Seminar über Planeten und Kometen

Seminar über Planeten und Kometen

In den Seminaren der Abteilung Planeten und Kometen werden von Wissenschaftler, Postdocs und Gästen Entdeckungen und Forschungsergebnisse aus den Missionen und Projekten zu den Themen Planeten, Kometen, Asteroiden und Staub präsentiert.

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Immense volcanism and extraterrestrial impact are the two main suspects in driving the Cretaceous-Palaeogene (K-Pg) mass extinction, but incontrovertible empirical evidence for how either caused ecological collapse has up to now been scant. In my talk I will present new boron isotope data revealing rapid fluctuations in ocean pH and atmospheric pCO2 at the K-Pg, indicating ocean acidification caused by impact, not volcanism, prompted marine mass extinction. Furthermore, by coupling with earth system models, our pH estimates allow us to solve a longstanding geological puzzle: what was the cause of the post-extinction collapse in surface-deep carbon isotope gradients in the ocean, and what does it convey about the Earth’s ecological recovery after the mass extinction event? [mehr]
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