Investigation of Internal Stresses and Strains Induced by the Olivine-Spinel Transformation: Mechanical Models and Microstructural Observations

橄榄石-尖晶石转变引起的内应力和应变的研究：力学模型和微观结构观察

• 批准号: 9706289
• 负责人: Pamela Burnley
• 金额: $ 5.5万
• 依托单位: University of Colorado at Boulder
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-07-15 至 1998-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9706289&HistoricalAwards=false
• 关键词: Investigation; Internal; Stresses; Strains; Induced

9706289 Burnley The goal of this investigation is to develop improved mechanical models of the internal stresses and strains caused by nucleation and growth of dense transition zone phases, wadsleyite and ringwoodite, in olivine. There is much evidence to argue that the mechanical response of the host olivine influences kinetics and fabric development during transformation. These mechanical effects should be most profound in low temperature environments within subducting lithospheric slabs where olivine is relatively strong. Phase transformation and the resulting metamorphic fabrics it produces can have a strong influence on the behavior of a subducting slab because transformation in the slab determines its relative buoyancy as well as its strength. The PIs will develop numerical models of the mechanical interactions between parent and daughter phases during transformation, guided by observations of experimentally produced transformation microstructures collected over a wide range of pressure, temperature and stress conditions. ***

小行星9706289 本研究的目的是开发改进的力学模型的内部应力和应变所造成的致密过渡区相，wadsleyite和ringwoodite，在橄榄石的成核和生长。 有很多证据表明，主机橄榄石的机械响应影响动力学和织物的发展过程中转变。 这些力学效应应该是最深刻的俯冲岩石圈板内的橄榄石是相对强大的低温环境。 相变和由此产生的变质组构可以对俯冲板片的行为产生强烈的影响，因为板片中的相变决定了其相对浮力以及强度。 PI将开发转化过程中母相和子相之间的机械相互作用的数值模型，通过在广泛的压力，温度和应力条件下收集的实验产生的转化微观结构的观察来指导。 ***