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X-WR-CALNAME:Earth Planetary Science Seminar - Postdoc Brian Beaty "Digging
  Through Disaster: Bioturbation’s Impact on Ocean Nutrient Cycling Acros
 s Mass Extinctions".
X-WR-TIMEZONE:Pacific Time (US & Canada)
BEGIN:VEVENT
DTSTAMP:20260521T072312Z
UID:tag:localist.com\,2008:EventInstance_50905220295782
DTSTART:20251007T190000Z
DTEND:20251007T201500Z
DESCRIPTION:The loss of seafloor sediment mixing by burrowing animals acros
 s mass extinctions is often seen as a symptom of environmental crisis\, bu
 t rarely a driver. In this talk I will explore how bioturbating animals ma
 y have acted as “chemical engineers” of the oceans across mass extinct
 ions\, via their effect on nutrient exchange between sediment and seawater
 . I will present results from a regional case study focusing on Permian–
 Triassic marine sedimentary rocks in Svalbard\, Arctic Norway\, which span
  Earth’s greatest mass extinction ca. 252 million years ago. Using combi
 ned ichnological and geochemical analyses of samples collected across a wi
 de range of shallow marine depositional environments\, I demonstrate stati
 stically significant relationships between bioturbation intensities and ca
 rbon\, sulfur\, and phosphorus contents\, pointing towards a close couplin
 g between bioturbation and nutrient cycling across broad areas of the cont
 inental shelf. My results reveal a hierarchical recovery pattern: efficien
 t carbon and sulfur cycling resumed within tens to hundreds of thousands o
 f years after the extinction\, coincident with the return of shallow\, sim
 ple styles of bioturbation\, while restoration of phosphorus cycling to it
 s pre-extinction state lagged by up to one million years\, coincident with
  the return of deeper\, more complex styles of bioturbation. As a next ste
 p\, I plan to use Earth system modeling to test whether bioturbation-induc
 ed changes to seafloor organic carbon burial can substantially impact glob
 al climate over geologically rapid timescales (thousands of years). I also
  aim to explore whether longer-term changes in the global extent of biotur
 bation across the Phanerozoic may have led to differences in Earth system 
 sensitivity across various climate events\, including how modern patterns 
 of bioturbation may influence future climate change.\n\nBrian is a postdoc
 toral scholar at the Earth & Planetary Science department.\n\n For the Zoo
 m link\, please email Xueyao Cheng  > xc272@stanford.edu
LOCATION:Building 320\, Geology Corner\, Room 220 and Zoom
SUMMARY:Earth Planetary Science Seminar - Postdoc Brian Beaty "Digging Thro
 ugh Disaster: Bioturbation’s Impact on Ocean Nutrient Cycling Across Mas
 s Extinctions".
URL;VALUE=URI:https://events.stanford.edu/event/earth-planetary-science-sem
 inar-postdoc-brian-beaty-digging-through-disaster-bioturbations-impact-on-
 ocean-nutrient-cycling-across-mass-extinctions
CATEGORIES:Class/Seminar
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