Rheological properties (e.g., flow behaviors and elastic properties) of minerals and rocks

Left: Shear deformation of a single-crystal of orthopyroxene (opx) and olivine polycrystalline (ol). See [8] for details.
Right: Creep strength of orthopyroxene and olivine under lithospheric conditions. See [8] for details.

Left: (a, b) Microstructures of deformed olivine aggregates (in simple shear style) and (c) a typical dislocation microstructure.
Right: Crystallographic preferred orientation of anhydrous olivine at high pressures (2.1-7.6 GPa) and 1493 K. See [9] for details.

Grain growth of minerals

Left: Grain growth of forsterite (50 vol.%) + diopside (50 vol.%) wehrlite under water-saturated conditions (1.2 GPa and 1473 K).
Right: Grain growth of forsterite (80 vol.%) + diopside (20 vol.%) wehrlite under water-saturated conditions (1.2 GPa and 1473 K). See [4] for details.

Diffusion of elements in fluid-bearing

Left: Aqueous fluid distribution in wehrlite (i.e., forsterite-clinopyroxene bimineralic rock) at 1.2 GPa and 1473 K. G: pore fluids surrounded by a single mineral phase; I: pore fluids surrounded by two different mineral phases.
Right: Time-dependency of pore fluid distribution in wehrlites with various forsterite/clinopyroxene ratios. Square: 1.5 h; triangle: 58 h; circle: 160-163 h. See [1] for details.

Developments of experimental techniques

(a,b) Chemical etching techniques of bi- and poly-mineralic rocks. (c,d) A Griggs-type apparatus and a design of cell assembly (CsCl-type). (e,f) An experimental setup for deformation experiments using a D-DIA apparatus. See [2], [6], [8] for details.

►Acoustic emission monitoring at high pressures

Left: SPring-8 BL04B1 beamline and the AE monitoring system
Right: A deformation-DIA apparatus installed at BL04B1

Upper: The AE monitoring system (collaborated with Dr. X. Lei)
Lower: Example of AE waveforms monitored with 6 recievers.

►TEM observations

a-c) Dislocations and stacking faults in a deformed ringwoodite sample.
d) Ultrafine-grained olivine forming a gouge layer in a deformed/fractured dunite sample.
e) an amorphos phase (upper part) associated with a olivine grain (lower part) in a gouge layer in a deformed/fractured dunite sample.


►Deformation experiments under the conditions of the Earth’s mantle using a deformation-DIA apparatus combined with MA 6-6 system (and a Griggs-type apparatus).

►”In-situ” deformation experiments and AE monitoring at a synchrotron facility.

►Grain growth experiments, diffusion experiments, and hot-press experiments using a Kaway-type multianvil apparatus (a piston-cylinder apparatus).

►Analysis of crystallographic preferred orientation of minerals using the electron backscattered diffraction (EBSD) patterns.

►Observations of microstructures of rocks and dislocations in minerals and chemical analysis of minerals by using a SEM/FE-SEM and a EPMA.

►Observations of nanometer-scale structures using a ATEM.

►Water content analysis by using a FT-IR.

►Preparation of starting materials using the Sol-Gel technique

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