Elasticity of Iron-bearing Mantle Minerals

含铁地幔矿物的弹性

• 批准号: 0711591
• 负责人: J Brown
• 金额: $ 40万
• 依托单位: University of Washington
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-09-01 至 2014-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0711591&HistoricalAwards=false
• 关键词: Elasticity; Iron; bearing; Mantle; Minerals

The investigators are undertaking velocity measurements on lower mantle constituents in order to better understand the impact of the high-spin to low-spin (HSLS) electronic transition on lower mantle seismic profiles. They will measure velocities using Impulsive Stimulated Light Scattering on samples loaded in diamond anvil cells. The team seeks to characterize derivatives in velocity of ferro-periclase caused by changes in electronic configuration, iron content, temperature and pressure. These results will be interpreted within the context of Earth's deep mantle through further extension and application of the theory for the transition. Ultimately, elastic constants for ferro-periclase should be measured under mantle conditions of temperature in excess of 1000K as well as pressure. However, a reasonable goal in the near term will be to undertake high-pressure studies under modest conditions of heating and cooling. A quantitative validation of predictions under experimentally accessible conditions of temperature would lend confidence in the extrapolation to mantle temperatures. The successful characterization of elastic properties through the HSLS transition in iron-bearing silicate perovskites remains a longer term goal. Challenges include obtaining samples of sufficient quality to undertake the experiments. The project includes training of a graduate student.

研究人员正在对较低地幔成分进行速度测量，以便更好地了解高旋转对低旋转（HSL）电子过渡对低地幔地震地震曲线的影响。它们将使用钻石砧细胞中的样品上的脉冲刺激光散射测量速度。该团队试图表征由于电子构型，铁含量，温度和压力的变化而引起的铁质固体速度的导数。这些结果将通过进一步扩展和对过渡理论的应用进行进一步扩展和应用，在地球深陆壁的背景下进行解释。最终，应在超过1000k和压力的温度的地幔条件下测量用于铁 - 前期的弹性常数。但是，在短期内，一个合理的目标是在适度的加热和冷却条件下进行高压研究。在实验可访问的温度条件下对预测的定量验证将使外推到地幔温度的外推信心。通过HSLS过渡在铁硅酸盐钙钛矿中成功表征弹性性能仍然是一个长期的目标。 挑战包括获得足够质量的样本来进行实验。该项目包括培训研究生。