Development of Anisotropy in Deformed and Recrystallized Rocks

变形和再结晶岩石各向异性的发展

• 批准号: 9902866
• 负责人: Hans-Rudolf Wenk
• 金额: $ 20万
• 依托单位: University of California-Berkeley
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-09-15 至 2004-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9902866&HistoricalAwards=false
• 关键词: Development; Anisotropy; Deformed; Recrystallized; Rocks

9902866WenkIn order to understand the dynamic behavior in the Earth and particularly the development if anisotropy, the propsed research will combine quantitative characterization of naturally and experimentally deforemed rocks (applying optical and elctron microscopy and x-ray, electron and neutron diffraction methods) and ploycrystal plasticity theory. The theory. The theory will be used to simulate the development of crystal preferred orientation and microstructures based on intra-crystalline mechanisms such as a slip and dynamic re-crystallization. The goal of this research is to refine a model for dynamic re-crystallization that ballances nucleation and boundary migration based on the deformation state of individual orientations. It is proposed to first approach simple model systems such as hcp (Zn) and halite (with some relevance for core epsilon-iron, and lower mantle MgO) which are easy for experimentation to capture and quantify some of the critical ingredients. Later the methodology will be applied to the more complex systems of peridotite and granite.

为了了解地球的动力学行为，特别是各向异性的发展，提出的研究将结合自然和实验变形岩石的定量表征（应用光学和电子显微镜以及x射线，电子和中子衍射方法）和多晶塑性理论。这个理论。该理论将用于模拟基于晶内机制（如滑移和动态再结晶）的晶体优选取向和微观结构的发展。本研究的目的是完善一个动态再结晶模型，该模型基于单个取向的变形状态来平衡成核和边界迁移。建议首先接近简单的模型系统，如hcp （Zn）和岩盐（与核心epsilon-iron和下地幔MgO有关），这些系统易于实验捕获和量化一些关键成分。稍后，该方法将应用于更复杂的橄榄岩和花岗岩系统。