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：俯冲工厂重点地点的岩浆成因控制的综合和集成智力优势：MARGINS计划将于2009年结束，组织、综合和集成最重要的结果是四个实验中每一个实验的高度优先事项。该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）为俯冲工厂实验的关键方面做这件事。与LDEO数据库小组合作，来自伊豆-博宁-马里亚纳和中美洲俯冲工厂焦点地点的年轻火成岩将被编译和过滤，以生成一个俯冲工厂地球化学参考库，每个电弧系统的质量数据。Forwardmodels解释的化学和同位素组成的熔岩喷发的火山前和弧后火山在两个焦点网站之间的最重要的差异将产生和测试对本库中的组合物。模型将是站点特定的，使用所有可用的地球物理观测来生成适合每个焦点站点的热结构和熔体分布模型。最佳估计的组成俯冲沉积物和大洋地壳在每个焦点网站将被用来作为输入的热力学模型模拟平衡变质反应，脱水，和熔融的俯冲沉积物和大洋地壳（板）内的俯冲带。这些板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），Excel宏，明确分离的关键强制功能，被设计成灵活和可访问的。更广泛的影响：本项目是响应2004年MARGINS审查委员会关于综合和整合努力的呼吁。将在国家科学会议期间举办两次免费讲习班，传播成果和培训地球科学家使用ABS。将制定一个使用ABS和俯冲工厂地球化学图书馆来探索俯冲带岩浆成因的最重要控制的课程计划;这将针对高年级地球科学专业和预科研究生。将通过为“SubductionFactory”开发一个维基百科条目来向公众更广泛地传播最重要的结果。

"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