Understandings of phase transitions of hydrous silicates at mantle conditions

在地幔条件下稳定的含水矿物中氢键的压力响应是了解地球深部物质弹性性质的重要科学指标。在本研究计划中，我们开发了一种仪器，使我们能够使用金刚石对顶砧原位高压光谱观测含水材料。特别地，我们改进了现有的FTIR和拉曼光谱，可以在同一台仪器上同时观测。此外，我们还研究了地幔成因的流体包裹体，例如天然金刚石中的流体包裹体。流体包裹体的近红外光谱表明，流体包裹体的残余压力显着高。还开发了具有非常高空间分辨率的光谱测量。

Pressure response of hydrogen bonds in hydrous minerals stable at the mantle conditions can be an important scientific target for understandings of elastic properties of deep earth materials. In this research project, we have developed an instrument which enables us in-situ high-pressure spectroscopic observations of hydrous materials using a diamond anvil cell. In particular, we have modified a commercially available FTIR and Raman spectra can be observed simultaneously using the same equipment.Furthermore, fluid inclusions of mantle origins, for example fluid inclusions in natural diamonds, were studied. Near infrared spectra of fluid inclusions demonstrated the residual pressure of fluid inclusions to be significantly high. Spectroscopic measurements with very high spatial resolutions were also developed.