MARGINS: Collaborative Research: Synthesis and Integration of Magmagenetic Controls for Subduction Factory Focus Sites

“该奖项是根据2009年美国复苏和再投资法案(公法111-5)资助的。”合作研究：俯冲工厂重点地点磁性控制的综合和集成智力价值：Margance计划将于2009年结束，最重要成果的组织、综合和集成是四个实验中每一个实验的高度优先事项。这份提案概述了一项为期3年的合作努力(5名美国科学家和2名日本科学家)，以实现俯冲工厂实验的关键方面。在与LDEO数据库小组的合作下，来自伊豆-博宁-马里亚纳和中美洲俯冲工厂焦点地点的新鲜年轻火成岩的地球化学和同位素数据将被汇编和过滤，以生成每个弧系的高质量数据的俯冲工厂地球化学参考库。将建立模型，以解释火山前缘和弧后火山在两个焦点地点喷发的熔岩的化学和同位素组成之间的最重要差异，并与该文库中的成分进行对比测试。模型将因地制宜，使用所有可用的地球物理观测来生成适合每个焦点地点的热结构和熔体分布模型。对每个焦点位置的俯冲沉积物和洋壳成分的最佳估计将作为热力学模型的输入，模拟俯冲带内俯冲沉积物和洋壳(板块)的平衡变质反应、脱水和熔融。这些板条流体和熔体与上覆地幔橄榄岩的相互作用产生原始玄武岩将使用“弧玄武岩模拟器”(ABS)来模拟，这是一个Excel宏，显式地分离关键的强迫函数，并且被设计为灵活和可访问的。在这个项目中，ABS还将实现几个改进。广泛的影响：这个项目是为了响应2004年利润率审查委员会对综合和整合工作的呼吁。传播成果和培训地球科学家使用ABS将在国家科学会议的两个免费讲习班上完成。将制定一项课程计划，利用ABS和俯冲工厂地球化学库探索俯冲带岩浆成因的最重要控制因素；这将针对高年级地球科学专业学生和初级研究生。最重要的成果将通过开发一个维基百科词条向公众广泛传播。自然科学基础建议摘要建议：0840794 PI姓名：斯特恩，罗伯特普林德

"This award is funded under the American Recovery and Reinvestment Act of 2009(Public Law 111-5)."Collaborative Research: Synthesis and Integration of Magmagenetic Controls forSubduction Factory focus sitesIntellectual Merit: The MARGINS program ends in 2009, and the organization,synthesis, and integration of the most important results is a high priority for each of thefour experiments. This proposal outlines a 3-year collaborative effort (between 5 US and2 Japanese scientists) to do this for key aspects of the Subduction Factory experiment.In co-operation with the LDEO database group, geochemical and isotopic data for fresh,young igneous rocks from the Izu-Bonin-Mariana and Central America SubductionFactory focus sites will be compiled and filtered to generate a Subduction FactoryGeochemical Reference Library of high-quality data for each arc system. Forwardmodels to explain the most important differences between the chemical and isotopiccompositions of lavas erupted from the volcanic front and rear-arc volcanoes at the twofocus sites will be generated and tested against compositions in this Library. Models willbe site-specific, using all available geophysical observations to generate thermalstructure and melt distribution models appropriate for each focus site. Best estimates forthe compositions of subducted sediments and oceanic crust at each focus site will beused as input to thermodynamic models simulating equilibrium metamorphic reactions,dehydration, and melting of subducted sediments and oceanic crust (slab) within thesubduction zone. Interaction of these slab fluids and melts with overlying mantleperidotite to yield primitive basalt will be modeled using the "Arc Basalt Simulator"(ABS), an Excel macro that explicitly separates key forcing functions and is designed tobe flexible and accessible. Several improvements to ABS will also be accomplishedduring this project.Broader Impacts: This project is in response to calls for synthesis and integration effortsby the 2004 MARGINS Review Committee. Dissemination of results and training Earthscientists to use ABS will be accomplished at two free workshops at national scientificmeetings. A lesson plan that uses ABS and the Subduction Factory GeochemicalLibrary to explore the most important controls on subduction-zone magma genesis willbe developed; this will be aimed at upper division Geoscience majors and beginninggraduate students. Broader dissemination of the most important results to the generalpublic will be accomplished via development of a Wikipedia entry for "SubductionFactory".NATIONAL SCIENCE FOUNDATIONProposal AbstractProposal:0840794 PI Name:Stern, RobertPrinted