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。与LDEO数据库组合作，将汇编和过滤来自伊豆-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，为每个弧系统生成一个俯冲工厂地球化学参考图书馆的高质量数据。将生成正演模型，以解释两个焦点地点的火山前弧和弧后火山喷发的熔岩的化学和同位素组成之间最重要的差异，并根据该库的成分进行测试。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俯冲带内俯冲沉积物和海洋地壳（板）平衡变质反应、脱水和熔融的热力学模型的输入。这些板块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）进行建模，这是一个Excel宏，明确分离了关键的强迫函数，设计灵活且易于访问。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开发一个维基百科条目“潜没工厂”来完成。

"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".