Journal : Acta Geologica Polonica
Article : Synthrusting remagnetization of the Krizna nappe: high resolution palaeo- and rock magnetic study in the Strazovce section, Strazovske vrchy Mts, Central West Carpathians (Slovakia)

Authors :
Grabowski, J.
Polish Geological Institute, Rakowiecka 4, 00-975 Warszawa, Poland,,
Abstract : Palaeomagnetic studies of the uppermost Jurassic to lower Cretaceous pelagic carbonates in the Krizna nappe in the Strazovske vrchy Mts (Central West Carpathians, Slovakia) revealed the presence of secondary magnetite-related magnetization of exclusively normal polarity (component B), which was most probably acquired during the thrusting episode in the late Cretaceous. Three formations exposed in the Strazovce section were the subject of investigation: Jasenina Kimmeridgian.Tithonian), Osnica (Lower.Middle Berriasian) and Mraznica (Upper Berriasian.Hauterivian). Component B is ubiquitous throughout the section but is strongest in the Mraznica Formation. This formation contains a lot of superparamagnetic particles and shows rock magnetic characteristics typical of chemically remagnetized carbonates. The remaining two formations, although also remagnetized, bear traces of an older, probably primary magnetization (component C). The fold test for component B is apparently positive; however the inclination in pre-folding coordinates is too steep for any expected palaeoinclination of Jurassic to recent age. Additional tectonic correction must be applied to match the palaeoinclinations with expected values. Although there is some uncertainty in this additional correction, all plausible options suggest that the rocks must have been magnetized when they dipped in the opposite direction to the thrusting direction. This interpretation is concordant with the internal tectonics of the Krizna nappe, consisting of imbricated units of duplex-type structure.

Keywords : Góry Strażowskie, Karpaty, mezozoik, paleomagnetyzm, Słowacja, węglany, Carbonates, Carpathians, Mesozoic, Palaeomagnetism, Remagnetization, Slovakia, Strazovske vrchy Mts.,
Publishing house : Faculty of Geology of the University of Warsaw
Publication date : 2009
Number : Vol. 59, no. 2
Page : 137 – 155

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Qute : Grabowski, J. ,Grabowski, J. , Synthrusting remagnetization of the Krizna nappe: high resolution palaeo- and rock magnetic study in the Strazovce section, Strazovske vrchy Mts, Central West Carpathians (Slovakia). Acta Geologica Polonica Vol. 59, no. 2/2009