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

这个项目结合了火山学、地球化学、同位素和地质年代学的研究，研究了亚速尔群岛（葡萄牙）的福戈火山和福纳斯火山以及日本的富士火山最近的、高度演化的和化学分区的喷发产物。该项目将包括岩石学和显微分析，主要元素和微量元素以及Sr-Nd-Pb同位素分析，整个岩石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。具体问题包括岩浆分异过程中开放与封闭系统过程的作用，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与喷发体积之间的关系。对亚速尔群岛和富士火山喷发的联合研究将对不同构造背景下（板块内与俯冲带）的岩浆系统和不同成分（碱性与钙碱性）的岩浆系统的过程和时间尺度进行比较。

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).