Nature of Silicate Melts: Role of Highly Charged Cations

这个持续的研究项目将研究高电荷阳离子在过碱性、铝质和过铝质富sio2熔体中的溶解特性。相平衡、动力学和光谱技术将应用于k20 - na20 - al2o3 - sio2 - h2o单倍花岗岩体系中Nb、Ta、Ti和Sn的研究。高温微拉曼光谱将用于熔体微观结构的研究。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层次结构，并研究高硅流纹岩和伟晶岩等高演化岩浆的相平衡。

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.