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），以实现俯冲工厂实验的关键方面。与LDEO数据库小组合作，将对伊豆-小笠原-马里亚纳和中美洲俯冲工厂焦点地点的新的年轻火成岩的地球化学和同位素数据进行汇编和过滤，以生成每个弧系统的高质量数据的俯冲工厂地球化学参考库。正向模型，以解释从火山前和弧后火山喷发的熔岩在两个焦点网站的化学和同位素组成之间的最重要的差异将产生和测试对本库中的组合物。模型将针对具体地点，利用所有可用的地球物理观测数据生成适合每个重点地点的热结构和熔体分布模型。对每个焦点地点的俯冲沉积物和洋壳成分的最佳估计将被用作模拟俯冲带内俯冲沉积物和洋壳（板片）的平衡变质反应、脱水和熔融的热力学模型的输入。这些板流体和熔体与上覆地幔橄榄岩的相互作用，以产生原始玄武岩将使用“弧玄武岩模拟器”（ABS），一个Excel宏，明确分离的关键强制功能，设计灵活，易于访问。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初级研究生。将通过为“俯冲工厂”编写一个维基百科条目，向公众更广泛地传播最重要的成果。

"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 for Subduction 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 the four experiments. This proposal outlines a 3-year collaborative effort (between 5 US and 2 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 Subduction Factory focus sites will be compiled and filtered to generate a Subduction Factory Geochemical Reference Library of high-quality data for each arc system. Forward models to explain the most important differences between the chemical and isotopic compositions of lavas erupted from the volcanic front and rear-arc volcanoes at the two focus sites will be generated and tested against compositions in this Library. Models will be site-specific, using all available geophysical observations to generate thermal structure and melt distribution models appropriate for each focus site. Best estimates for the compositions of subducted sediments and oceanic crust at each focus site will be used as input to thermodynamic models simulating equilibrium metamorphic reactions, dehydration, and melting of subducted sediments and oceanic crust (slab) within the subduction zone. Interaction of these slab fluids and melts with overlying mantle peridotite 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 to be flexible and accessible. Several improvements to ABS will also be accomplished during 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 Geochemical Library to explore the most important controls on subduction-zone magma genesis will be developed; this will be aimed at upper division Geoscience majors and beginning graduate students. Broader dissemination of the most important results to the general public will be accomplished via development of a Wikipedia entry for "Subduction Factory".