TY JOUR TI Helium isotopes in the Baikal rift underground fluids and its framing to the geodynamics of continental rift genesis KW Helium isotopes KW Baikal rift KW underground fluids KW continental rift genesis KW MORB. JO Russian Journal of Earth Sciences AU Polyak, B.G. PY 2000 IS 2 PB Geophysical Center of the Russian Academy of Sciences