How did the climate fluctuate in Early Jurassic ? Investigations of belemnites from South Germany give the answer

University of Copenhagen, Department of Geology and Natural Resources Management, Copenhagen, Denmark
ChemistryEarth Science
Ended on 8/30/17
Campaign Ended
  • $34
  • 5%
  • Finished
    on 8/30/17

About This Project

During the last two years, I have invested plenty of time researching the Latest Sinemurian to Earliest Toarcian oxygen and carbon isotope fluctuations from belemnite rostra (calcitic internal skeletons of extinct specimens of squid-like animals). Last year I submitted my bachelor thesis on the subject and now my final research gave such interesting results, that they must be presented in a publication. But before I can publish the data I would love to present the dataset for other researchers.

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What is the context of this research?

In the Early Jurassic (Late Sinemurian-Early Toarcian) siliciclastic and carbonate sediments, now exposed in the Aubach section in SW Germany, were deposited in the Swabo-Franconian Basin at mid-latitudes in a relatively shallow marine epicontinental environment of the Laurasian seaway north of Tethys Ocean. From this succession, a total of 225 subsamples were taken from calcitic belemnite rostra, checked for diagenetic alteration by the common screening techniques, and subsequently analyzed for carbon and oxygen isotopes. Data outcome from diagenetic alteration are useless in the interpretation of temperature proxies from oxygen isotopes and must be ignored. Carbon isotopes give knowledge about the source, whether it is an inorganic or organic carbon source.

What is the significance of this project?

The belemnites are free swimming animals living in the free water column of relative shallow waters. The rostrum of a belemnite is produced of 99.9 % calcium carbonate fractionated from seawater isotopic composition reflecting the water's environment and temperature.

Previously data show a significant cooling in Late Pliensbachian. However, these high-resolution data show more than one cooling period from oxygen isotopes. The carbon isotopes show a negative excursion during the Sinemurian-Pliensbachian boundary with relation to an injection of isotopically light carbon e.g. Methane to the atmosphere-ocean system. Along with the cooling periods at the Late Plienbachian 'cooling' Event (LPE), the positive excursion of δ13C give support to the decline in atmospheric carbon dioxide level.

What are the goals of the project?

The initial goals of this project were to produce data in the lab from collected belemnites of Early Jurassic stage. The next step were to interpret the produced data. As the project moved on the data got more and more interesting. I produced a nice and large dataset and as more I interpreted the data results as more significant the cooling periods become.

The middle part of the project was to write the thesis of my bachelor project and produce some nice figures along with drawing the sedimentary log of the succession.

The final part of my research project is to present the data at the GeoBremen 2017 conference in Bremen, Germany, and to submit my manuscript for publication.


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My presentation of my research during this postersession of the conference (GeoBremen 2017) will complete my project. The final part of my research project will be a publication later in this year. Without the funding the conference will not a possibility for me. It will be great chance for me to present my research to interested geologists and colleges.

Endorsed by

I know Jesper from a joint present Jurassic project based on palynological and geochemical data. I am looking forward to see the final poster from his early Jurassic project at the GeoBremen 2017 conference with all the included data, which are showing cooling events in Late Pliensbachian.

Flag iconProject Timeline

I have all the needed data for my research, and the interpretation is almost done. The only thing missing are the presentation at the conference GeoBremen 2017, at the University of Bremen from 24'th to 27'th of September 2017, and the submitting of the manuscript for the publication at the end of 2017.

Jul 16, 2017

Project Launched

Sep 24, 2017

GeoBremen 2017 Conference

Dec 01, 2017

Submitting publication for review

Meet the Team

Jesper Allan Frederiksen
Jesper Allan Frederiksen
B.Sc. in Geology-Geoscience


University of Copenhagen, Department of Geology and Natural Resources Management
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Team Bio

We are a great team of one Professor, Christoph Korte (UCPH) one Post Doc., Clemens V. Ullmann (CUC), one Ph.D-student, Malgorzata Rizzi (UCPH) and two M.Sc.-students, Iben W. Houggaard and I (UCPH). We all met at UCPH and we all are interested in Late Mesozoic belemnites and geochemistry.

The project from Aubach section is my Bachelor project and I am the most dedicated to this project, thus I am the one presenting the project at the conference and as the first author of the article publication.

Jesper Allan Frederiksen

I am a 41-years old Master student at Copenhagen University at the Department of Geology and Natural Resources Management. My supervisor for my Bach. thesis and my M.Sc. thesis is Christoph Korte (Associate Professor). He is a professor in geochemistry and sedimentary basins and its stratigraphy. I am very interested in geochemistry and macro fossils from Late Mesozoic Era-them.

My specialties are stable isotopic geochemistry of biogenic ancestry, and the interpretation of trace elements concentration in fossils and bulk rocks. I find it really interesting understanding the formation of sedimentary basins and the stratigraphy of it.

I live together with my really nice girlfriend, Suzanne, who is also a geology student. I have a 12-years old son, Tobias, from another relationship.

Project Backers

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  • 5%Funded
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