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SUMMARY:Towards a 500 Million-Year History of Earth’s Atmospheric CO2 - 
 Hana Jurikova\, University of St Andrews
DTSTART:20240528T110000Z
DTEND:20240528T120000Z
UID:TALK215350@talks.cam.ac.uk
CONTACT:Dr Rachael Rhodes
DESCRIPTION:Earth’s atmospheric CO2 concentration for the Phanerozoic Eo
 n (the last ~540 million years) has been estimated from proxies and models
  with varying degrees of success\, resulting in considerable discrepancies
  between estimates. Recent advances in applying boron isotopes to foramini
 fera have revolutionised our understanding of Cenozoic CO2 levels (the las
 t ~66 million years) leading to a growing consensus for Earth’s more rec
 ent history. However\, questions remain about the limitations of the boron
  isotope proxy as dependent on the extent of preservation of marine sedime
 nts and\, consequently\, deep-time boron-based reconstructions from Earth'
 s rock record have been regarded as controversial. In this talk\, I will m
 ake the case that the boron isotope composition of well-preserved brachiop
 od shells provides a robust tool for extending our knowledge of CO2 throug
 hout the Phanerozoic\, and by showcasing new Mesozoic and Palaeozoic recor
 ds I will review the role of CO2 in Earth's major climate transitions and 
 mass extinction events.
LOCATION:Department of Earth Sciences\, Tilley Lecture Theatre
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