Isotopic Composition for Helium in Late Cenozoic South-Baikal and South-Khangai Volcanic Areas

Abstract

The paper considers isotopic composition of helium (3Не/4Не = R) in groundwater of South-Baikal (SBVA) and South-Khangai volcanic areas (SKhVA) during the Late Cenozoic period. The differences in the behavior and magnitude of the parameters were established. It is found that the mentioned differences in 3Не/4Не concentrations within South-Baikal and South-Khangai volcanic areas correspond to mantle reservoirs with different helium isotope compositions. This confirms that the Late Cenozoic volcanism of South-Baikal and South-Khangai volcanic area is controlled by mantle sources related to mantle plumes of the Central-Asian hot mantle field.