Geochemistry and Mineralogy Research Group

At the Geochemistry and Mineralogy Research Group, we aim to elucidate material cycles and environmental changes from the Earth’s surface to its deep interior by decoding the chemical and mineralogical information preserved in geomaterials, including drilling core samples. To achieve this goal, we employ a wide range of analytical techniques, such as trace element and isotope analyses, microstructural observations, and molecular- and crystal-structure analyses. We have also established an integrated analytical platform that combines state-of-the-art ultrahigh precision analysis, microanalysis, and microspectroscopy, and we continue to improve this system. This analytical infrastructure is applicable to a broad spectrum of material science and is particularly powerful for the analysis of rare and extremely small samples. For example, it enables innovative studies on the behavior of volatile components in the Earth’s interior, the mechanisms of earthquake generation, the metabolic functions of life in the deep subseafloor, and the physicochemical evolution of extraterrestrial materials.

• High-precision isotopic ratio measurement at low concentrations
• Elucidation of dramatic environmental events recorded in sediments
• Origin of fluids and fluid-rock interactions in subduction zones
• Effects of volatiles on dynamic processes at LAB (base of the plate) in oceanic, continental, and arc settings
• Investigation of the origin and behaviors of Earth’s water based on the isotopic compositions of terrestrial and extraterrestrial materials
• Phase transformations and deformation of minerals under high pressures and temperatures
• Data-driven planetary materials science: a paradigm shift in understanding Solar System material evolution via multimodal and Data Integration