Collaborative Research: Hydrogen Partitioning and Fe3+ Exchange in Mantle Minerals: Effects on Mechanical Behavior

9305187 Mackwell只有从了解水合物质在上地幔条件下的分配方式，才有可能解释力学性质测量。该计划将包括在高压和高温条件下对地幔矿物聚集体进行静态实验，进行红外测量以表征水衍生物种在相间的分配，以及进行穆斯堡尔光谱测量以监测水吸收过程中铁价的变化。最后一项技术特别重要，因为它可以让我们利用暴露在地球表面的矿物上的铁离子比率和红外光谱来推断深层的水分含量和水的分配。最后，通过在湿条件下对多相集料进行变形实验来研究这种分配行为的推断效果。***

9305187 Mackwell Only from an understanding of the way in which hydrous species partition at upper mantle conditions will it be possible to interpret mechanical property measurements. This program will include static experiments on aggregates of mantle minerals under high pressure and temperature conditions, infrared measurements to characterize the partitioning of water-derived species between the phases, and Mossbauer spectroscopy measurements to monitor changes in the iron valence during uptake of water. This last technique is particularly important in that it may allow us to use iron ionic ratios and infrared spectroscopy on minerals exposed at the Earth's surface to infer water contents and water partitioning at depth. Finally, the inferred effects of this partitioning behavior will be investigated by performing deformation experiments on multiphase aggregates under wet conditions. ***