The Effects of Olivine Anisotropy on Liquid Distribution, Seismic, and Electrical Properties of Partial Melts of the Upper Mantle

橄榄石各向异性对上地幔部分熔体的液体分布、地震和电学性质的影响

• 批准号: 9219193
• 负责人: Harve Waff
• 金额: $ 11万
• 依托单位: University of Oregon Eugene
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-07-15 至 1995-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9219193&HistoricalAwards=false
• 关键词: Effects; Olivine; Anisotropy; Liquid; Distribution

This is an experimental investigation of the shapes of melt inclusions in upper mantle partial melts. This investigation is motivated by the observation that the crystal-melt morphology of experimentally produced samples is not consistent with theoretically predicted smoothly curved crystal-melt interfaces. The melt geometry has a paramount effect on seismic velocities, and the data can be applied to model the upper mantle velocity structure in the presence of melt. Analysis of digital backscattered electron images of the post-run samples will be used to obtain the parameters needed (such as the aspect ration of melt inclusions, their area, the total melt fraction) to calculate seismic velocities, based on established models of elastic, anelasic and electrical properties of partially molten rocks. This is a promising new approach to characterize the melt distribution in upper mantle systems.

这是对上地幔部分熔体中熔体包裹体形状的实验研究。这项研究的动机是观察到实验产生的样品的晶体-熔体形态与理论预测的光滑弯曲晶体-熔体界面不一致。熔体几何形状对地震速度有重要影响，这些数据可用于模拟存在熔体的上地幔速度结构。根据已建立的部分熔融岩石的弹性、非弹性和电学性质模型，通过对运行后样品的数字背散射电子图像的分析，获得计算地震速度所需的参数（如熔体包裹体的纵横比、面积、总熔体分数）。这是表征上地幔体系熔体分布的一种有前景的新方法。