Collaborative Research: Origin, Composition, and Degassing Characteristics of Magmatic Sulfides in Intermediate to Silicic Volcanic Rocks

该项目将更全面地记录来自廷特山火山群喷口相侵入和流动的岩浆硫化物和寄主岩石的主元素和微量元素组成。此外，将分析来自鱼峡谷凝灰岩(及其相关的火山单元)、毕晓普凝灰岩和内华达州中部火山口杂岩(威廉斯岭和莫雷峰的凝灰岩)的那些凝灰岩，以便进行比较。通过将这些关于硫化物成分的数据与每个火山系统的密集参数和岩浆演化相结合，应该可以模拟岩浆硫化物的起源和模式丰度的变化。还将检查这些硫化物的稳定性和脱气/放出特性。这些数据应该有助于建立一个关于岩浆硫化物在确定各种热液成矿流体的金属比例方面所起作用的一般模型。

This project will more fully document the major and trace element composition of magmatic sulfides and the host rocks from the vent-facies intrusions and flows of the Tintic Mountain Volcanic Group. In addition, those from the Fish Canyon Tuff (and associated volcanic units), Bishop Tuff, and Central Nevada Caldera Complex (tuff of Williams Ridge and Morey Peak) will be analyzed for comparison purposes. By combing these data on sulfide compositions with intensive parameters and magmatic evolution for each volcanic system, it should be possible to model the origin and variations in modal abundance of magmatic sulfides. The stability and degassing/exsolution characteristics of these sulfides will also be examined. These data should help develop a general model about the role of magmatic sulfides in setting the metal ratios of various hydrothermal ore fluids.