Japan JSPS Program: Investigation of Oxygen Fugacity in Petrologic Experiments at Ultra-High Pressures

9415224 O Neill该奖项为日本东京大学加利福尼亚大学地质与地球物理系Bridget O Neill博士提供为期12个月的日本科学促进协会博士后奖学金。O Neill博士将与固体物理研究所的Takehiko Yagi博士合作进行一个名为“日本JSPS计划：超高压岩石学实验中氧逸度的研究”的研究项目。氧逸度是反映地幔样品构造过程的岩石学参数。通常，氧逸度是在模拟地壳条件和上地幔70公里以下深度的低压岩石学实验中被控制的参数。地幔的深度约为2900公里，对应的压力约为135千兆帕斯卡。到目前为止，还没有人试图控制或确定在这种超高压下的氧逸度。奥尼尔博士和八木博士将利用筑波大学的高压设备，将氧逸度控制技术应用于超高压实验。该团队将在不同温度条件下，在大于5千兆帕斯卡的压力下系统地进行氧逸度实验。他们的研究不仅将扩大地球气压计和地温计的校准范围，而且将有助于提高许多高tc超导体的转变温度。＊＊＊

9415224 O Neill This award supports a 12-month Japan Society for the Promotion of Science Postdoctoral Fellowship for Dr. Bridget O Neill, Department of Geology and Geophysics, University of California, at the University of Tokyo, Japan. Dr. O Neill will work with Dr. Takehiko Yagi, Institute for Solid State Physics, on a research project entitled, Japan JSPS Program: Investigation of Oxygen Fugacity in Petrologic Experiments at Ultra-High Pressures. Oxygen fugacity is a petrologic parameter which reflects the tectonic processes of mantle samples. Usually oxygen fugacity is a controlled parameter in low pressure petrologic experiments simulating conditions of the Earth s crust and to a depth of less than 70 km in the upper mantle. The Earth s mantle extends to a depth of about 2900 km, corresponding to a pressure of about 135 Gigapascals. To date no attempts have been made to control or determine the oxygen fugacity at such ultra-high pressures. Dr. O Neill and Dr. Yagi will utilize the high-pressure facilities at the University of Tsukuba to adapt oxygen fugacity control techniques to ultra-high pressure experiments. The team will systematically conduct oxygen fugacity experiments at pressures greater than 5 Gigapascals under different temperature conditions. Their research will not only extend the calibration range of geobarometers and geothermometers but will be useful in maximizing the transition temperature of many high-Tc superconductors. ***