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SUMMARY:Carbon subduction and mid-ocean ridge emissions modulate icehouse-
 greenhouse climates - Ben Mather\, University of Sydney
DTSTART:20240414T130000Z
DTEND:20240414T140000Z
UID:TALK215830@talks.cam.ac.uk
CONTACT:Megan Holdt
DESCRIPTION:The cycling of carbon between the deep Earth and the atmospher
 e plays a significant role in modulating global climate. While carbon dega
 ssing at volcanic arcs are generally assumed to be the main contributor to
  atmospheric carbon\, our research reveals that mid-ocean ridge degassing 
 surpasses arc emissions before 50 Ma. Combining thermodynamic modelling of
  subducting carbon reservoirs with reconstructions of remobilised crustal 
 carbon through the Phanerozoic\, we show that volcanic arc emissions reduc
 e to merely ~12% of mid-ocean ridge outflux before 120 Ma. This reflects t
 he absence of deep-sea carbonate sediments entering subduction zones\, lea
 ving less voluminous metamorphic degassing of continental carbonate platfo
 rms next to convergent margins as the main mechanism for arc CO2 degassing
 . We find that the balance between oceanic volcanic outgassing and removal
  of carbon via subduction tracks major climate shifts\, including the Late
  Palaeozoic\, Late Cretaceous and Cenozoic icehouse climates. 
LOCATION:Wolfson Lecture Theatre
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