The Laschamp geomagnetic ‘event’

Abstract

SHORT lived geomagnetic ‘events’ provide useful stratigraphic markers; they may enhance climatic and evolutionary changes1,2 and they provide stringent parameters for geomagnetic models. During such events the virtual geomagnetic pole undergoes excursions outside the usual range of secular variation but they are usually brief, generally lasting about 105 yr, so that their magnetic record in deep sea sediments is often lost because of post-depositional remagnetisation3 and because of biological activity in the upper few decimetres of the sediments4. In lake sediments, where sedimentation is more rapid, the magnetic record is better preserved. Dating is, however, difficult because secular variations in atmospheric carbon isotopes and irregular distributions in the environment are known to produce errors. Furthermore, geomagnetic events, the levels of which may have been displaced by bioturbation4, are usually dated by assuming uniform sedimentation between 14C dated horizons. The Laschamp event, in particular, seems to have been detected at 12 locations although the reported age (Table 1) varies between 7,000 and 17,000 yr BP, a range outside the quoted error for individual determinations, but within the realistic error in dating.

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References

  1. 1

    Harrison, C. G. A., and Prospero, J. M., Nature, 250, 563–565 (1974).

    ADS  Article  Google Scholar 

  2. 2

    Simpson, J. F., Bull. geol. Soc. Am., 77, 197–203 (1966).

    Article  Google Scholar 

  3. 3

    Irving, E., and Major, A., Sedimentology, 3, 135–143 (1964).

    ADS  Article  Google Scholar 

  4. 4

    Watkins, N. D., Earth planet. Sci. Lett., 4, 341–349 (1968).

    ADS  Article  Google Scholar 

  5. 5

    Kjellman, W., Kallstenius, T., and Wager, O., Proc. Swed. geothech. Inst., 1, (1950).

  6. 6

    Ising, G., Ark. Mat, Astr. Phys., 29 A, (5), 1–37 (1942).

    Google Scholar 

  7. 7

    Granar, L., Ark. Geofys., 3, (1), 1–34 (1958).

    Google Scholar 

  8. 8

    Johnson, E. A., Murphy, T., and Torreson, O., W, Terr. Magn. atmos. Elect., 53, 349–372 (1948).

    Article  Google Scholar 

  9. 9

    Molyneux, L., Thompson, R., Oldfield, E., and McCallan, M. E., Nature phys. Sci., 237, 42–43 (1972).

    ADS  Article  Google Scholar 

  10. 10

    Mörner, N-A., Sver. geol. Unders. Ath., C 640, 1–487 (1968).

    Google Scholar 

  11. 11

    Molyneux, L., Geophys. J. R. astr. Soc., 24, 429–434 (1971).

    ADS  Article  Google Scholar 

  12. 12

    Tauber, H., in Radiocarbon Variations and Absolute Chronology, (edit. by Olsson), 173–196 (1970).

    Google Scholar 

  13. 13

    Steinhauser, P., and Vincenz, S. A., Earth planet. Sci. Lett., 19, 113–119 (1973).

    ADS  Article  Google Scholar 

  14. 14

    Ransom, C. J., Nature, 242, 518–519 (1973).

    ADS  Article  Google Scholar 

  15. 15

    Bonhommet, N., and Babkine, J., C.r. hebd. Séanc. Acad. Sci., Paris, 264, 92–94 (1967).

    Google Scholar 

  16. 16

    Goldstein, A. S., and Henyey, T. L., Eos., 51, 270 (1970).

    Google Scholar 

  17. 17

    Morner, N-A., Lanser, J. P., and Hospers, J., Nature phys. Sci., 234, 173–174 (1971).

    ADS  Article  Google Scholar 

  18. 18

    Mörner, N-A., and Lanser, J. P., Nature, 251, 408–409 (1974).

    ADS  Article  Google Scholar 

  19. 19

    Creer, K. M., Eos., 55, 224 (1974).

    Google Scholar 

  20. 20

    Denham, C. R., and Cox, A., Earth planet. Sci. Lett., 13, 181–190 (1971).

    ADS  CAS  Article  Google Scholar 

  21. 21

    Mackereth, F. J. H., Earth planet. Sci. Lett., 12, 332–338 (1971).

    ADS  CAS  Article  Google Scholar 

  22. 22

    Liddicoat, J. C., Bull. geol. Soc. Am., 6 (in the press).

  23. 23

    Clark, H. C., and Kennett, J. P., Earth planet. Sci. Lett., 19, 267–274 (1973).

    ADS  Article  Google Scholar 

  24. 24

    Liddicoat, J. C., and Coe, R. S., Eos., 55, 224 (1973).

    Google Scholar 

  25. 25

    Freed, W. K., and Healy, N., Earth planet. Sci. Lett., 24, 99–104 (1974).

    ADS  Article  Google Scholar 

  26. 26

    Kawai, N., Yaskawa, K., Nakajima, T., Torii, M., and Horie, S., Proc. Japan Acad., 48, 186–190 (1972).

    Article  Google Scholar 

  27. 27

    Nakajima, T., Yaskawa, K., Natsuhara, N., and Kawai, N., Nature phys. Sci., 244, 8–10 (1973).

    ADS  Article  Google Scholar 

  28. 28

    Bonhommet, N., and Zahringer, J., Earth planet. Sci. Lett., 6, 43–46 (1969).

    ADS  CAS  Article  Google Scholar 

  29. 29

    Smith, J. D., and Foster, J. H., Science, 163, 565–567 (1969).

    ADS  CAS  Article  Google Scholar 

  30. 30

    Barbetti, M., and McElhinny, M., Nature, 239, 327–330 (1972).

    ADS  CAS  Article  Google Scholar 

  31. 31

    Tarling, D. H., in Palaeogeophysics (edit. by Runcorn, S. K.,) 193–208 (Academic, London, 1970).

    Google Scholar 

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NÖEL, M., TARLING, D. The Laschamp geomagnetic ‘event’. Nature 253, 705–707 (1975). https://doi.org/10.1038/253705a0

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