Physics
Scientific paper
Aug 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000georl..27.2409d&link_type=abstract
Geophysical Research Letters, Volume 27, Issue 16, p. 2409-2412
Physics
8
Geomagnetism And Paleomagnetism: Magnetic Fabrics And Anisotropy, Geomagnetism And Paleomagnetism: Rock And Mineral Magnetism
Scientific paper
In a case study on titanomagnetite-bearing rocks from the Riedheim dike of (Hegau volcanics, SW-Germany), samples of varying composition (Curie temperatures of 128 to 440°C) have been tested for their ac field-dependence of low-field susceptibility. The measurements were performed in ac fields of 30 and 300 A/m. In order to quantify the field-dependency of titanomagnetites, the parameter χHd[%]=[(χ300A/m-χ30A/m)/χ300A/m]×100 is introduced, which ranges from 4.1 to 26.5. A liear relationship has been determined between the Curie temperature of the titanomagnetites and the logχHd parameter. The anisotropy factor (P') of the anisotropy of magnetic susceptibility (AMS) ellipsoid is significantly enhanced in the higher ac field, while the shape factor (T) appears to be insensitive to the field amplitude. However, despite these variations, the principal axes of the AMS-ellipsoids remain unchanged in orientation.
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