Magnetic anisotropy of granitic rocks of the Bergell massif (Switzerland)

Details Magnetic anisotropy of granitic rocks of the Bergell massif (Switzerland) Magnetic anisotropy of granitic rocks of the Bergell massif (Switzerland)

Oct 1973

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973e%26psl..20..180h&link_type=abstract

Earth and Planetary Science Letters, Volume 20, Issue 2, p. 180-188.

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Scientific paper

Magnetite as well as ilmenohematite are contained by the Bergell granitic rocks, but the fabric of low field susceptibility is due to the magnetite only and is equivalent to the macroscopic biotite fabric. Microscopic observations and high field anisotropy measurements show that the ilmenohematite trigonal axes are aligned parallel to the directions of minimum low field susceptibility anisotropy. The deflection of the stable direction of natural remanent magnetization caused by the alignment of ilmenohematite is corrected using the susceptibility anisotropy data. The resulting virtual palaeopole position deviates from other Oligocene to Miocene pole positions of stable Europe suggesting that since the time of intrusion some 25 my ago the Bergell massif has been rotated anti-clockwise by an angle of ~30° about a vertical axis. Contribution Nr. 75, Institut für Geophysik, ETH Zürich.

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