Abstract
We report low-temperature magnetic properties of predominantly mafic rocks from the Mesoproterozoic Ropruchey sill, Karelia. Based on microscopic observations, the studied rocks can be classified into two groups, granodiorites and gabbro-diorites, with different magnetic mineralogy. In granodiorites, the only magnetic mineral is stoichiometric magnetite characterized by a Verwey transition temperature of 120–121 K. In gabbro-diorites, the magnetic mineralogy is also dominated by magnetite, which however contains 2–3% of Ti substitution atoms, lowering the Verwey transition temperature to 94–103 K. In addition, the gabbro-diorites appear to contain some amount of a more Ti-rich titanomagnetite, as well as another, yet unidentified magnetic phase, manifesting itself by a peculiar temperature and frequency-dependent behavior of magnetic susceptibility.
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Acknowledgements
The samples for this study were kindly donated by Boris Pisakin. Magnetic measurements were carried out at Kochi Core Center, Kochi University, Japan and supported by the JSPS long-term visiting fellowship to AK. Electron microscopy and X-ray studies have been carried out using the facilities of the St. Petersburg University Scientific Park. This paper has benefited from a review by Karl Fabian.
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Kosterov, A., Sergienko, E.S., Kharitonskii, P.V., Yanson, S.Y., Vasilieva, I.A. (2019). Low-Temperature Magnetic Properties and Magnetic Mineralogy of the Ropruchey Sill (Russian Karelia). In: Nurgaliev, D., Shcherbakov, V., Kosterov, A., Spassov, S. (eds) Recent Advances in Rock Magnetism, Environmental Magnetism and Paleomagnetism. Springer Geophysics. Springer, Cham. https://doi.org/10.1007/978-3-319-90437-5_16
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