<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div class="">Colloquium: CAR 101 at 3:30 p.m.</div><div class=""><br class=""></div><div class="">
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<!--StartFragment--><p class="MsoNormal" align="center" style="text-align:center;line-height:115%"><b class=""><span style="font-size:14.0pt;line-height:
115%" class="">Paroxysmal Deccan Eruptions and Climate Change cause <o:p class=""></o:p></span></b></p><p class="MsoNormal" align="center" style="text-align:center;line-height:115%"><b class=""><span style="font-size:14.0pt;line-height:
115%" class="">End-Cretaceous Mass Extinction<o:p class=""></o:p></span></b></p><p class="MsoNormal" align="center" style="text-align:center;line-height:115%"><b class=""><i class=""><span style="font-size:14.0pt;line-height:115%" class="">Gerta Keller, Princeton University <o:p class=""></o:p></span></i></b></p><p class="MsoNormal" align="center" style="text-align:center;line-height:115%"><b class=""><i class=""><span style="font-size:14.0pt;line-height:115%" class=""> </span></i></b></p><p class="MsoNormal">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 <i class="">state shift</i> 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).<o:p class=""></o:p></p>
<!--EndFragment--></div><div class=""><br class=""></div><div class=""><br class=""></div><div class="">Just released in <i class="">Science</i> 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.</div><div class=""><br class=""></div><div class=""></div></body></html>