S (Solid Earth Sciences ) » S-CG Complex & General
[S-CG71] Volcanic roots
convener:Naofumi Aso(Tokyo Institute of Technology), Tsuyoshi Iizuka(University of Tokyo), Shuhei Sakata(Earthquake Research Institute, The University of Tokyo), Yohei Yukutake(Hot Springs Research Institute of Kanagawa Prefecture)
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. As seismological evidence, deep long-period earthquakes around the Moho beneath active volcanoes are interpreted to relate to the magma transport system. It is therefore essential to investigate seismicity with a high-resolution hypocenter distribution and focal mechanisms of deep long-period earthquakes. 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. We welcome studies to understand volcanic roots from a variety of approaches including but not limited to the methods mentioned above.
[SCG71-02] Magma supply from lower crust to surface volcano inferred from activities of deep low-frequency earthquakes
[SCG71-06] Ultra-high-pressure internally heated pressure vessels for research on deep magmatic systems
*Akihiko Tomiya1, Toshihiro Suzuki1, Masashi Ushioda1, Takayuki Nakatani1, Isoji Miyagi1, Akiko Tanaka1 (1.Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology)