TY JOUR TI Continuous record of geomagnetic field variations during cooling of the Monchegorsk, Kivakka and Bushveld Early Proterozoic layered intrusions KW geomagnetic field variations KW layered intrusions KW titanomagnetites KW petromagnetic characteristics KW Monchegorsk. JO Russian Journal of Earth Sciences AU Pechersky, D.M. AU Zakharov, V.S. AU Lyubushin, A.A. PY 2004 IS 6 PB Geophysical Center of the Russian Academy of Sciences