Silicic melt evolution in the early Izu-Bonin arc recorded in detrital zircons

了解地球表面构造板块的运动以及这些板块最终返回地球内部的过程，是我们了解地球及其自然灾害（如地震、海啸和火山爆发）的核心。这项研究的重点是了解火山的形成，增长和最终消亡，标志着俯冲的过程，在那里构造板块返回地球内部。国际海洋发现计划从西太平洋海底深处回收的矿物将被检查，以破译火山生长的历史。这项研究的目的是利用这些被称为锆石的矿物的化学性质，更好地了解火山的生命周期，特别是火山爆发的时间。这项研究涉及研究和教育的强有力的整合，涉及本科大学生在实验室和实地研究项目，在类似的海底火山系统，现在暴露在陆地上的Sierra内华达州山脉在美国西部。本研究的目标是更好地了解在一个新的和不断发展的洋内火山弧的岩石学联系，寻找火山和英云闪长岩弧深成岩和使用它来更好地了解相关的岩浆过程的演变，通过时间，更好地了解的代熔融。这项研究的主要目标是测试是否（或在多大程度上）碎屑锆石在钻芯，回收国际海洋钻探计划远征351和其他遗留的海洋钻探核心从一个相对原始的海洋弧设置，记录区域和/或长期变化的岩浆熔融结晶岩浆锆石。锆石的地质年代学和微量元素地球化学将允许的热和熔融的化学演化记录弧派生碎屑锆石和火成岩锆石回收的疏浚样品的同期弧英云闪长岩之间的比较。这项研究还将产生一个内部一致的数据库的地球化学参数弧衍生锆石从组成范围的海洋弧，这将是有用的比较锆石的来源研究，因为这些研究的发展，更普遍地包括关键的地球化学来源指标。

Understanding the movement of tectonic plates across Earth's surface and the eventual return of these plates to the interior of our planet is central to our knowledge of Earth and its natural hazards such as earthquakes, tsunamis, and volcanic eruptions. This research focuses on understanding the formation, growth and eventual demise of volcanoes that mark the process of subduction, where tectonic plates return to Earth's interior. Minerals recovered from deep beneath the western Pacific Ocean floor by the International Ocean Discovery Program will be examined to decipher the history of volcano growth above an evolving subduction zone. The goals of the research are to use the chemistry of these minerals, called zircons, to better understand the life cycle of volcanoes, especially the timing of explosive volcanic eruptions. This research involves strong integration of research and education by involving undergraduate university students both in the laboratory and in field-based research projects at similar ocean floor volcanic systems that are now exposed on land in the Sierra Nevada mountains in the western United States. The goal of this study is to better understand the generation of silicic melts in a new and evolving intra-oceanic volcanic arc by searching for petrologic links between silicic volcanism and tonalitic arc plutonism and using this to better understand the evolution of the related magmatic processes through time. The primary goal of the research is to test whether (or to what extent) detrital zircons in drill cores, recovered by the International Ocean Drilling Program Expedition 351 and other legacy ocean drilling cores from a relatively primitive oceanic arc setting, record the regional and/or secular variation in silicic melts that crystallized magmatic zircon. Geochronology and trace element geochemistry of the zircons will allow comparisons between the thermal and melt chemical evolution recorded by arc-derived detrital zircons and by igneous zircons recovered in dredge samples of contemporaneous arc tonalite. This study will also generate an internally-consistent database of geochemical parameters for arc-derived zircons from a compositional range of marine arcs that will be useful for comparative zircon provenance studies, as these studies evolve to more commonly include key geochemical provenance indicators.