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Detailed Reference Information |
Smirnov, A.V. and Tarduno, J.A. (2004). Secular variation of the Late Archean–Early Proterozoic geodynamo. Geophysical Research Letters 31: doi: 10.1029/2004GL020333. issn: 0094-8276. |
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We report new paleomagnetic data from ~2.5 Ga dikes of the Superior Province and derive estimates of paleosecular variation. When combined with data from coeval dikes of the Karelia Craton (Russia) and older (~2.7 Ga) volcanics of the Pilbara Craton, these estimates suggest a latitudinal variation of secular variation similar to that of the last 5 million years, but with potentially smaller quadrupole family contributions. The observations are consistent with some numerical models of the field that suggest a more dipolar field when the Earth had a much smaller solid inner core. |
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Abstract |
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Keywords
Geomagnetism and Paleomagnetism, Paleomagnetic secular variation, Geomagnetism and Paleomagnetism, Core processes, Geomagnetism and Paleomagnetism, Rock and mineral magnetism, Geomagnetism and Paleomagnetism, Time variations—secular and long term, Tectonophysics, Evolution of the Earth |
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Publisher
American Geophysical Union 2000 Florida Avenue N.W. Washington, D.C. 20009-1277 USA 1-202-462-6900 1-202-328-0566 service@agu.org |
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