Alkaline Volcanism in Magmatic Arcs: Petrologic and Volcanologic Investigations in the Tuxtla Volcanic Field, Veracruz, Mexico

本项目旨在确定墨西哥韦拉克鲁斯州Tuxtla火山场岩浆演化与构造历史之间的关系。Tuxtla火山场是一个岩浆弧，在那里喷发过碱性和钙碱性岩浆类型。该项目将通过描述岩浆源的同位素和微量元素组成特征，确定火山活动的起始年龄及其与当时该地区发生的构造事件的关系，试图确定火山活动与构造活动之间的关系。还将研究熔融和分馏发生的深度，并将整个地区与钙碱性墨西哥火山带的其他地区进行比较。还计划进行火山灾害评估。地质制图将用于确定地层关系。化学和同位素分析将有助于确定岩浆来源的特征及其随时间的演化，并与矿物学分析相结合，将有助于揭示岩浆的化学演化，并确定岩浆演化中涉及的温度和压力。岩石的钾氩和放射性碳年龄测定将用于确定火山活动的起始年龄、岩浆演化速度和最近的喷发历史。该项目的完成将使人们更好地了解墨西哥火山带和其他地区的碱性和钙碱性岩浆作用与构造作用之间的关系。此外，它将在未来火山爆发的情况下提供对该地区居民福祉至关重要的信息。

This project is to determine the relationships between magmatic evolution and tectonic history in the Tuxtla Volcanic Field, veracruz, Mexico, a magmatic arc where both alkaline and calc- alkaline magma types have erupted. The PI will try to determine the relationship between volcanism and tectonism by characterizing the isotopic and trace element composition of the magmatic source, and determining the age of initiation of volcanism and its relationship to tectonic events occurring in the area at the time. The depth at which melting and fractionation took place will also be studied, and the entire area will be compared to other areas of the calc-alkaline Mexican Volcanic Belt. A volcanic hazards assesment is also planned. Geologic mapping will be used to determine stratigraphic relationships. Chemical and isotopic analyses will aid in determining the characteristics of the magma source and its evolution through time, and, combined with mineralogical analyses, will help unravel the chemical evolution of the magmas and determine the temperatures and pressures involved in magmatic evolution. Potassium-Argon and radiocarbon age dating of rocks will be used to determine the age of initiation of volcanism, the rates of magmatic evolution and the recent eruptive history. Completion of the project should give a better understanding of the relationships between alkaline and calc-alkaline magmatism and tectonism in the Mexican Volcanic Belt and elsewhere. In addition, it will provide information critical to the well being of inhabitants of the area in the event of future volcanic eruption.