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Ocean acidification and the Permo-Triassic mass extinction.

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Area of Science:

  • Paleoclimatology
  • Marine geochemistry
  • Mass extinction events

Background:

  • The Permian-Triassic Boundary mass extinction is a major event in Earth's history.
  • Siberian Traps volcanism is a suspected trigger, possibly via ocean acidification.
  • Direct evidence for this acidification event has been scarce.

Purpose of the Study:

  • To reconstruct a high-resolution seawater pH record across the Permian-Triassic Boundary.
  • To investigate the role of ocean acidification in the mass extinction.
  • To link carbon injection events to changes in ocean chemistry.

Main Methods:

  • Utilized boron isotope data from marine archives.
  • Employed a quantitative modeling approach to interpret geochemical data.
  • Correlated geochemical findings with paleoclimatic and extinction event timelines.

Main Results:

  • The latest Permian showed high ocean alkalinity and low atmospheric CO2.
  • The first extinction phase coincided with stable ocean pH despite slow carbon injection.
  • A rapid, large carbon injection during the second extinction pulse caused abrupt ocean acidification.

Conclusions:

  • Ocean acidification, driven by rapid carbon release from Siberian Traps volcanism, was a key mechanism for the Permian-Triassic mass extinction.
  • Heavily calcified marine organisms were particularly vulnerable to the pH decline.
  • The study provides direct geochemical evidence for an acidification event during this extinction.