TY JOUR TI Helium isotopes in the ground fluids of the Baikal Rift and its surroundings: Contribution to continental rifting geodynamics KW Helium isotopes KW ground fluids KW Baikal Rift Zone KW rifting geodynamics. JO Russian Journal of Earth Sciences AU Polyak, B.G. PY 2003 IS 5 PB Geophysical Center of the Russian Academy of Sciences