HR: 1340h
AN: MR43A-0979 [Abstracts]
TI: High-pressure deformation experiments with Kawai-type apparatus for triaxial deformation (KATD)
AU: * Nishihara, Y
EM: yuu@geo.titech.ac.jp
AF: Tokyo Institute of Technology, 2-12-1, Meguro-ku, Tokyo, 152-8551, Japan
AB:
Knowledge of rheological property of mantle constituent minerals is important for understanding of material
behavior in the Earthfs deep interior. Most of previous studies on rheology of mantle minerals with controlled
deformation have been limited to low-pressure (<3 GPa) due to experimental difficulty. Recently, deformation-
DIA apparatus (D-DIA) and rotational Drickamer apparatus (RDA) have been developed for deformation
experiments at higher pressures (e.g. Wang et al., 2003; Yamazaki and Karato, 2001). However, reported
experimental pressure condition using D-DIA is still limited to <10 GPa, and experiments at low differential
stress condition (< 1 GPa) with RDA is still difficult.
We have installed new high-pressure deformation apparatus "Kawai-type Apparatus for Triaxial Deformation
(KATD)" at Magma Factory, Tokyo Institute of Technology. The KATD is a modification of cubic-type Kawai-type
multi-anvil apparatus with top and bottom differential rams. Since achievable maximum pressure using Kawai-
type apparatus (with WC anvils) is about 30 GPa, deformation experiments up to 30 GPa is expected to be
possible using KATD. Deformation with very low stress level is expected to be possible using KATD because
compression can be done quasi-hydrostatically.
In this presentation, basic performance of KATD and preliminary results of deformation experiments at high-
pressure and high-temperature will be shown. In the most recent experiments, sintered (Mg0.85Fe0.15)O
sample was successfully deformed up to shear strain of >1 at ~15 GPa and 1473 K using hard Al2O3 piston .
DE: 3630 Experimental mineralogy and petrology
DE: 3672 Planetary mineralogy and petrology (5410)
DE: 3902 Creep and deformation
DE: 3924 High-pressure behavior
SC: Mineral and Rock Physics [MR]
MN: 2007 Fall Meeting