Computer Science
Scientific paper
Aug 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994e%26psl.126..171b&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 126, no. 1-3, p. 171-182
Computer Science
16
Crystal Defects, Crystals, Earth (Planet), Geomagnetism, Inclusions, Magnetic Fields, Magnetite, Paleomagnetism, Anisotropy, Crystal Structure, Crystallography, Igneous Rocks, Metamorphic Rocks, Minerals
Scientific paper
Randomly oriented phlogopite crystals from a pegmatite contain submicroscopic inclusions of magnetite. The inclusions have oblate magnetic fabrics, subparallel to the ab crystal plane. Alternating field demagnetization of individual crystals shows that the remanence is influenced by the crystal symmetry of the phlogopite host. The magnetizations isolated by alternating field demagnetization either cluster close to the a-axis or scatter in the ab plane. Coarse-grained igneous and metamorphic rocks can only record a paleofield direction accurately if there is a suitable orientation distribution of the rock-forming minerals that host the ferromagnets. An isotropic distribution of rock-forming minerals is preferable but it is not obligatory. Rock-forming minerals that have L-fabrics or S-fabrics with a strong L-component are also suitable if they contain oblate inclusion fabrics of ferromagnets.
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