Abstract
The purpose of this study is to reveal distribution and stratigraphy of eruptions and to examine the magma plumbing system, the east part of main strato cone, Akita-Komagatake volcano. Eruptions were divided into 20, and erupted from two craters located north and south. In addition, eruptions from the south crater were classified 2 groups and from the north were classified 5 groups by the period of eruption, petrography, and whole rock major-element chemistry. The examination of the magma plumbing system is as follows: First, tholeiite basaltic magma flowed from the south and north craters. Next, Calc-alkari andesitic magma erupted from the north. Then tholeiite basaltic magma flowed once more, after magma that has the feature of between tholeiitic and Calc-alkaric erupted from the north.
