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Shibuya et al. 1992

Shibuya, H., Cassidy, J., Smith, I.E.M. and Itaya, T. (1992). A Geomagnetic Excursion in the Brunhes Epoch Recorded in New-Zealand Basalts. Earth and Planetary Science Letters 111(1): 41-48. doi: 10.1016/0012-821X(92)90167-T.

Anomalous geomagnetic directions are recorded in the thermoremanent magnetisation (TRM) of alkali basalt lavas from the Auckland volcanic field, New Zealand. The concordance of paleomagnetic directions both in different sites from individual eruptive centres and in sites from several different centres, as well as their relatively short age span compared with that of the field as a whole, indicates that these anomalous directions have a geomagnetic origin. The directions, which are dated between approximately 25 ka and 50 ka, do not represent full reversals of the geomagnetic field and are interpreted as excursions. Very few excursions have been reported from the Southern Hemisphere; this is the first such record known from igneous rocks and further supports the notion that excursions are global phenomena. The excursions here are tentatively correlated with those reported from Lake Mungo, Mono Lake and Laschamp.

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Keywords
laschamp excursion

Journal
Earth and Planetary Science Letters
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Publisher
Elsevier Science
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