Magma Fractionation Processes and Timescales: Fogo, Furnas and Fuji Volcanoes

岩浆分馏过程和时间尺度：福戈火山、富士火山和富士火山EAR-0207529 PI：WIDOM这个项目综合了火山学、地球化学、同位素和地质年代学的研究，对葡萄牙亚速尔群岛的福戈火山和富士火山以及日本富士火山最近高度演化和化学分区的喷发产物进行了研究。该项目将包括岩相学和微探针分析，常量和痕量元素和锶-钕-铅同位素分析，全岩浮石和矿物和玻璃分离物的U系列不平衡研究，以及长石分离物的高精度Ar-Ar定年。将讨论的具体问题包括开放和封闭系统过程在岩浆分异过程中的作用，岩浆分异和化学分带发生的时间尺度，以及岩浆停留时间尺度和喷发量之间的关系。对亚速尔群岛和富士火山喷发的联合研究将使人们能够比较不同构造环境下的岩浆系统(板内和俯冲带)以及成分不同的岩浆系统(碱性和钙碱性)的过程和时间尺度。

Magma Fractionation Processes and Timescales: Fogo, Furnas and Fuji VolcanoesEAR- 0207529 PI: WidomThis project is a combined volcanological, geochemical, isotopic and geochronologic study of recent, highly evolved and chemically zoned eruptive products of Fogo and Furnas volcanoes in the Azores (Portugal), and Fuji volcano in Japan. The project will involve petrographic and microprobe analysis, major and trace element and Sr-Nd-Pb isotope analysis, and U-series disequilibria studies of whole rock pumices and mineral and glass separates, as well as high precision Ar-Ar dating of feldspar separates. Specific questions that will be addressed include the role of open vs. closed system processes during magmatic differentiation, the timescales over which magma differentiation and chemical zonation occur, and the relationship between magma residence timescales and eruptive volumes. The combined studies of eruptions from the Azores and Fuji will allow comparisons of the processes and timescales operating in magmatic systems in distinct tectonic settings (intraplate vs. subduction zone), and in magmatic systems that are compositionally distinct (alkaline vs. calc-alkaline).