Paleomagnetic evidence for the existence of the geomagnetic field 3.5 Ga Ago

Details Paleomagnetic evidence for the existence of the geomagnetic field 3.5 Ga Ago Paleomagnetic evidence for the existence of the geomagnetic field 3.5 Ga Ago

Jul 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980jgr....85.3523m&link_type=abstract

Journal of Geophysical Research, Volume 85, Issue B7, p. 3523-3528

Physics

24

Scientific paper

A paleomagnetic study has been made of the red dacite and pillow basalt of the Duffer Formation of the Pibara craton, Australia. The dacite is currently the oldest dated rock unit in Australia, having a zircon U-Pb age of 3452+/-16 Ma. Vector analysis of alternating field and thermal demagnetization results yield three components of magnetization. The high-temperature, high-coercivity hematite (H) component in the red dacite appears to be postfolding in age, as does a low-temperature, low-coercivity (L) component observed in the pillow basalt. However, an intermediate-temperature, intermediate-coercivity magnetite (M) component observed in both the pillow balalt (five sites) and the red dacite (six sites) is clearly prefolding in age and thus older than 3.0 Ga. This M component appears to be the oldest magnetization yet recorded in paleomagnetic studies and yields a paleomagnetic pole, probably original, at 43.9°N, 86.3°E (A95=7.2°). A tentative Archean apparent polar wander path for Australia suggests that the L and H components are also ancient magnetizations, probably 3.0 and 2.6 Ga old, respectively. The primary M component establishes the existence of the geomagnetic field at least 3.5 Ga ago.

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