Middle Tertiary Magmatism in East Central Nevada

该项目将使用大量的岩石学框架， 中第三纪，中-晚第三纪火山活动， 内华达州中部作为基础：（1）岩石学研究 在系统演化的瞬间起作用的过程， 完成卡拉马祖凝灰岩的分带工作;（2）详细的 分析初始阶段的同位素和结构变化， 高潮，和系统的衰退;（3）质量的发展 和热收支的关系。 的岩石 内华达州中东部特别适合这项研究 因为它们代表了一个大的体积（数千立方 公里）的变辉岩浆，侵入相当于 可能是典型的钙碱性岩基 而且他们 都以它们的年龄，质地， 矿物学、常量元素、微量元素和同位素 所有这些都符合三个阶段 岩浆系统的演化

This project will use the petrologic framework of voluminous, middle Tertiary, intermediate to silicic volcanism in east- central Nevada as a basis for : (1) A study of the petrologic processes acting at an instant in the evolution of the system, by completing work on zonation in the Kalamazoo Tuff; (2) A detailed analysis of isotopic and textural changes during inception, climax, and waning of the system; and (3) Development of a mass and thermal budget of an evolving magma system. The rocks of east-central Nevada are particularly suited for this study because they represent a large volume (thousands of cubic kilometers) of metaluminous magma, the intrusive equivalent of which could be a typical "calcalkaline" batholith. Also, they have been characterized with respect to their age, texture, mineralogy, and major-element, trace-element, and isotopic compositions, all of which are consistent with a three stage evolution of the magmatic system.