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Tauxe, L., Staudigel, H. and Wijbrans, J.R. (2000). Paleomagnetism and $^{40}$Ar/$^{39}$Ar ages from La Palma in the Canary Islands. Geochemistry Geophysics Geosystems 1. doi: 10.1029/2000GC000063. issn: 1525-2027. |
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The structure of the time-averaged geomagnetic field has been known for centuries to be approximately dipolar. Significant departures of the time-averaged field from that of an axial geocentric dipole, however, have been reported for decades. The data on which time-averaged field models are based must be of the highest quality in order to document subtle long-term features. We present here new paleomagnetic data and 40Ar/39Ar ages for the island of La Palma, The Canary Islands. Paleomagnetic samples were obtained from 28 lava flows. Of these, 21 met our minimum acceptance criteria for use in time-averaged field models. The 40Ar/39Ar age determinations were successfully carried out on samples from eight of the flows. Our isotopic ages and paleomagnetic polarities are consistent with the currently accepted geomagnetic reversal timescales. The reversed data in the updated database are antipodal to the normal data within the uncertainties, and the time-averaged direction is indistinguishable from that expected from a geocentric axial dipole. |
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Abstract |
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Keywords
Geomagnetism and Paleomagnetism, Reference fields (regional, global), Geomagnetism and Paleomagnetism, Paleomagnetic secular variation, Geomagnetism and Paleomagnetism, Time variations—secular and long term, Atmospheric Composition and Structure, General or miscellaneous |
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Journal
Geochemistry Geophysics Geosystems |
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Publisher
American Geophysical Union
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