Secular variation of the Late Archean-Early Proterozoic geodynamo

Details Secular variation of the Late Archean-Early Proterozoic geodynamo Secular variation of the Late Archean-Early Proterozoic geodynamo

Aug 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3116607s&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 16, CiteID L16607

Physics

17

Geomagnetism And Paleomagnetism: Paleomagnetic Secular Variation, Geomagnetism And Paleomagnetism: Core Processes (8115), Geomagnetism And Paleomagnetism: Rock And Mineral Magnetism, Geomagnetism And Paleomagnetism: Time Variations-Secular And Long Term, Tectonophysics: Evolution Of The Earth

Scientific paper

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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