Laschamp event

The Laschamp or Laschamps event^[a], also termed the Adams event,^[2] was a geomagnetic excursion (a short reversal of the Earth's magnetic field). It occurred between 42,200 and 41,500 years ago, during the Last Glacial Period. It was discovered from geomagnetic anomalies found in the Laschamps and Olby lava flows near Clermont-Ferrand, France in the 1960s.^[3]^[4]

The Laschamp event was the first known geomagnetic excursion and remains the most thoroughly studied among the known geomagnetic excursions.^[5]

It is named after the village of Laschamps, part of the commune of Saint-Genès-Champanelle in France.

^ "Changing Name for Earth's Changing Poles". Eos. 13 March 2019. Retrieved 15 November 2021.
^ Cooper, Alan; Turney, Chris (9 March 2020). The Adams Event, a geomagnetic-driven environmental crisis 42,000 years ago (Report). Copernicus Meetings. doi:10.5194/egusphere-egu2020-12314.
^ Bonhommet, N.; Zähringer, J. (1969). "Paleomagnetism and potassium argon age determinations of the Laschamp geomagnetic polarity event". Earth and Planetary Science Letters. 6 (1): 43–46. Bibcode:1969E&PSL...6...43B. doi:10.1016/0012-821x(69)90159-9.
^ Hall, Chris M.; York, Derek (August 1978). "K–Ar and 40Ar/39Ar Age of the Laschamp geomagnetic polarity reversal". Nature. 274 (5670): 462–464. doi:10.1038/274462a0. ISSN 0028-0836.
^ Laj, C.; Channell, J.E.T. (27 September 2007). "5.10 Geomagnetic Excursions" (PDF). In Schubert, Gerald (ed.). Treatise on Geophysics. Vol. 5 Geomagnetism (1st ed.). Elsevier Science. pp. 373–416. ISBN 978-0-444-51928-3. Retrieved 18 February 2021 – via elsevier.com.

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[1] "Changing Name for Earth's Changing Poles". Eos. 13 March 2019. Retrieved 15 November 2021.

[3] Cooper, Alan; Turney, Chris (9 March 2020). The Adams Event, a geomagnetic-driven environmental crisis 42,000 years ago (Report). Copernicus Meetings. doi:10.5194/egusphere-egu2020-12314.

[Bonhommet-Zähringer-1969-4] Bonhommet, N.; Zähringer, J. (1969). "Paleomagnetism and potassium argon age determinations of the Laschamp geomagnetic polarity event". Earth and Planetary Science Letters. 6 (1): 43–46. Bibcode:1969E&PSL...6...43B. doi:10.1016/0012-821x(69)90159-9.

[5] Hall, Chris M.; York, Derek (August 1978). "K–Ar and 40Ar/39Ar Age of the Laschamp geomagnetic polarity reversal". Nature. 274 (5670): 462–464. doi:10.1038/274462a0. ISSN 0028-0836.

[Laj-Channell-2007-6] Laj, C.; Channell, J.E.T. (27 September 2007). "5.10 Geomagnetic Excursions" (PDF). In Schubert, Gerald (ed.). Treatise on Geophysics. Vol. 5 Geomagnetism (1st ed.). Elsevier Science. pp. 373–416. ISBN 978-0-444-51928-3. Retrieved 18 February 2021 – via elsevier.com.

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