Static Compression of Hydrous Silicate Liquids

水合硅酸盐液体的静态压缩

• 批准号: 0509902
• 负责人: Carl Agee
• 金额: $ 25万
• 依托单位: University of New Mexico
• 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: 2005-07-01 至 2009-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0509902&HistoricalAwards=false
• 关键词: Static; Compression; Hydrous; Silicate; Liquids

The primary goal of this project is to determine the density and compressibility of hydrous silicate liquids at high-pressure. This will be accomplished by performing static compression sink/float experiments in piston-cylinder and multi-anvil devices at pressures from 0.5 to 20 GPa. The sink/float technique has been used by this group in previous studies to determine high-pressure density and compressibility of anhydrous liquids that include peridotite, komatiite, terrestrial and lunar basalt, and Fe2SiO4. This study will build on this database and extend it to hydrous compositions by investigating these same liquids with added H2O. The proposed measurements will give new insight into the structure and physical properties of hydrous silicate liquids, and the mobility of water-bearing magmas in the Earth's mantle. Hydrous silicate liquid isothermal bulk moduli (KT) and the pressure derivative (K'), once established by these experiments, can then be applied to determine if equilibrium crystal-liquid density inversions exist during wet melting of the mantle.There is a growing realization that mantle magmatism, both primordial and recent, may frequently happen in the presence of water. This phenomenon could affect a wide range of the Earth's interior processes, from shallow crustal levels to the deep region at the boundary between the mantle and core. The main focus of this study is determine if there are regions in the Earth where certain magmas with dissolved water, also called hydrous silicate liquids, will become trapped or even sink, rather than rising buoyantly to the surface. We know from earlier experimental studies that some magmas, without water, become negatively buoyant at high pressure and can sink deep in the interiors of the Earth and the Moon, but this has never been determined for water-bearing or "hydrous" magmas. Therefore, this is to be one of the first systematic studies to determine the density and compressibility of hydrous silicate liquids at high pressures and temperatures in the laboratory that recreate conditions of magmatism in the Earth's mantle.This project is co-funded by the following programs: Petrology and Geochemistry, and Geophysics programs in the Division of Earth Sciences (GEO) together with the EPSCoR program (EHR).

该项目的主要目标是确定高压下含水硅酸盐液体的密度和可压缩性。这将通过在0.5至20 GPA的压力下进行活塞缸和多隔阀设备中的静态压缩水槽/浮点实验来实现。该组在先前的研究中已使用了水槽/浮点技术，以确定包括橄榄石，katmitite，陆地石，陆生和月球玄武岩以及Fe2sio4在内的无水液体的高压密度和可压缩性。这项研究将基于该数据库，并通过使用添加的H2O研究这些相同的液体扩展到液压成分。所提出的测量将为含水硅酸盐液体的结构和物理特性以及地球披风中水岩浆的迁移率提供新的见解。然后可以应用液压硅酸盐液等温模量（KT）和压力衍生物（K'），然后可以应用以确定地幔湿融化期间是否存在平衡的水晶液密度倒置。这种现象可能会影响地球内部过程的广泛范围，从浅层地壳水平到地幔和核心之间的边界的深区域。这项研究的主要重点是确定地球上是否存在某些带有溶解水的岩浆（也称为含水硅酸盐液体）的区域，将被困或什至下沉，而不是浮动到表面。我们从较早的实验研究中知道，在高压下有些岩浆在没有水的情况下变得负浮力，并且可以沉入地球和月球的内部深处，但这从未确定用于水或“含水”岩浆。因此，这将是确定实验室高压和温度下含水硅酸盐液体的密度和可压缩性的最早的系统研究之一，在地球地幔中重现了岩浆症的条件。该项目由以下程序共同资助：petrology and Geochophersics和Geophysics计划在Epciences of Epcieci（Geophysics）计划（Geophysics）计划（Geophysics）（Geophysics）（Geophysics）（Geophysics）。