We investigate olivine grain boundary (GB) migration in natural peridotites experimentally annealed at high pressure and high temperature, and couple the experimental observations to full-field grain growth models to provide the distribution of GB mobilities in natural olivine polycrystals. A stack of four slices of natural mylonitic peridotite (Oman ophiolite) was annealed at 1473 K for 5 h under a confining pressure of 300 MPa of argon in a Paterson press. The three sintered interfaces of the stack are characterized using scanning electron microscopy and electron backscatter diffraction (EBSD) to extract a distribution of apparent (2D) GB displacements. Full-field simulations of numerically sintered interfaces are then used to infer the GB mean mobility and distribution in olivine polycrystal allowing forward modelling exercise to reproduce the experimental GB displacement distribution.

中文翻译：

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通过退火实验和全场建模量化天然橄榄石中的晶界迁移率


我们研究了在高压和高温下实验退火的天然橄榄岩中的橄榄石晶界（GB）迁移，并将实验观察与全场晶粒生长模型结合起来，以提供天然橄榄石多晶中晶界迁移率的分布。将一叠四片天然糜棱岩橄榄岩（阿曼蛇绿岩）在 Paterson 压机中、在 300 MPa 氩气围压下、在 1473 K 下退火 5 小时。使用扫描电子显微镜和电子背散射衍射 (EBSD) 来表征叠层的三个烧结界面，以提取表观 (2D) 晶界位移的分布。然后使用数值烧结界面的全场模拟来推断橄榄石多晶中的晶界平均迁移率和分布，从而允许正演建模练习重现实验晶界位移分布。