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Shuram excursion

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The Shuram excursion, or Shuram-Wonoka excursion, is a change in δC, or in the ratio of carbon-13 to carbon-12, taking place during the Ediacaran Period. The exact time period of the excursion is debated among scholars, beginning around 573 Ma and ending around 562 or 551 Ma. It was first noticed in the Wonoka Formation in South Australia in 1990 and later in the Clemente Formation of Mexico in 1992 and the Shuram Formation in Oman in 1993. It is the largest negative δC excursion in Earth history, and recovery took 50 million years, although the apparent magnitude of the excursion may be distorted due to meteoric water diagenesis.

It is not known what caused the excursion. The Shuram excursion may have played a role in sparking the rise of animals that resulted later in the Cambrian explosion. The oxygen-consuming Ediacara biota experienced a radiation during the isotopic excursion as a response to the transient surplus of oxidants. Microbial blooms of oxygenic phototrophs regulated the recovery of the carbon cycle from the isotopic excursion.

References

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  2. Shi, Wei; Li, Chao; Luo, Genming; Huang, Junhua; Algeo, Thomas J.; Jin, Chengsheng; Zhang, Zihu; Cheng, Meng (24 January 2018). "Sulfur isotope evidence for transient marine-shelf oxidation during the Ediacaran Shuram Excursion". Geology. 46 (3): 267–270. Bibcode:2018Geo....46..267S. doi:10.1130/G39663.1.
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  5. Erwan Le Guerroué; et al. (20 April 2006). "Chemostratigraphic and sedimentological framework of the largest negative carbon isotopic excursion in Earth history: The Neoproterozoic Shuram Formation (Nafun Group, Oman)". Precambrian Research. 146 (1–2): 68–92. Bibcode:2006PreR..146...68L. doi:10.1016/j.precamres.2006.01.007. Retrieved 12 March 2023.
  6. Cui, Huan (15 September 2022). "Ediacaran Shuram Excursion interpreted, reinterpreted, and misinterpreted: A comment". Precambrian Research. 380: 106826. Bibcode:2022PreR..38006826C. doi:10.1016/j.precamres.2022.106826. Retrieved 18 December 2023 – via Elsevier Science Direct.
  7. Wei, Guang-Yi; Wang, Jiuyuan; Planavsky, Noah J.; Zhao, Mingyu; Bolton, Edward W.; Jiang, Lei; Asael, Dan; Wei, Wei; Ling, Hong-Fei (1 July 2022). "On the origin of Shuram carbon isotope excursion in South China and its implication for Ediacaran atmospheric oxygen levels". Precambrian Research. 375: 106673. Bibcode:2022PreR..37506673W. doi:10.1016/j.precamres.2022.106673. S2CID 248115031.
  8. Colin Barras (Nov 9, 2019). "The weird creatures that might be the very first complex animals". New Scientist.
  9. Shields, Graham A.; Mills, Benjamin J. W.; Zhu, Maoyan; Raub, Timothy D.; Daines, Stuart J.; Lenton, Timothy M. (2 September 2019). "Unique Neoproterozoic carbon isotope excursions sustained by coupled evaporite dissolution and pyrite burial". Nature Geoscience. 12 (10): 823–827. Bibcode:2019NatGe..12..823S. doi:10.1038/s41561-019-0434-3. hdl:10871/39006. S2CID 201827639. Retrieved 12 January 2023.
  10. Cañadas, Fuencisla; Papineau, Dominic; Leng, Melanie J.; Li, Chao (10 January 2022). "Extensive primary production promoted the recovery of the Ediacaran Shuram excursion". Nature Communications. 13 (1): 148. Bibcode:2022NatCo..13..148C. doi:10.1038/s41467-021-27812-5. PMC 8748710. PMID 35013337.
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