[Eoas-seminar] EOAS Colloquium today CAR 101 at 3:30 pm

[eoas-seminar at lists.fsu.edu]

Colloquium: CAR 101 at 3:30 p.m.

Paroxysmal Deccan Eruptions and Climate Change cause

End-Cretaceous Mass Extinction

Gerta Keller, Princeton University

 

Deccan volcanism and the Chicxulub impact are both linked to the end-Cretaceous mass extinction. The timing of these events relative to the mass extinction has long remained controversial. Mercury (Hg) anomalies from atmospheric fallout of Deccan eruptions in stratigraphic records provide a potential tool to discern the effects of volcanism versus impactor. The high-resolution Hg record from the astronomically-tuned Elles section (Tunisia), correlated with U-Pb geochronology of Deccan volcanism provides a robust proxy for Deccan volcanism. The time-resolved Hg record reveals massive volcanic eruptions (~30% of total Deccan volume) over the last 45 ky of the Maastrichtian ending with paroxysmal eruptions during the last 25 ky accompanied by ocean acidification and hyperthermal warming ending with the mass extinction. Recent speculations that the Chicxulub impact triggered a state shift in Deccan eruptions ~70 ky pre-KPB causing the mass extinction are unconfirmed and evidence for an impact coinciding with the mass extinction is lacking. (Science Feb. 21, 2019).



Just released in Science this morning is a set of papers on the chronology of the Deccan, some of which Gerta will speak about in her seminar this afternoon. Gerta’s paper is attached below.



Munir Humayun
Professor
Department of Earth, Ocean, and Atmospheric Science
	& National High Magnetic Field Laboratory
Florida State University
1800 E. Paul Dirac Drive
Tallahassee, FL32310
(850) 644-1908
(850) 644-0827 (FAX)




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