Shuram excursion

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The Shuram excursion, or Shuram-Wonoka excursion, is a change in

Ma and ending around 562[1] or 551[2] Ma. It was first noticed in the Wonoka Formation in South Australia in 1990 and later in the Shuram Formation in Oman in 1993.[3] It is the largest negative δ13C excursion in Earth history, and recovery took 50 million years,[4] although the apparent magnitude of the excursion may be distorted due to meteoric water diagenesis.[5]

It is not known what caused the excursion.

Ediacara biota experienced a radiation during the isotopic excursion as a response to the transient surplus of oxidants.[8] Microbial blooms of oxygenic phototrophs regulated the recovery of the carbon cycle from the isotopic excursion.[9]

References

  1. S2CID 214806821
    . Retrieved 12 March 2023.
  2. doi:10.1130/G39663.1
    .
  3. doi:10.1016/j.gsf.2017.11.006
    .
  4. doi:10.1016/j.precamres.2006.01.007
    . Retrieved 12 March 2023.
  5. doi:10.1016/j.precamres.2022.106826
    . Retrieved 18 December 2023 – via Elsevier Science Direct.
  6. S2CID 248115031
    .
  7. ^ Colin Barras (Nov 9, 2019). "The weird creatures that might be the very first complex animals". New Scientist.
  8. S2CID 201827639
    . Retrieved 12 January 2023.
  9. PMID 35013337
    .
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