Tracing global ocean oxygenation from calcitic brachiopods

August 4, 2020Publication, Research, Students and postdocs

The uranium isotope composition of seawater provide insights to how much sediment burial occurs globally in anoxia settings. Therefore, it is desirable to measure uranium isotopes to track the oxygenation state of the oceans through geological time. However, there is currently no geological archive that can reliably record the composition of ancient seawater. Calcitic brachiopods … Read More

New paper: The impact of land plant evolution on Earth’s climate and oxygenation state

May 14, 2020Publication, Research

The colonization of land by plantss, fungi and animals has had a profound impact on Earth’s climate and oxygenation state. In a comprehensive review paper, we have summarize the current state of knowledge and compiled available evidence in support that terrestrial life has caused: Atmospheric CO2 decline and climatic cooling (permanent transition) Atmospheric O2 rise … Read More

New GCA paper: Volcanic eruptions triggered repeated marine anoxia and reveal global-scale feedbacks during the Permian-Triassic mass extinction 250 million yeers ago

April 18, 2020Publication, Research, Students and postdocs, Uncategorized

The largest animal extinction event in recorded history occurred 251 Ma at the Permian-Triassic boundary coinciding with expansive marine anoxia. In a new study, led by postdoc Feifei Zhang, of a greatly expanded dolomite section from the Carnic Alps, Austria, marine anoxia is found to have expanded in two pulses separated by ~100,000 years. Global … Read More

New study solves 500 million year old animal breathing paradox

August 12, 2019Publication, Research

Animals breath oxygen, but fossils of some of the earliest animals are found in what appears to be anoxic parts of the oceans. New research, led by Tais W. Dahl in collaboration with researchers from GEUS and Royal Holloway University London, shows that fluctuations in O2 availability at the seafloor allowed benthic animals to invade … Read More

Tais honored as Guest Professor at the China University of Geosciences, Wuhan

January 6, 2019Awards, Research
On Jan 4, 2019 Vice President Professor Yongsheng Liu of the China University of Geosciences Wuhan (CUG-W) gratulates Tais W. Dahl with the new title.   Members of the award ceremony in front of the State Key Laboratory for Geological Processes and Mineral Resources (GPMR). From left: GPMR Secretary Huaqiang Weng, Postdoc Feifei Zhang, Prof. Chao [...]

Nordic Winter Meeting January 2018 – 4 presentations

December 18, 2017Outreach, Presentations, Research, Students and postdocs

Our group will give several presentation at the Nordic Winter Meeting at DTU in Lyngby, Denmark Wednesday Jan 10, 2018 10.00-11.00 Student poster presentations Magnus A. R, Harding “Surface analyses of fossil leaves” Julius C. Havsteen “The Silurian Lau event – testing plant weathering as driver for ocean anoxia and animal extinction”   Thursday Jan 11, … Read More

New paper in press: Ocean redox conditions between the Neoproterozoic Snowballs

December 18, 2017Publication, Research, Students and postdocs

A new paper on the redox conditions in the oceans after the Sturtian and before the Marinoan ‘Snowball’ glaciations is now press in Precambrian Research. Our results suggest that oceans remained largely anoxic after the Sturtian glaciation and that something else triggered oxygenation of the Ediacaran oceans after the Marinoan glaciation. This ‘something’ could be due to the way animals affect the global … Read More