Japan Geoscience Union Meeting 2015

Presentation information


Symbol S (Solid Earth Sciences) » S-CG Complex & General

[S-CG59] Rheology, fracture and friction in Earth and planetary sciences

Wed. May 27, 2015 6:15 PM - 7:30 PM Convention Hall (2F)

Convener:*Osamu Kuwano(Japan Agency for Marin-Earth Science and Technology), Tomohiro Ohuchi(Geodynamics Research Center, Ehime University), Ichiko Shimizu(Department of Earth and Planetary Science, Graduate School of Science, University of Tokyo), Hidemi Ishibashi(Graduate School of Science, Shizuoka University)

6:15 PM - 7:30 PM

[SCG59-P04] Feasibility Study of Morphological Characterization to Comminuted Particles by A Particle Characterization Approach

*Daisuke SASAKURA1, Aiko HAYAUCHI1, Osamu KUWANO2 (1.Malvern instruments A division of Spectris Co., Ltd., 2.Japan Agency for Marine-Earth Science and Technology)

Keywords:Fault gouge, Particle size, Particls Shape, Comminution, Fractal Distributions

A faults zone contains fine rock powders called gouge that have been ground up by past fault motions. Particle size distribution and particle shape of gouge particles may affect the frictional properties of the fault and reflect the comminution process by the past fault motions. It is well known that particle size distribution (PSD) of fault gouge show power-law distributions. Exponent of this power law, called fractal dimension, is considered to reflect the style and amount of deformation. This report will be discussed for relationship between the particle morphology and a style and a degree of comminution of model particles by automated particle image analysis and laser diffraction as a particle characterization method.

As an automated particle image analysis, Morphologi G3-SE (Malvern Instruments) was used for evaluation of particle size and shape. The observation mode was diascopic mode (Transmittance mode) and a magnification was choose to sufficient to cover 1 to 1,000um. The sample was dispersed with SDU (Sample Dispersion Unit) which attached Morphologi G3-SE. Number of measured particles was over than ten thousand and a parameter filter function on software was used based on shape and pixel number of particle image. As a laser diffraction instruments with dry dispersion methods , Mastersizer3000 with Aero unit (Malvern Instruments) was used for evaluation of particle size in less than 1um as fine particles.