Collaborative Research: Tectonic Links, Magma Fluxes, and Single Mineral Geochemistry in Plutonic Systems From 5-30 km Depth, Cascades Core, Washington

合作研究：5-30 公里深度的深成系统中的构造联系、岩浆通量和单一矿物地球化学，Cascades Core，华盛顿

• 批准号: 0948388
• 负责人: Samuel Bowring
• 金额: $ 21.43万
• 依托单位: Massachusetts Institute of Technology
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-06-01 至 2014-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0948388&HistoricalAwards=false
• 关键词: Collaborative; Research; Tectonic; Links; Magma

Collaborative Research: Tectonic links, magma fluxes, and single mineral geochemistry in plutonic systems from 5-30 km depth, Cascades core, WashingtonIntellectual Merit. Continental magmatic arcs are the site of massive additions of mantle derived magmas which serve to drive melting, thickening, and reorganization of the crust. Much of what we know about Cretaceous and older continental magmatic arcs results from studies of the physics and chemistry of plutonic rocks, and the derivative data strongly influence models of crustal growth and evolution. In contrast to modern arcs where single eruptive units may be analyzed, plutons record a much richer, albeit complex, history and represent a much greater percentage of the total magmatic flux than volcanic rocks alone. Critical questions concern how and at what rate intermediate composition magmas move through the crustal column, and how the crust accommodates these potentially large fluxes? Key to answering these questions is to understand how large masses of crystallized magmas or plutons and batholiths are constructed. To address these questions, collaborative research is proposed to better understand sub-arc magmatic plumbing systems. This project focuses on the roots of a continental magmatic arc in the North Cascades that comprises three well-exposed intrusive bodies emplaced at different depths in the crust. Integrated field mapping, structural analysis, mineral geochemistry, high-precision geochronology and coupled isotopic studies will be employed to [1] determine the degree to which plutons represent single magma batches or complex mixtures of partially crystallized magmas of different origins, [2] estimate magma flux rates and timescales for melt generation, transport, and eruption of intermediate composition magmas, and [3] evaluate potential linkages between regional tectonic strain and magma formation. This multidisciplinary collaborative research is expected to contribute significantly to understanding of magma plumbing systems and the formation of plutons in continental magmatic arcs.Broader Impacts. This research will support Ph.D. students at MIT and USC, and at least 2 M.S. students at SJSU, and multiple undergraduate student assistants at all 4 institutions. Bpth SJSU PIs have supervised 2 B.S. research projects supported by their most recent grants, and Paterson teaches a formal research class at USC that has involved 20 undergraduates in NSF-supported research. Graduate students from SJSU and USC will visit Kent's lab at OSU to conduct their own analyses, and the MIT graduate student will visit SJSU and assist in SHRIMP analyses. Four M.S. students at SJSU have gone to MIT to carry out U-Pb dating under the tutelage of PI Bowring and his students, and this type of interaction is expected to continue. All of the PIs routinely incorporate their research in class lectures and use research samples in lab courses. Most importantly, The PI's are demonstrating to a large cross section of new students the power of strongly interdisciplinary and collaborative work.

协作研究：构造链接，岩浆通量和单个矿物地球化学在5-30公里深度，cascades core，WashingtonIntellectual功绩。大陆岩浆弧是大量添加地幔衍生的岩浆的地点，这些岩浆可驱动地壳融化，增厚和重组。我们对白垩纪和古老的大陆岩浆弧的了解，是对岩石岩石物理和化学的研究，衍生数据强烈影响地壳生长和进化的模型。与可以分析单个爆发单元的现代弧相反，木板记录了比单独的火山岩更丰富，虽然复杂，历史，并且代表了总岩浆通量的百分比。关键问题涉及中间岩浆如何以及以什么速率通过地壳柱移动，以及地壳如何适应这些潜在的大型通量？回答这些问题的关键是了解如何构建大量结晶的岩浆或岩石和浴石。为了解决这些问题，提出了协作研究以更好地了解亚弧形岩浆管道系统。该项目的重点是北部级联的大陆岩浆弧的根部，该弧形包括三个曝光良好的侵入物体，这些物体位于地壳的不同深度。综合现场映射，结构分析，矿物地球化学，高精度地质学和耦合同位素研究将用于[1]确定岩石代表不同起源的部分结晶的岩浆的单个岩浆批处理或复杂混合物的程度，[2]岩浆通量速率和时间尺度，用于中间组成岩浆的熔体产生，运输和喷发，[3]评估区域构造菌株与岩浆形成之间的潜在联系。预计这项多学科合作研究将对岩浆管道系统的理解以及大陆岩浆弧的形成产生重大贡献。这项研究将支持博士学位。麻省理工学院和南加州大学的学生，以及至少2 M.S. SJSU的学生以及所有四个机构的多个本科生助理。 BPTH SJSU PIS已监督2 B.S.研究项目得到了他们最近的赠款的支持，帕特森（Paterson）在南加州大学（USC）教授一项正式研究课程，该课程涉及20名在NSF支持的研究中的大学生。来自SJSU和USC的研究生将访问OSU的肯特实验室进行自己的分析，MIT研究生将访问SJSU并协助虾分析。四硕士SJSU的学生去了MIT在Pi Bowring和他的学生的指导下进行U-PB约会，预计这种类型的互动将继续。所有PI都经常将他们的研究纳入课堂讲座，并在实验室课程中使用研究样本。最重要的是，PI向新生的大型横截面展示了强烈的跨学科和协作工作的力量。