Experimental investigations of coupling behaviors between transformation and deformation at high pressure

为了了解深部地震和俯冲洋板在地幔对流中大变形的机制，我们研究了高压条件下地幔矿物的变形和转化的耦合行为。主要通过同步辐射(SOR)原位X射线观测，研究了有形变和无形变的对流地幔中发生的各种反应的动力学。用变形多砧仪成功地获得了相变时间(t-t)和应力-应变(S-S)曲线。我们还初步将SOR D-DIA系统与最新开发的多重声发射(AE)测量系统相结合，使其能够同时观察反应动力学、蠕变行为和剪切不稳定性。本研究开发的S-S-t-t-AE原位观测系统将是揭示地幔过渡带俯冲板块复杂行为的有力工具。

In order to understand mechanisms of deep earthquakes and large deformations of subducting oceanic plates in mantle convective currents, we have investigated the coupling behaviors between transformation and deformation in mantle minerals at high pressures. Kinetics of various types of reactions occurred in convective mantle have been examined with and without deformation mainly by synchrotron radiation (SOR) in-situ X-ray observations. We succeeded to obtain both transformation-time (t-t) and stress-strain (s-s) curves by using deformation multi-anvil (D-DIA) apparatus. We also preliminarily combined the SOR D-DIA system with newly developed multiple acoustic emission (AE) measurement system, which enables to simultaneously observe reaction kinetics, creep behaviors, and shear instability. The in-situ s-s-t-t-AE observation system developed in this study will be a powerful tool to reveal complex behaviors of subducting plates in mantle transition zone.