Physics
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28.2687t&link_type=abstract
Geophysical Research Letters, Volume 28, Issue 14, p. 2687-2690
Physics
3
Geomagnetism And Paleomagnetism: Magnetic Fabrics And Anisotropy, Geomagnetism And Paleomagnetism: Magnetic Mineralogy And Petrology, Geomagnetism And Paleomagnetism: Rock And Mineral Magnetism, Geomagnetism And Paleomagnetism: Instruments And Techniques
Scientific paper
The thermally induced growth of mimetic magnetite after biotite is here demonstrated by the equivalence of anisotropies of magnetic susceptibility (AMS) and anhysteretic remanence (AAR) after heating of biotite single crystals and whole rock specimens from a magnetite-free granite (Elba Island, Italy). It is concluded that between 500° and 725°C magnetite nucleates and grows within and parallel to the biotite cleavages yielding a magnetic fabric mimetic of the biotite fabric. At higher temperatures magnetite undergoes partial haematization, accounting for the decrease in remanence, susceptibility and anisotropy degree. This experiment may be used as a proxy for fabric study of granites having composite (tourmaline+biotite) paramagnetic fabrics in which the fabric of biotite can be selectively thermally enhanced.
Bouchez Jean Luc
Mi Nguema Mintsa T.
Trindade Ricardo I. F.
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