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

[305187]麦克韦尔：只有通过理解含水物质在上地幔条件下的分配方式，才有可能解释力学性质的测量结果。该项目将包括高压和高温条件下地幔矿物聚集体的静态实验，表征水衍生物质在相之间分配的红外测量，以及监测水吸收过程中铁价变化的穆斯堡尔光谱测量。最后一项技术尤其重要，因为它可以让我们利用暴露在地球表面的矿物的铁离子比和红外光谱来推断水的含量和水在深处的分配。最后，将通过在潮湿条件下对多相聚集体进行变形实验来研究这种分配行为的推断效应。* * *

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. ***