High resolution analysis of evolution of magma chambers in island arc andesitic volcano - an example of Zao volcano past 2,000 years -

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Revealing the evolution of magma chamber is one ofthe main subjects in the field of igneous petrology. Advance of petrologic technique allows us to solve this subject with a high resolution. Detailed petrologic studies on recent eruption events of volcanoes have revealed that the feeding system beneath island arc volcanoes fundamentally comprises shallower felsic and deeper mafic magma chamber. Sometimes, eruptions are triggered by the injection of mafic magmas into shallower chambers. Detailed studies of single or series of eruptive events have revealed there are several patterns of the chamber processes that result from the injections. The magma evolution course in the past ca. 2,000 years in Zao volcano, NE Japan was examined in this study. The results is also important in predicting future eruptions.