Computer Science
Scientific paper
Sep 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994e%26psl.126..217r&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 126, no. 4, p. 217-234
Computer Science
14
Biotite, Himalayas, Magnetic Measurement, Magnetic Permeability, Massifs, Mineralogy, Remanence, Anisotropy, Granite, Tectonics
Scientific paper
The magnetic properties of the High Himalayan leucogranites have been investigated on 527 specimens in three plutons, Everest-Makalu (6 sites) and Manaslu (40 sites) in Nepal, and Gangotri (43 sites) in India. Susceptibility varies between 2 and 100 x 10(exp -6) SI, with an anisotropy ratio up to 1.16. High field and low-temperature magnetic measurements together with comparisons with weight percent iron demonstrate that anisotropy of magnetic susceptibility is carried by paramagnetic biotite and tourmaline. The latter produces an inverse fabric, i.e. with the minimum axis parallel to mineral lineation. The magnetic fabric demonstrates complex patterns of stretching lineations during magmatic emplacement, and its usefulness in semi-quantitatively estimating petrofabric intensity is demonstrated for the biotite-bearing facies. Natural remanent magnetization was measurable at only two sites in Everest-Makalu, where there are well-defined reverse directions carries by titanomagnetite and pyrrhotite. Comparison of these preliminary results with predicted directions for stable India suggests northward tilting of about 10 deg and a small clockwise rotation of this massif.
Guillot Stéphane
Le Fort Patrick
Pêcher Arnaud
Rochette Pierre
Scaillet Bruno
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