Creep of Mafic and Ultramafic Aggregates

镁铁质和超镁铁质骨料的蠕变

• 批准号: 9018044
• 负责人: Stephen Mackwell
• 金额: $ 10.5万
• 依托单位: Pennsylvania State Univ University Park
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-05-15 至 1993-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9018044&HistoricalAwards=false
• 关键词: Creep; Mafic; Ultramafic; Aggregates

This project will examine the deformation behavior of a series of two-phase aggregates of mantle minerals under well constrained thermodynamic conditions, starting with the olivine- orthopyroxene system, and focusing on the effect of the relative concentration so the two components on the overall strength of the aggregate. Experiments will be performed under conditions favoring deformation by dislocation creep in the constituent minerals. Detailed microstructural investigations using scanning and transmission electron microscopy will check for any microcracking and to investigate the nature and relative contributions of the creep mechanisms in the individual minerals. The experiments will also provide some insight into how the individual deformation mechanisms and slip systems, measured in single crystal studies, can be recast into the behavior of an aggregate.

本项目将研究变形行为的一个 井下地幔矿物两相集合体系列 热力学条件的限制，从橄榄石开始， 斜方辉石系统，并重点对影响的相对 浓度，使两个组件的整体强度 聚合物。 实验将在以下条件下进行： 有利于变形的位错蠕变的组成 矿物 使用扫描进行详细的微观结构研究 透射电子显微镜会检查 微裂纹的性质和相关的研究 蠕变机制在个别矿物中的贡献。 这些实验还将提供一些关于 单个变形机制和滑移系， 单晶体的研究，可以被改写成一个行为， 骨料