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Evidence for atmospheric carbon injection during the end-Permian extinction


knocker

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Posted
  • Location: Camborne
  • Location: Camborne
    Abstract

     

    The end-Permian mass extinction is marked by pronounced terrestrial ecosystem turnover and a severe loss of marine invertebrate biodiversity. This extinction event is accompanied by a prominent negative carbon-isotope excursion indicating massive changes in the global carbon cycle across the Permian-Triassic boundary. In this study, we present organic carbon-isotope data from land plant cuticles, fossil wood fragments, and bulk organic matter recovered from the Amb section in the Salt Range, Pakistan. We apply δ13C data from cuticles as a proxy record for the carbon-isotope composition of atmospheric CO2 across the Permian-Triassic boundary. The data show an ∼5.5‰ negative excursion in terrestrial organic matter, reflecting the change in carbon-isotope composition of atmospheric CO2. Our data demonstrate that these atmospheric changes coincide with biotic (mass extinction) and abiotic (carbonate carbon-isotope perturbation) changes in the marine realm, hence affecting the entire ocean-atmosphere system.

     

     

    http://geology.gsapubs.org/content/41/5/579.abstract

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    Posted
  • Location: Alresford, Near Colchester, Essex
  • Weather Preferences: As long as it's not North Sea muck, I'll cope.
  • Location: Alresford, Near Colchester, Essex

    Stating the obvious, but worded in gobbledygook imho.

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    Posted
  • Location: Alresford, Near Colchester, Essex
  • Weather Preferences: As long as it's not North Sea muck, I'll cope.
  • Location: Alresford, Near Colchester, Essex

    I would say that the Siberian Traps are evidence of one of the biggest known volcanic episodes, which would involve a huge release of carbon dioxide into the atmosphere and this occurred at the end of the Permian period - the time of the great dying - the biggest mass extinction in our history -  dwarfing the Cretaceous / tertiary event, which was curtains for the dinosaurs (apart from birds :) )

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