Iben Winther Houg\u00e5rd defends her thesis,<\/p>\n
Jurassic Climate<\/strong>\u00a0– The spatial and stratigraphic extent of climatic perturbations<\/p>\n Supervisor:<\/strong> Assessment Committee:<\/strong> Summary:<\/strong> A digital version of the PhD thesis can be obtained from the PhD secretary Mikala Heckscher at\u00a0mikala@ign.ku.dk<\/em><\/p>\n","protected":false},"excerpt":{"rendered":" Iben Winther Houg\u00e5rd defends her thesis, Jurassic Climate\u00a0– The spatial and stratigraphic extent of climatic perturbations Supervisor: Associate Professor Christoph Korte, IGN Assessment Committee: Professor Michael Joachimski, Universit\u00e4t Erlangen-N\u00fcrnberg \u2013 Germany Associate Professor St\u00e9phane Bodin, AU Professor Robert Frei (chair), IGN Summary: The history of Earth\u2019s climate shows continuous fluctuations between warm and cool periods […]<\/p>\n","protected":false},"author":0,"featured_media":126191,"template":"","class_list":["post-126190","event","type-event","status-publish","has-post-thumbnail","hentry","event_category-phd-thesis-defense"],"acf":[],"aioseo_notices":[],"yoast_head":"\n
\nAssociate Professor Christoph Korte, IGN<\/p>\n
\nProfessor Michael Joachimski, Universit\u00e4t Erlangen-N\u00fcrnberg \u2013 Germany
\nAssociate Professor St\u00e9phane Bodin, AU
\nProfessor Robert Frei (chair), IGN<\/p>\n
\nThe history of Earth\u2019s climate shows continuous fluctuations between warm and cool periods that were punctuated by multiple short-term dramatic climate events. The geochemical composition of sedimentary sequences were affected by changes in the biosphere and climate of the past, which lead to variations in the stable isotopes and elements records. Fluctuations in the geochemical compositions need to be recognized to understand the spatial and stratigraphic extent of palaeoclimatic changes, in order to understand and predict the evolution of the modern climatic and environmental changes. The objectives of this PhD was to study Earth\u2019s natural environmental changes in the Jurassic by: i) Assessing the spatial and stratigraphic extent of oxygen deficiency during the Early Toarcian Oceanic Anoxic Event (T-OAE) in the southern part of the epicontinental shelf the Aubach section (SW Germany) and the continental margin, Sogno Core (N Italy), ii) reconstructing climatic fluctuations during the Middle and Late Jurassic from the perspective of two basin environments: the East Greenland Basin and the southern Germanic Basin (SW Germany, N Switzerland).
\nMacrofossils and bulk-rocks were analysed for geochemical proxies (\u03b413C and \u03b418O and element composition) and bulk-rocks for additional %TOC and molybdenum isotope ratios (\u03b498Mo). The chemostratigraphic records for the T-OAE for the Aubach section, SW Germany were constructed based on \u03b413C ratios from organic matter and carbonate, %TOC content and redox sensitive element proxies to investigate the evolution of seawater chemistry in this section. The temporal evolution of redox conditions on the southern epicontinental shelf and the Tethyan continental margin were investigated based on the \u03b498Mo ratios. Finally, reconstruction of climatic fluctuations during the Middle and Late Jurassic were based on trends in the \u03b413C and \u03b418O records from the East Greenland Basin and the southern Germanic Basin.<\/p>\n