The Itinome-gata volcano is a part of this
volcanic zone of northeastern Japan( Fig. l). Total
FeO, MgO and CaO decrease gradually from basalt
to salic andesite while Na2O and K2O increase, and
it is noticeable that the basalt-andesite suite of the
Itinome-gata district is clearly higher in MgO and
KzO and lower in total FeO and Na2O than the
average curves.