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Title: Strontium and sulphur isotopes and the origin of Mid-Late Palaeozoic mass extinctions
Author: John, Eleanor Heulwen
ISNI:       0000 0001 3590 8930
Awarding Body: University of Leeds
Current Institution: University of Leeds
Date of Award: 2008
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This project focuses on two Palaeozoic mass extinction events: the Frasnian-Famennian crisis of the Late Devonian and the end-Guadalupian event of the Permian for which similar extinction mechanisms have been proposed. These have been evaluated by examining the nature of the Sr and S isotopic systems during these intervals. Proposed extinction mechanisms for the Late Devonian event include extraterrestrial impacts, rapid sea-level fluctuations, climate change eutrophication and the spread of anoxia in bottom waters. Many models invoke changes in nutrient fluxes related to proposed increases in continental weathering or hydrothermal/volcanic fluxes but these theories have not been tested on a global scale. This study attempted to address this by compiling high resolution ⁸⁷Sr/⁸⁶Sr ratio curves for an interval spanning the FrasnianFamennian boundary based on measurements in well-preserved conodont apatite from sections in Poland and Iowa.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available