A5083306239- Geology and Paleoclimatology Research
- Paleontology and Stratigraphy of Fossils
- Astro and Planetary Science
- Methane Hydrates and Related Phenomena
- Geomagnetism and Paleomagnetism Studies
- Isotope Analysis in Ecology
- Scientific Research and Discoveries
- Geological formations and processes
Aarhus University
2024-2025
University of Copenhagen
2020-2024
Abstract The Cambrian is the most poorly dated period of past 541 million years. This hampers analysis profound environmental and biological changes that took place during this period. Astronomically forced climate cycles recognized in sediments anchored to radioisotopic ages provide a powerful geochronometer has fundamentally refined Mesozoic–Cenozoic time scales but not yet Palaeozoic. Here we report continuous astronomical signal detected as geochemical variations (1 mm resolution) late...
Cosmogenic nuclides measured in depth-profiles are a valuable tool for reconstructing the depositional and erosional history of sedimentary sequences. The burial ages these sequences can be determined by measuring cosmogenic nuclide pairs such as 26Al 10Be. However, some conventional approaches neglect post-burial production, major source error.A new model, CosmoChron (Sørensen et al., 2024, Quat. Geochron. 85, 101618), enables more versatile comprehensive analysis integrating data...
Marine euxinia can amplify phosphorous-limited marine productivity by recycling phosphorous from sediments, creating a feedback loop that increases oxygen consumption and ultimately leads to widespread oceanic anoxia. This phenomenon is potentially more dangerous when loss arises in coastal zones. Here, we present empirical evidence show this cascade was set off the Cambrian Earth system. Carbon isotopes Mo enrichments well-dated sediment records Steptoean Positive Isotope Excursion (SPICE)...
<p>The Cambrian is the most poorly dated period of past 541 million years Earth history. This hampers analysis profound environmental and biological changes that took place during this period. Astronomically forced climate cycle recognized in sediments anchored to radioisotopic ages provides a powerful geochronometer has fundamentally refined Mesozoic–Cenozoic time scales but not yet Palaeozoic. Here we report continuous astronomical signal detected as geochemical...
<p>Profound environmental and biological changes took place during the Cambrian, yet, compared to other Phanerozoic intervals, Cambrian time framework remains poorly constrained, which severely hinders a detailed understanding of timing progression these major geological events. In this study, we report radiometrically anchored astrochronologic across late interval, using high-resolution aluminum (Al) series (1 mm resolution) through Alum Shale Formation in Scania, southernmost...