  Leptonic CP violation is one of the most important topics in neutrino
physics. CP violation in the neutrino sector is strongly related to the nature
of neutrinos: whether they are Dirac or Majorana particles. In
\cite{Popov:2021icg} we have shown that for Majorana neutrinos appearance of
nonzero Majorana CP-violating phases combined with strong magnetic field during
supernova core-collapse can induce new resonances in neutrino oscillations, for
example in $\nu_e \to \bar{\nu}_\tau$ channel. In this paper we further study
new resonances in Majorana neutrino oscillations, in particular energy
dependence of amplitudes of resonant oscillations. Our findings suggest a
potential astrophysical setup for studying the nature of neutrino masses and
leptonic CP violation and may be important for future neutrino experiments,
such as JUNO, Hyper-Kamiokande and DUNE.
