U.S.-Germany Cooperative Research: Evolution of Melt Distribution during Deformation of Partially Molten Rocks: Implicatons for Geodynamical Processes

0123224Kohlstedt该奖项支持David Kohlstedt和明尼苏达双城大学的学生与德国拜罗伊特大学拜尔里斯地质研究所的Stephen Mackwell合作。该项目将重点研究部分熔融的地幔岩石在变形过程中熔体拓扑的演变。这项研究的动机是观察到少量的熔体对部分熔融岩石的物理性质有很大影响。熔体网络的连通性和几何形状控制着渗透率、流变性、导电性、地震速度和地震衰减。德国实验室的一种新的扭转装置为研究熔体拓扑的演变提供了最好的试验台；为了开发熔体再分布模型，量化熔体分布对应力状态的依赖最好通过直接比较每个实验室分别进行的实验结果来完成。该工作计划允许研究生广泛参与国际旅行和研究。

0123224KohlstedtThis award supports David Kohlstedt and students from the University of Minnesota-Twin Cities in a collaboration with Stephen Mackwell of the Bayerisches Geoinstitut at the University of Bayreuth, Germany. The project will focus on the evolution of melt topology during deformation of partially molten mantle rocks. The research is motivated by the observation that a small amount of melt has a large effect on the physical properties of a partially molten rock. The connectivity and geometry of the melt network control permeability, rheology, electrical conductivity, seismic velocities, and seismic attenuation. A new torsion apparatus in the German lab provides the best test bed to investigate the evolution of melt topology; quantification of the dependence of melt distribution on stress state for developing models of melt redistribution is best accomplished by direct comparison of results of experiments performed in each lab separately. The work plan provides for extensive participation by graduate students in the international travel and research.