Studies of deep earth rheology based on high-pressure deformation experiments using d111-type apparatus

A new high-pressure deformation apparatus D111-type apparatus, which is a larger version of the deformation T-Cup, was recently installed on a synchrotron beamline NE7A at PF-AR, KEK, Tsukuba, Japan. In this ap-paratus, well-controlled deformation experiments can be conducted up to ～30 GPa by driving two opposed second-stage anvils in the Kawai-type multi-anvil assembly. High-pressure and high-temperature deformation experiments with quantitative stress and strain measurements have been carried out using the D111-type apparatus in conjunction with synchrotron radiation. Some studies have been conducted to investigate deep Earth rhe-ology including rheology of hcp iron, rheology of bridgmanite and post-spinel, and olivine-ringwoodite phase transformation under deformation.