島根県大田市五十猛地区の安山岩に含まれる斑れい岩質包有岩

Present author recently found gabbroic inclusion in the Miocene andesite from Isotake, Ooda city, in western most district of San'in-Hokuriku green tuff subregion of Japan.
Needless to say, it is important problem in petrogenesis to know of what materials, not only the upper mantle but also the basement of the crust, are composed.
At least some of the upper mantle must be able to yield igneous magma by partial melting ; it is not clear, however, to what depths the upper mantle must meet this requrrement.
To consider these problem the study on the inclusion that the upper mantle or basement of the crust must provide a source are well worth performing, because it may provide some important knowledges on the mantle, basement of crust and origin of igneous magma.