“…The study of the magnetic properties of these rocks began in the 1970s [Tretyak, Volok, 1976;Tretyak, 1980Tretyak, , 1983Tretyak et al, 1987Tretyak et al, , 1989Tretyak, Vigilyanskaya, 1994] and have been continued during the last 20 years [Vigilyanskaya, Tretyak, 2001Bakhmutov et al, 2005Bakhmutov et al, , 2017Bakhmutov, Hlavatskyi, 2014;Bakhmutov, Glavatskіy, 2016;Hlavatskyi et al, 2016a,b;Hlavatskyi, 2019;Hlavatskyi, Bakhmutov, 2019, 2020Nawrocki et al, 1999Nawrocki et al, , 2002Nawrocki et al, , 2016Gendler Fig. 1.…”