiostratigraphy. The δ13Ccarb,org excursions indicate global change in the isotopic composition of marine dissolved\nHCO3- and atmospheric CO2, which resulted from the increased burial of organic matter by globally widespread black shale\ndeposition during high seawater temperatures, as indicated by δ18Ophosph of conodonts. Low temperatures are recorded in\nbeds overlying the regressive event phase, correlated previously with a glacial episode in Gondwana. Glacially induced\nsea-level changes were testified by a correlation of Moroccan siliciclastic beds using litho- and ammonoid stratigraphy.\nThe data support the hypothesis that increased Corg burial and oceanic anoxia triggered glaciations, eustatic sea-level\nchanges and mass extinctions at the D/C boundary.
Author: Kaiser, Sandra Isabella
Language: English
Subfield: Paleontology
Field: Earth and Planetary Sciences
Domain: Physical Sciences
SDG: Climate action
Open Access status: green
OpenAlex ID: W7058151694