Frequency Sweep Acoustic Interferometry: Measurement of Silicate Melt Compressibility and Density at High Temperature and Pressure

扫频声干涉测量：高温高压下硅酸盐熔体压缩性和密度的测量

基本信息

批准号：
0440097
负责人：
Rebecca Lange
金额：
$ 40万
依托单位：
Regents of the University of Michigan - Ann Arbor
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
2005
资助国家：
美国
起止时间：
2005-01-01 至 2007-12-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=0440097&HistoricalAwards=false
关键词：
Frequency Sweep Acoustic Interferometry Measurement

项目摘要

An equation of state (P-V-T relation) for magmatic liquids is critical for quantitative models of partial melting and melt transport beneath spreading ridges and subduction zones, where oceanic and continental crust are formed. A major challenge to thermodynamic models of partial melting in the deep mantle is the lack of information on the density of magmatic liquids at high pressure. The largest uncertainties are with the pressure dependence to melt compressibility and with how volatile components affect melt density at high pressure. The primary objective of this proposal is to measure the compressibility and density of numerous geologically relevant liquids as a systematic function of pressure and temperature, using a frequency-sweep acoustic interferometer in an internally heated pressure. These data will provide a quantitative link between the microscopic structure of liquids, obtained from spectroscopic studies, and their macroscopic properties. Thus these data will greatly enhance the utility and insights provided by different spectroscopic tools and molecular modeling within the earth and material sciences. The sound velocity data on melts at high pressure will also be helpful for improved interpretation of seismic velocity variations in the crust and mantle, where partial melt may be present. Graduate students will be partially supported by this grant. The interdisciplinary nature of the training that they will receive is excellent preparation for either an academic career in the earth sciences or an industry career involving high-tech materials.

岩浆液体的状态方程（P-V-T 关系）对于形成洋壳和大陆地壳的扩张脊和俯冲带下方的部分熔融和熔体输运的定量模型至关重要。深部地幔部分熔融热力学模型的一个主要挑战是缺乏高压下岩浆液体密度的信息。最大的不确定性在于熔体压缩性的压力依赖性以及挥发性成分在高压下如何影响熔体密度。该提案的主要目标是在内部加热压力下使用扫频声干涉仪来测量多种地质相关液体的压缩性和密度，作为压力和温度的系统函数。这些数据将提供从光谱研究获得的液体微观结构与其宏观特性之间的定量联系。因此，这些数据将极大地增强地球和材料科学中不同光谱工具和分子建模所提供的实用性和见解。高压熔体的声速数据也将有助于改进对可能存在部分熔体的地壳和地幔中地震速度变化的解释。研究生将获得这笔补助金的部分支持。他们将接受的跨学科培训为地球科学的学术生涯或涉及高科技材料的行业职业做好了良好的准备。