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The K' of Highly Compressible Silicate Liquids: An Experimental Study

高可压缩硅酸盐液体的 K：实验研究

基本信息

批准号：
0310079
负责人：
Rebecca Lange
金额：
$ 17.85万
依托单位：
Regents of the University of Michigan - Ann Arbor
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2003
资助国家：
美国
起止时间：
2003-07-01 至 2006-06-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=0310079&HistoricalAwards=false
关键词：
Highly Compressible Silicate Liquids Experimental

项目摘要

LangeEAR-0310079A major challenge to modeling the partial melting process at deep mantle depths is the lack of information on the density of magmatic liquids at high pressure. The largest uncertainty is with the pressure dependence on melt compressibility (K0' = dK0/dP), and how K0' varies with melt composition. The goal of this proposal is to tightly constrain values of K0' for four silicate (NaAlSi3O8, CaTiSiO5, Na2Si2O5, K2Si2O5) and three carbonate (Li2CO3, Na2CO3, K2CO3) liquids that are highly compressible at one bar (KT,0 between 4 and 17 GPa at 1600 degrees C). These results, when combined with K0 and K0' data in the literature will provide a robust test of the hypothesis that the K0' of a silicate liquid is inversely correlated with its one-bar bulk modulus (K0). If this new hypothesis is verified, it will allow the K0' of magmatic liquids to be estimated from their one-bar bulk modulus, for which there are well-calibrated models. Conversely, if the postulated relation between K0 and K0' is shown not to hold, the new K0' data for silicate and carbonate liquids will substantially augment the existing data set for liquids for which K0' is known independently of K0. The method that we will use to determine liquid K0' is fusion curve analysis, combined with high-quality phase-equilibrium experiments. This project will provide training to two female graduate students in X-ray diffraction, FTIR spectroscopy, and electron microprobe analysis, as well as with high-pressure and high-temperature equipment including a cold-seal pressure vessel and piston-cylinder apparatus. It will also provide them with an education in thermodynamic calculations of crystal-liquid equilibria, and on the importance of their results to studies of magmatism and volcanism. The skills that they will develop will prepare them equally well for a career in either the earth sciences or the high-tech materials industry.

模拟地幔深部部分熔融过程的一个主要挑战是缺乏高压下岩浆液体密度的信息。最大的不确定性是压力对熔体压缩性的依赖性（K 0 ' = dK 0/dP），以及K 0'如何随熔体组成变化。该提案的目标是严格限制四种硅酸盐（NaAlSi 3 O 8、CaTiSiO 5、Na 2Si 2 O 5、K2 Si 2 O 5）和三种碳酸盐（Li 2CO 3、Na 2CO 3、K2 CO 3）液体的K 0 '值，这些液体在一巴下是高度可压缩的（KT，0在1600 ℃下在4和17 GPa之间）。当与文献中的K 0和K 0 '数据结合时，这些结果将提供硅酸盐液体的K 0'与其一巴体积模量（K 0）负相关的假设的稳健检验。如果这一新的假设得到验证，它将允许的K 0 '的岩浆液体估计从他们的一个酒吧的体积模量，有良好的校准模型。相反，如果K 0和K 0 '之间的假定关系不成立，则硅酸盐和碳酸盐液体的新K 0'数据将大大增加K 0 '独立于K 0已知的液体的现有数据集。我们将采用熔融曲线分析法结合高质量的相平衡实验来测定液相K_0 '。该项目将为两名女研究生提供X射线衍射、傅里叶变换红外光谱学和电子显微探针分析方面的培训，以及包括冷密封压力容器和活塞-气缸装置在内的高压和高温设备方面的培训。它还将为他们提供晶体液体平衡的热力学计算方面的教育，以及他们的结果对岩浆作用和火山作用研究的重要性。他们将发展的技能将为他们在地球科学或高科技材料行业的职业生涯做好准备。