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

“这项奖励是根据2009年美国复苏和再投资法案（公法111-5）资助的。”知识价值：边际项目将于2009年结束，组织、综合和整合最重要的结果是这四个实验的重中之重。该提案概述了一个为期3年的合作努力（5名美国科学家和2名日本科学家），以完成俯冲工厂实验的关键方面。在LDEO数据库组的合作下，来自伊豆-博宁-马里亚纳和中美洲俯冲工厂重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，以生成一个俯冲工厂地球化学参考图书馆，为每个弧系统提供高质量的数据。本文将生成正拟模型，以解释两个着陆点的火山前、弧后火山喷发的熔岩的化学和同位素组成之间的最重要差异，并与该库中的成分进行对比测试。模型将针对具体地点，使用所有可用的地球物理观测数据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海洋地壳组成的最佳估计将被用作模拟平衡变质反应、脱水和俯冲带内俯冲沉积物和海洋地壳（板）融化的热力学模型的输入。这些板状流体和熔体与上覆的地幔橄榄岩相互作用产生原始玄武岩，将使用“弧玄武岩模拟器”（ABS）进行建模，这是一个Excel宏，明确分离了关键的强迫函数，设计得灵活易用。在这个项目中，还将完成对ABS的几项改进。更广泛的影响：该项目是响应2004年边际审查委员会关于综合和整合努力的呼吁。结果的传播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。利用ABS和俯冲工厂地球化学文库探讨对俯冲带岩浆成因最重要的控制因素，制定教案；本课程主要针对高年级地学专业学生和研究生。更广泛地向公众传播最重要的结果将通过维基百科上“SubductionFactory”条目的开发来完成。国家科学基金会提案摘要提案：0840794 PI姓名：Stern， robert print

"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