Magnetic fabric in the Biella and Traversella stocks (Periadriatic Line) : implications for the mode of emplacement

Details Magnetic fabric in the Biella and Traversella stocks (Periadriatic Line) : implications for the mode of emplacement Magnetic fabric in the Biella and Traversella stocks (Periadriatic Line) : implications for the mode of emplacement

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989pepi...56..337h&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 56, Issue 3-4, p. 337-348.

Physics

15

Scientific paper

The Biella and Traversella stocks, forming part of the intrusions along the Periadriatic Line, intruded into the Sesia-Lanzo Zone (Italian western Alps) ~ 30 Ma ago.
Samples were collected from 12 localities in the Traversella massif (diorites) and 22 in the Biella massif (granites, syenites, monzonites). In most localities, the fabric is primarily planar, with a distinct foliation of intermediate to subvertical dip. The magnetic lineation is less developed. Its plunge is very variable, marking a girdle pattern. The mean foliations and lineations per locality are scattered. This is probably due to the fact that the outcropping parts of the two stocks are summital, i.e. nearer the roof, and hence the magma movements may have been less regular. In the structurally deepest part of the Biella massif, the magnetic foliation dips regularly to the northwest. Its direction could reflect the pattern of the deep fractures along which the magma rose.
The classic models of Owens, to describe the process of magnetic mineral orientation, do not apply to the features of these two stocks. A new model has been constructed to take account of the differences in viscosity contrast between the magnetic mineral crystals and the matrix. Referred to as the ductile model, it offers a suitable representation of the typical situation of crystal mushes and is the most appropriate for the Biella and Traversella stocks.

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