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

本研究的目的是建立由橄榄石中致密过渡区相（wadsleyite和ringwoodite）的形核和生长引起的内应力和应变的改进力学模型。有很多证据表明，寄主橄榄石的机械响应会影响转化过程中的动力学和织物的发育。在俯冲岩石圈板块内的低温环境中，橄榄石相对较强，这些机械效应应该是最深刻的。相变及其产生的变质组构对俯冲板块的行为有很大的影响，因为板块的相变决定了板块的相对浮力和强度。pi将通过在各种压力、温度和应力条件下收集的实验产生的相变微观结构的观察，开发相变过程中父相和子相之间力学相互作用的数值模型。* * *

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. ***