extinction Rob Newton Tianchen He Jacopo Dal Corso Paul Wignall Ben Mills Alex Dunhill Highlighting an idea presented in He et al 2020 Science Advances DOI 101126sciadvabb6704 ID: 914492
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Slide1
Ocean sulfate scarcity as a pre-condition for Large Igneous Province driven mass
extinction
Rob Newton
, Tianchen He, Jacopo Dal Corso, Paul Wignall, Ben Mills, Alex DunhillHighlighting an idea presented in:
He et al.,
2020. Science Advances. DOI: 10.1126/sciadv.abb6704
Slide2Connecting low sulfate, anoxia and LIP driven warming & mass extinction
New T-J CAS isotope data
Rapid pulse of anoxia coincident with extinction
Rate of S-isotope change indicates ocean sulfate <1 mMHe et al., 2020. Science Advances. DOI: 10.1126/sciadv.abb6704
Slide31) PETM: Yao et al, 2018. Science
2) K-Pg: Witts et al, 2018. GCA
3) OAE 2: Owens et al, 2013. PNAS
4) OAE 2: Adams et al, 2014. Nat. Geo.5) eTOAE: Newton et al, 2011. Geology6) T-J: He et al 20207) P-T: Song et al, 2014. GCA9) P-T: Luo et al, 2010. EPSL9) SPICE & others: Gill et al, 2007. P310) SPICE: Gill et al, 2011. Nature11) early Cambrian: He et al, 2019. Nat. Geo.Boxes are estimates derived from sulfur isotope rate of change methodRed boxes are estimates of sulfate associated with the expansion of anoxia
Figure: Rob Newton, unpublished
.Halite fluid inclusion data from Holt et al, 2014 and references therein
Phanerozoic sulfate concentrations and anoxic events
Low sulfate frequently associated with anoxia & LIP warming
Likely generated by
evaporite
deposition
Slide4He
et al., 2020. Science Advances. DOI: 10.1126/sciadv.abb6704
The sulfate-methane-oxygen feedback
Low sulfate established by evaporite deposition prior to LIP eruptionShallows SMTZIncreases reactivity of OM delivered to methanogensIncreases methane flux to water column & consumption of oxygenRapid LIP driven climate warming accelerates methane feedback via:
Temperature sensitivity of methanogenesis
Increased nutrient influx and OM productionSuppression of sulfate concentrations via pyrite burial