  With the help of a block parametrization of the canonical seesaw flavor
textures in terms of the Euler-like rotation angles and CP-violaing phases, we
derive a general and explicit expression for the Jarlskog invariant of CP
violation in neutrino oscillations and compare it with the CP-violating
asymmetries of heavy Majorana neutrino decays within the minimal seesaw
framework which contains two right-handed neutrino fields. Two simplified
scenarios are discussed to illustrate how direct or indirect the correlation
between these two types of CP violation can be.
