Physics
Scientific paper
Nov 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20.2399b&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 21, p. 2399-2402
Physics
30
Geodynamics, Geomagnetism, Magnetic Flux, Paleomagnetism, Dynamo Theory, Hawaii, Magnetic Dipoles, Polarity, Stratigraphy, Volcanoes
Scientific paper
The paleomagnetism of lava flows from Kauai (Hawaii), erupted about 4 my ago immediately following a geomagnetic reversal, reveals that the post-transitional field had several distinctive characteristics. While the directional dispersion was identical to that displayed by stable field over the past 5 my, the post-transitional field intensity was unusually high. In both these respects, the field at Kauai resembles the one recorded at 15 Ma by lava flows at Steens Mountain in SE Oregon. The two records also differ in an important way: the large intensity oscillations that immediately followed the Steens Mountain reversal are not apparent in the data from Kauai. These results suggest that while the stability of the newly established dipole may vary significantly from one reversal to the next, strong dipolar field and normal directional dispersion may be systematic features of the post-transitional geodynamo. Furthermore, the results lend support to the recent suggestion that the core remains in an unusual state for many tens of kyr following a reversal.
Bogue Scott W.
Paul Hilary A.
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