Eocene Thermal Maximum 3

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Eocene Thermal Maximum 3 (ETM3), also known as the K or X event, was a hyperthermal event that occurred during the middle of the Ypresian stage of the Eocene epoch.

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Timing

ETM3 has been dated to about 52.5 Ma. [1] It is demarcated in the chronostratigraphic record by a marked negative δ13C and δ18O excursion. [2]

Causes

ETM3 was caused by a massive input of isotopically light carbon into the atmosphere. It has been suggested that methane hydrate reservoirs, recharged over millennia after melting during previous Eocene hyperthermals, were the source of this light carbon during ETM3. [3]

Effects

ETM3, in conjunction with the other hyperthermal events of the Early Eocene, led to the onset of the Early Eocene Climatic Optimum (EECO), the warmest long-term climatic interval of the Cenozoic. [4] The diversity of benthic foraminifera decreased in the southeastern Atlantic Ocean during ETM3. [5]

See also

References

  1. ↑ Agnini, Claudia; Macrì, Patrizia; Backman, Jan; Brinkhuis, Henk; Fornaciari, Eliana; Giusberti, Luca; Luciani, Valeria; Rio, Domenico; Sluijs, Appy; Speranza, Fabio (14 May 2009). "An early Eocene carbon cycle perturbation at ~52.5 Ma in the Southern Alps: Chronology and biotic response". Paleoceanography and Paleoclimatology . 24 (2). Bibcode:2009PalOc..24.2209A. doi:10.1029/2008PA001649. hdl: 1874/385799 . ISSN   0883-8305 . Retrieved 11 March 2025– via Wiley Online Library.
  2. ↑ Frontalini, Fabrizio; Coccioni, Rodolfo; Catanzariti, Rita; Jovane, Luigi; Savian, Jairo F.; Sprovieri, Mario (1 July 2016). "The Eocene Thermal Maximum 3: Reading the environmental perturbations at Gubbio (Italy)". In Menichetti, Marco; Coccioni, Rodolfo; Montanari, Alessandro (eds.). The Stratigraphic Record of Gubbio: Integrated Stratigraphy of the Late Cretaceous–Paleogene Umbria-Marche Pelagic Basin. Geological Society of America. doi:10.1130/2016.2524(11). ISBN   9780813725246.
  3. ↑ Westerhold, Thomas; Röhl, Ursula; Donner, B.; Zachos, James C. (22 May 2018). "Global Extent of Early Eocene Hyperthermal Events: A New Pacific Benthic Foraminiferal Isotope Record From Shatsky Rise (ODP Site 1209)". Paleoceanography and Paleoclimatology . 33 (6): 626–642. Bibcode:2018PaPa...33..626W. doi:10.1029/2017PA003306. ISSN   2572-4517 . Retrieved 11 March 2025– via Wiley Online Library.
  4. ↑ Slotnick, B. S.; Dickens, G. R.; Hollis, C. J.; Crampton, J. S.; Strong, C. Percy; Phillips, A. (17 September 2015). "The onset of the Early Eocene Climatic Optimum at Branch Stream, Clarence River valley, New Zealand". New Zealand Journal of Geology and Geophysics . 58 (3): 262–280. Bibcode:2015NZJGG..58..262S. doi: 10.1080/00288306.2015.1063514 . S2CID   130982094.
  5. ↑ Thomas, Ellen; Boscolo-Galazzo, Flavia; Balestra, Barbara; Monechi, Simonetta; Donner, Barbara; Röhl, Ursula (1 July 2018). "Early Eocene Thermal Maximum 3: Biotic Response at Walvis Ridge (SE Atlantic Ocean)" . Paleoceanography and Paleoclimatology . 33 (8): 862–883. Bibcode:2018PaPa...33..862T. doi:10.1029/2018PA003375. ISSN   2572-4517 . Retrieved 11 March 2025– via Wiley Online Library.
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