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Field mapping of magnetic susceptibility as tool for petrographic characterization of granitoids – a key study in the Hauzenberg pluton, Bavarian Forest, Germany

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Abstract:

In the Hauzenberger pluton of East Bavaria two granites, (Hauz I and II) and a granodiorite are distinguished. Their magnetic susceptibility, measured in the field using a portable susceptometer, is low, but clear differences appear between the granodiorite (84 × 10−6 SI) and both granite types (52 × 10−6 SI). These differences are related to the variable content in biotite and muscovite. Based on systematic magnetic susceptibility measurement at 372 sites, a susceptibility contour map of the Hauzenberg pluton was drawn. There is a good agreement between the spatial distribution of the different lithotypes of the pluton and the areas of iso-susceptibility values. Susceptibility measurements on rock-floats can be considered as reliable in the frame of the contoured susceptibility map, thus allowing the implementation of float data sets into the magnetic susceptibility mapping routine.

Document Type: Research Article

DOI: http://dx.doi.org/10.1127/0077-7749/2008/0248-0129

Publication date: May 1, 2008

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