Parallel magnetic fabrics in metamorphic, granitoid and sedimentary rocks of the Branisko and Čierna hora Mountains (E Slovakia) and their tectonometamorphic control

Magnetic fabric of granitic composite pluton of the Velká Fatra Mountains (Western Carpathians, Slovakia): A Variscan remnant within the Alpine edifice?

“…In the Veporic Superunit of the Western Carpathians and in some Core Mountains of the Tatric Superunit, the magnetic fabrics show similar patterns in metamorphic, granitic and covering sedimentary rocks (Hrouda et al, 1988;Hrouda and Kahan, 1991;Hrouda et al, 2002). These similar patterns in rocks differing both in lithology and age imply similar origins for their magnetic fabrics.…”

“…Deformational magnetic fabrics f) relatively high degree of AMS, typically P > 1.2, g) close relationship of the magnetic foliations and lineations to the deformational mesoscopic foliations (e.g. cataclastic schistosity) and lineations, if observable (Hrouda et al, 1988), h) if the magmatic body contains dikes, the magnetic fabric in dikes is unrelated to the dike shape, showing similar orientation to the magnetic fabric in the host body (Henry, 1980), i) if there are several granitic bodies in a massif, the magnetic fabrics in individual bodies show similar patterns, j) if the granitic rocks are covered by sedimentary rocks that have deformational magnetic fabrics, the magnetic fabrics patterns in granites and sediments are similar (Hrouda et al, 1988. In addition to the above two cases, the third one can exist, i.e.…”

“…1). In some Core Mountains, for example the Branisko and Čierna Hora Mountains (Hrouda et al, 1988), High Tatra Mountains (Hrouda and Kahan, 1991), Veporské vrchy Mountains , the magnetic fabric is deformational in origin, showing similar patterns in metamorphic, granitic and sedimentary cover rocks within each Core Mountains, but different orientations between the Core Mountains. This magnetic fabric is regarded as resulting from ductile deformation associated with regional metamorphism operating during Alpine Upper Cretaceous major crustal scale collision between the main crustal units of the Central West Carpathians (including formation and motion of the Central West Carpathian nappes) (Biely and Hrouda, 1992;Grabowski, 1996;Gregor et al, 1992a, b;Hrouda and Vozár, 1995;Hrouda et al, 2002).…”

Separation of paramagnetic and ferrimagnetic anisotropies: A review

“…The AMS was originally proposed by Graham [1954] as a useful fabric element. It has since become widely used in deformation studies because the AMS ellipsoid often correlates with the strain ellipsoid [e.g., Hrouda et al , 1988; Rochette et al , 1992; Borradaile and Henry , 1997]. The measurement procedures to determined the AMS ellipsoid are described by Collinson et al [1967] and Tarling and Hrouda [1993].The contribution of each mineral species to the AMS of the rock depends on the mineral abundance, on the orientation of the grains (shape fabric) and also on the intrinsic magnetic anisotropy of the mineral grains.…”

Assumed Neogene deformation in the Central Western Carpathians as inferred from magnetic anisotropy investigations

“…The Central Western Carpathians, unlike to the Alps and other mountain chains, do not create a continuous mountain range, but crop out in several inliers as the so-called Core Mountains within the mostly unfolded Central Carpathian Palaeogene and Neogene basins. In some Core Moun-Correspondence to: F. Hrouda (agico@agico.cz) tains, for example the Branisko andČierna Hora Mountains (Hrouda et al, 1988), Tatry Mountains (Hrouda and Kahan, 1991), Veporské vrchy Mountains (Hrouda et al, 2002), the magnetic fabric is deformational in origin, showing similar patterns in metamorphic, granitic and covering sedimentary rocks within each Core Mountains, but different orientations between the Core Mountains. This magnetic fabric is regarded as resulting from Alpine ductile deformation associated with metamorphism during Upper Cretaceous formation and motion of the Central West Carpathian nappes (Biely and Hrouda, 1992;Grabowski, 1996;Gregor et al, 1992a, b;Hrouda and Vozár, 1995;Hrouda et al, 2002) which strongly overprinted the older magnetic fabrics in all rock types.…”