We will perform researches on (1) structure and dynamics of the Earth's deep interior from geophysical observation mainly in oceanic regions; (2) mantle and core convections based on numerical and laboratory simulations; (3) interactions between the Earth’s surface and deep interior based on geochemical and mineralogical studies. Integrating these researches should enable a better understanding on thermal and mass transports across boundaries in the layered Earth, such as the core-mantle boundary and the Earth's surface, which is indispensable to understand mechanism s of the Earth evolution and dynamics.
We will determine structure and dynamics of the Earth's deep interior from geophysical observation mainly in oceanic regions. Interdisciplinary studies will be emphasized to understand thermal and mass transports in the Earth. Broadband ocean bottom seismographs and ocean bottom electro-magnetometers are used for geophysical observation on seafloor. The target of our research team includes.
Our research team investigates the mantle and the core dynamics separately, and their mutual interactions through the core-mantle boundary based on numerical simulations, laboratory experiments and the observations of the geomagnetic field variations in various time scales. We carried out 3-D mantle convection simulation with realistic earth-like parameters using the Earth Simulator to reveal the basic properties of mantle activities. We also perform geodynamo simulations and the laboratory experiments of thermal convection of liquid metal to investigate the core dynamics and the origin of the Earth's magnetic field. Seafloor observations and paleomagnetic studies on the deep-sea sediment have been continuing to elucidate the feature of the geomagnetic field variations.
Earth Surface and Interior Co-Evolution Research Team: The isotopic compositions of elements such as Os, Pb and C of sediments at the time of global events are measured to unravel the mechanism of environmental change of earth's surface and its relation to large-scale volcanic activities. Volatile contents are estimated through analyses of volatiles in melt inclusion of minerals such as Cr-spinel and also chemical compositions of palaeoseawater are estimated through analyses of fluid inclusions in quartz to clarify the effects of mantle volatiles on the surface environments. Large Igneous Provinces (LIPs) ?derived volcanic rocks and related mantle xenoliths are analyzed petrologically and geochemically to make constraints on the structure of upwelling mantle.