Библиотека

Grishchenko V.A., Guzhikov A.Yu. (2019) Paleomagnetic Directions Distortion Caused by Viscous-Plastic Deformations Estimated from Anisotropy of Magnetic Susceptibility (Case Study of Berriasian Clays from East Crimea) // In: Nurgaliev D., Shcherbakov V., Kosterov A., Spassov S. (eds) Recent Advances in Rock Magnetism, Environmental Magnetism and Paleomagnetism. Springer Geophysics. Springer, Cham. P. 25-35.

Deformations inside clayey strata may result in a mechanical rotation of ferromagnetic particles and of associated paleomagnetic vectors. Accordingly, restoring the orientation of magnetic susceptibility (AMS) ellipsoids to the position corresponding to the moment of magnetization fixation would be expected to improve the paleomagnetic statistics. The Upper Berriasian clays from Zavodskaya Balka section in the vicinity of Feodosiya was chosen to test this hypothesis. Paleomagnetic quality parameters in the examined rocks improved after the restoring the AMS ellipsoids into their positions at the moment of magnetization acquisition. The reversal test, negative when the original paleomagnetic directions were considered, became positive at the B level (McFadden and McElhinny 1990) after this procedure. Fold test also used to be negative, after the correction revealed a synfolding component throughout the entire section. Thus, our results validate the hypothesis on the possibility of correcting paleomagnetic data by means of the data on anisotropy of magnetic susceptibility. Nevertheless, the technique we have tested requires further elaboration and verification at other objects composed of argillaceous deposits.

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