Nature of Silicate Melts: Role of Highly Charged Cations

这项持续的研究项目将研究高电荷阳离子在过碱、金属铝和过铝富SiO_2熔体中的溶液特征。用相平衡、动力学和光谱技术研究K2O-Na2O-Al_2O_3-SiO_2-H_2O单长花岗岩系中的Nb、Ta、Ti和Sn。高温显微拉曼光谱将用于研究熔体的微观结构。这项研究的目的是建立这些高电荷阳离子与网络形成、网络修饰和其他高电荷阳离子相互作用的等级，并研究高硅流纹岩和伟晶岩等高度演化的岩浆的相平衡。

This continuing research project will examine the solution characteristics of highly charged cations in peralkaline, metaluminous and peraluminous SiO2-rich melts. Phase equilibria, kinetic, and spectroscopic techniques will be applied to the study of Nb, Ta, Ti and Sn in the haplogranite system K2O-Na2O-Al2O3-SiO2-H2O. High- temperature micro-Raman spectroscopy will be used for the study of melt microstructure. The objectives of the research are to establish a hierarchy of interactions of these highly charged cations with network-forming, network-modifying, and other highly charged cations and to examine the phase equilibria of highly evolved magmas such as high silica rhyolites and pegmatites.