Physics
Scientific paper
May 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987pepi...45..337l&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 45, Issue 4, p. 337-348.
Physics
6
Scientific paper
Anomalous single component palaeomagnetic directions in laminated clay-silt sediments in the non-karstic Skjonghelleren cave, W. Norway, are interpreted to record two high-resolution, but incomplete records of geomagnetic field excursions. A depositional, non-distorted origin of magnetization, carried by ultra-fine magnetite/maghemite grains, has been inferred from field evidence, redeposition experiments and magnetic fabric properties. The sediments deposited sub-glacially between 56 ka to 12 ka, determined by consistent isotope ages obtained from bones and travertine. The youngest excursion (< 30 ka), defined by two equatorial anticlockwise VGP loops, are readily correlated with one of the synchrone Lake Mungo VGP positions, suggesting a phase of global instability of the geomagnetic field. Meridionally constrained, low-latitudinal VGP paths for the oldest excursion (< 56 ka), have features consistent with transitional field geometries, suggesting an aborted reversal origin of this event.
Løvlie Reidar
Sandnes Arne
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