<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=""><br class=""></div><div class="">Prof. Gerta Keller (Princeton University) is visiting this week to present a seminar in the Department of Earth, Ocean & Atmospheric Science. Gerta has performed the most intensive forensic study of the Cretaceous-Tertiary mass extinction to find that the famed asteroid impact was not the culprit. Gerta’s work shows that massive continental flood basalt eruptions from the Deccan created global havoc that timed precisely with the extinctions. She has new chronological and geochemical results, and a Science paper coming out this Thursday, that she will be speaking about in regards to the cause of the extinction. I have included a title and abstract for her talk below.</div><div class=""><br class=""></div><div class="">Keller seminar: Friday, February 22, in CAR 101 at 3:30 pm.</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=""><font color="#2c1376" class="">Paroxysmal Deccan Eruptions and Climate Change cause <o:p class=""></o:p></font></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=""><font color="#2c1376" class="">End-Cretaceous Mass Extinction<o:p class=""></o:p></font></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=""><font color="#2c1376" class="">Gerta Keller, Princeton University <o:p class=""></o:p></font></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=""><font color="#1a0a53" class=""> </font></span></i></b></p><p class="MsoNormal"><font color="#0042aa" class="">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)</font><font color="#1a0a53" class="">.</font><o:p class=""></o:p></p>
<!--EndFragment--></div><div class="">We look forward to seeing you at the seminar.</div><div class="">Thanks,</div><div class="">Munir.</div><div class=""><br class=""></div><div class=""><br class=""><div class="">
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