Abstract
The progressive development of planar and linear fabrics due to Alpine deformation in Dogger calcareous shales has been studied in the Dauphinois zone of the French Alps, using measurements of the anisotropy of magnetic susceptibility. The axes and shapes of magnetic ellipsoids and petrofabrics show good qualitative correlation through a series of different fabric types from a sedimentary to a highly deformed one. Together with various petrological techniques, magnetization measurements in a variable field (up to 5 T) and under variable temperature with a cryogenic magnetometer, were used to achieve a complete analysis of the magnetic mineralogy with its dia-, para- and ferromagnetic ( s.l.) contributions. The effects on the anisotropy of the complex mineralogy and various geological processes including pressure-solution, metamorphism and weathering, are discussed.
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