Collaborative Research: Melt Transport and Mechanical Properties in Partially Molten Peridotites

根据该合同，PIs将继续进行一项实验研究，调查排水和不排水条件下部分熔融橄榄岩的物理性质。本工作的目的是约束部分熔融基性岩石的变形与熔体迁移之间的关系，并了解这些岩石中熔体在不同温度、应力、静岩压力、岩浆压力、应变速率和时间条件下迁移的物理机制。pi的初步实验表明，固体基体和熔体形成了一个系统，其力学性能在很大程度上取决于排水条件和外部载荷，并且可能有丰富多样的力学行为。将使用多种实验技术，包括在等静力加载过程中提取熔体，在排水和不排水条件下进行常规三轴力学实验，以及使用脉冲衰减和振荡孔隙压力技术进行渗透率测量。实验将有两种固相：辉石和橄榄石，熔体含量降至5%。将使用光学显微镜、扫描电镜和透射电镜进行观察。这项研究需要研究生的参与，其结果将广泛应用于地球科学的许多子领域。

Under this award, the PIs will continue an experimental study investigating the physical properties of partially molten peridotite under drained and undrained conditions. The goals of this work are to constrain the relation between deformation and melt migration in partially molten mafic rocks and to understand the physical mechanisms of the migration of melt in those rocks under varying conditions of temperature, stress, lithostatic pressure, magma pressure, strain rate and time. Initial experiments by the PIs indicate that the solid matrix and melt form a system whose mechanical properties strongly depend on the drainage conditions and external loading, and a rich variety of mechanical behavior is possible. A combination of experimental techniques will be used, including extraction of melt during isostatic loading, conventional triaxial mechanical experiments under drained and undrained conditions, and permeability measurements using the pulse decay and oscillating pore pressure techniques. The experiments will have two solid phases: pyroxene and olivine and melt contents down to 5%. Observations will be made with optical microscopes, SEM, and TEM. The study entailes graduate student involvement, and the results will be widely applicable in many sub fields of geoscience.