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Marine anoxia during Oceanic Anoxic Event 2

PhD student Sophie Gangl will present a research seminar on the following topic.

The Cenomanian–Turonian anoxic event or ‘Oceanic Anoxic Event 2’ (OAE 2; 94 Ma) marks one of the most severe climatic disturbances in Earth’s history and is associated with widespread ocean de-oxygenation, or anoxia. Constraining, in detail, the timing, magnitude and progression of ocean anoxia during OAE 2 improves understanding of how the complex ocean-atmosphere system is likely to respond to today’s high atmospheric CO2 levels, and includes global warming, ocean acidification, sea-level rise, and ocean anoxia.

Within this project, sedimentary records from a well-studied site in the Tethys as well as from the under-represented Southern palaeo-Pacific Ocean were analysed for their carbon (C)-isotope ratios as well as redox-sensitive metals and their isotopes, which suggest similar redox-fluctuations in both areas during OAE 2. Furthermore, grey and red shales were investigated for their potential as a new archive for palaeo-redox studies in order to complement more traditional archives.

Date Wednesday, 4 September 2019
Time 1:00pm - 2:00pm
Audience All University
Event Category Sciences
Event Type Departmental Seminar
CampusDunedin
DepartmentGeology
LocationBenson Common Room (room Gn9) , Department of Geology, University of Otago.
Contact Emailsophie.briggs@otago.ac.nz

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