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The evolution of shallow-marine carbonate deposits during times of environmental changes: two case studies from the Jurassic

PhD defence, Friday 24 January 2020. Jan Danisch.

2020.01.24 | Sunitha Satkunam

Jan Danisch

During his studies, Jan Danisch examined Early and Middle Jurassic shallow-marine sediments from the Central High Atlas Basin in Morocco. The focus was on how and where carbonate was produced and how these systems responded in times of environmental changes. The first instance at the Sinemurian-Pliensbachian transition is characterized by a partial demise of the deep-neritic carbonate factories and changing compositions of shallow-neritic carbonate factories. These developments are best described as a backstepping of the biogenic carbonate factories, which stand in contrast to the observations made in some European reference sections. The second instance is the Early Bajocian, where a severe carbonate demise event is recorded in the entire eastern part of the basin. However, in the western parts of the basin, the demise did not occur and carbonate sedimentation is uninterrupted. This pronounced regional character of the demise event raises several questions about the causes and which environmental parameters changed.

Jan Danisch contributed in the characterization of carbonate factories in the Early and Middle Jurassic in the study area and how they responded to environmental change. The research contributed to the general understanding of the two studied events (Sinemurian-Pliensbachian, Early Bajocian), its extents and impacts on marine sedimentary systems.

The PhD degree was completed at the Department of Geoscience, Faculty of Natural Sciences, Aarhus University.

This résumé was prepared by the PhD student.

Time: Friday, 24 January at 14.15
Place: Building 1671, room 137, the Lecture Theatre, Department of Geoscience, Høegh-Guldbergs Gade 2, Aarhus University, 8000 Aarhus C.
Title of PhD thesis: Environmental changes and their impact on neritic carbonate factories during the Sinemurian-Pliensbachian and the Early Bajocian in the Central High Atlas Basin (Morocco)
Contact information: Jan Danisch, e-mail: jan.danisch@geo.au.dk
Members of the assessment committee:
Professor Nereo Preto, Department of Geoscience, University of Padova, Italy
Assistant Professor Micha Ruhl, Department of Geology, Trinity College Dublin, The University of Dublin, Ireland
Professor Christian Tegner (chair), Department of Geoscience, Aarhus University 
Main supervisor:
Associate Professor Stéphane Bodin, Department of Geoscience, Aarhus University
Language: The PhD dissertation will be defended in English

The defence is public.
The PhD thesis is available for reading at the Graduate School of Science and Technology/GSST, Ny Munkegade 120, building 1521, 8000 Aarhus C.

PhD defence
12183 / i43