Letter | Published:

K–Ar and 40Ar/39Ar Age of the Laschamp geomagnetic polarity reversal

Nature volume 274, pages 462464 (03 August 1978) | Download Citation

Subjects

Abstract

THE Laschamp polarity reversal1 remains one of the best documented cases of a recent excursion of the Earth's magnetic field. Unlike lake sediments, the Laschamp volcanics have a stable TRM (thermo remanent magnetism) which is not susceptible to structural degradation or detrital inclination error. Some workers have claimed to have seen the Laschamp excursion in recent sediments2, while others have been unable to establish a correlation between the Laschamp and sedimentary core samples3,4. One of the main difficulties with such a correlation is the uncertainty in the age of the Laschamp and Olby lava flows which record the excursion. We have performed a new series of K–Ar and 40Ar/39Ar analyses which suggest that the Laschamp excursion is significantly older than the widely quoted age reported by Bonhommet and Zähringer1.

Access optionsAccess options

Rent or Buy article

Get time limited or full article access on ReadCube.

from$8.99

All prices are NET prices.

References

  1. 1.

    & Earth planet. Sci. Lett. 6, 43–46 (1969).

  2. 2.

    & Nature 253, 705–707 (1975).

  3. 3.

    & Earth planet. Sci. Lett. 13, 181–190 (1971).

  4. 4.

    & Nature 263, 490–491 (1976).

  5. 5.

    & Eos 59, 388–389 (1978).

  6. 6.

    et al. J. Geomag. Geoelec. 25, 447–474 (1973).

Download references

Author information

Affiliations

  1. Geophysics Division, Department of Physics, University of Toronto, Toronto, Ontario, Canada M5S 1A7

    • CHRIS M. HALL
    •  & DEREK YORK

Authors

  1. Search for CHRIS M. HALL in:

  2. Search for DEREK YORK in:

About this article

Publication history

Received

Accepted

Published

DOI

https://doi.org/10.1038/274462a0

Further reading

Comments

By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.