Mantle-derived Xenoliths with Hot-spot Type Helium in Cenozoic Alkali Basalt, Northwestern Kyushu, Japan
H. Sumino, K. Nagao, K. Notsu and S. Nakai
Laboratory for Earthquake Chemistry, University of Tokyo, Tokyo, 113-0033, Japan
Earthquake Research Institute, University of Tokyo, Tokyo, 113-0032, Japan