Fri. Jun 4, 2021 5:15 PM - 6:30 PM Ch.17

convener:Naofumi Aso(Tokyo Institute of Technology), Tsuyoshi Iizuka(University of Tokyo), Yohei Yukutake(Earthquake Research Institute, University of Tokyo)

The magma transport system beneath volcanoes is a key to understand geodynamics and the evolution of the Earth. To understand the deep volcanic roots around the lower crust, including deep magma chambers, we need to integrate studies based on various approaches. For example, deep long-period earthquakes around the Moho beneath active volcanoes are interpreted to relate to magma, and therefore, it is important to investigate their seismicity and focal mechanisms. Physical understanding of these events will guide us to reveal the role of deep long-period earthquakes in the magma transport system. Also, high-resolution seismic or electrical resistivity imaging is essential to understand physical properties at the depths and to visualize the magma transport system. Besides, the petrological and geochemical properties of igneous rocks provide important information on the origin of magma and its evolutionary processes including fractional crystallization, assimilation, and mixing at the deeper part of the crust. In particular, microscale chemical and isotopic analyses of minerals with compositional zoning provide important constraints on the evolution of magma chambers. Also, experimental studies under the pressure and temperature conditions at the mantle wedge are essential for understanding magma generation. We welcome studies to understand volcanic roots from a variety of approaches including but not limited to the methods mentioned above.