Mineralization, Differentiation, and Eruption of Highly-Evolved Rhyolites of Western North America

本项目提出分析石英中的玻璃夹杂物 西部三个锡矿化流纹岩中的斑晶 北美的挥发物和Li、Be、Rb、Cs、Y、Nb、Ba、Sr， Th、Y、Mo、W、REE、Sn等元素的电子探针分析 微探针和傅里叶变换红外光谱。 的 数据将与现有的关于 岩石学、场关系和全岩地球化学， 了解挥发物的富集和消耗，以及 演化岩浆中的主量元素、微量元素和成矿元素。 这项研究将 决定了高度演化的岩浆如何分化， 限制最大浓度的精确值 在这样的系统中的岩浆挥发性成分， 真正的岩浆挥发分丰度为喷发式。

This project proposes to analyze glass inclusions in quartz phenocrysts from three tin-mineralized rhyolites of western North America for volatiles and Li, Be, Rb, Cs, Y, Nb, Ba, Sr, Th, Y, Mo, W, REE's and Sn by electron microprobe, ion microprobe, and Fourier transform infrared spectroscopy. The data will be integrated with existing information on the petrology, field relations, and whole rock geochemistry to better understand the enrichment and depletion of volatiles, as well as major, trace, and ore elements in evolved magmas. The study will determine how highly-evolved magmas become differentiated, will constrain accurate values for the maximum concentrations of magmatic volatile constituents in such systems, and will relate true magmatic volatile abundances to eruptive style.