Water-Rich Magmatic Systems: H2O and Silicate Solubility and Solubility Mechanisms in Hydrous Melts and Silicate-Saturated Aqueous Solutions at Pressures and Temperatures ...

[9901886]迈森：关于地壳和上地幔中岩浆和含水流体的熔融、结晶和质量运输的实验室数据将被用来描述地球上的物质循环。该项目整合了在地壳和上地幔压力和温度范围内，水在岩浆液体中的溶解度数据和硅酸盐在水溶液中的溶解度行为的采集。溶解度数据和结构信息将主要在具有一系列成分的过碱性铝硅酸盐系统中获得，以便能够模拟岩浆液体，包括玄武岩，安山岩和流纹岩成分。为此，我们将研究熔体聚合的影响，Al2O3的影响，以及金属阳离子（碱和碱土）对含水熔体中H2O溶解度行为和水溶液中硅酸盐溶解度的相对影响。溶解度测量将通过对淬火材料的仪器技术的组合以及当熔体和流体未淬火到均匀相时的相平衡测量来进行。熔体和流体的结构信息将通过与外部加热的金刚石砧细胞结合使用共聚焦微罗曼光谱来获得。需要时，将使用核磁共振来分配拉曼带并校准拉曼带强度，以获得有关含水熔体和富硅酸盐流体中结构单元丰度的定量信息。这些结果将用于建立熔体和流体结构之间的联系，以及熔体和流体中结构单元之间的组成-活性关系、液相关系、含水岩浆液体和硅酸盐饱和水溶液的密度和粘度等性质。

9901886MysenLaboratory data on melting, crystallization, and mass transport of magma and aqueous fluids in the Earth's crust and upper mantle will be employed to characterize materials recycling in the Earth. The project integrates acquisition of solubility data and solubility behavior of H2O in magmatic liquids and of silicate in aqueous solutions in the pressure and temperature range of the Earth's crust and upper mantle. Solubility data and structural information will be obtained primarily in peralkaline aluminosilicate systems with a range of compositions so as to be able to model magmatic liquids including basalt, andesite, and rhyolite compositions. To this end, we will examine the effect of melt polymerization, the influence of Al2O3, and relative effects of metal cations (alkalis and alkaline earths) on both on the H2O solubility behavior in hydrous melts and the silicate solubility in aqueous solutions. Solubility measurements will be carried out by combinations of instrumental techniques on quenched materials as well as phase equilibrium measurements when the melts and fluids to not quench to a homogeneous phase. Structural information on both melts and fluids will be obtained by using confocal microRaman spectroscopy in conjunction with the externally heated diamond anvil cell. Nuclear magnetic resonance will be employed when needed to assign Raman bands and to calibrate Raman band intensities to obtain quantitative information on the abundance of structural units in hydrous melt and silicate-rich fluids. The results will be used to establish the links between melt and fluid structure on the one hand and properties such as composition-activity relations among structural units in melts and fluids, liquidus phase relations, density and viscosity of hydrous magmatic liquids and silicate-saturated aqueous solutions.