Ultrasound Resonance Measurements and Expansivity Measure- ments at 2000 K: Velocities of Sound at Mantle Temperatures

2000 K 下的超声共振测量和膨胀测量：地幔温度下的声速

• 批准号: 9117280
• 负责人: Orson Anderson
• 金额: $ 18万
• 依托单位: University of California-Los Angeles
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-02-01 至 1994-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9117280&HistoricalAwards=false
• 关键词: Ultrasound; Resonance; Measurements; Expansivity; Measure

The objective of this work is to advance the capability of measurement techniques towards the ultimate objective which is to: Measure the temperature dependence of the elastic constants (and velocities) of high pressure phases of mantle minerals in the temperature range of the lower mantle. The objectives of this work are to 1) advance the temperature capability of elastic constant measurements from 1800 K to 2000 K, 2) to decrease the size of the sample measured to sub-millimeter size, 3) to measure iron-bearing minerals at these high temperatures, and 4) to measure the thermal expansivity between 1500 K and 2000 K on a variety of mantle minerals. The methods employed will be to 1) use old and new techniques of resonance ultrasound on small single crystals of various shapes, and 2) to construct a laser interferometer capable of high temperature dilametric measurement. The significance of this work, is that it will allow a higher certainty of isolating the mineralogy of the earth's lower mantle, and that it will greatly augment the thermodynamic database which will be useful for geochemistry and mineralogy.

这项工作的目的是提高测量技术的能力，以实现最终目标，即：测量下地幔温度范围内地幔矿物高压相的弹性常数（和速度）的温度依赖性。 这项工作的目标是 1) 将弹性常数测量的温度能力从 1800 K 提高到 2000 K，2) 将测量样品的尺寸减小到亚毫米尺寸，3) 在这些高温下测量含铁矿物，4) 测量各种地幔矿物在 1500 K 到 2000 K 之间的热膨胀率。 所采用的方法是：1）在各种形状的小单晶上使用新旧共振超声技术，2）构建能够进行高温直径测量的激光干涉仪。 这项工作的意义在于，它将提高分离地球下地幔矿物学的确定性，并且将极大地扩充对地球化学和矿物学有用的热力学数据库。