Collaborative Research: Geochemical investigations of newly discovered back-arc spreading centers in the northeastern Lau Basin

合作研究：劳盆地东北部新发现的弧后扩张中心的地球化学调查

• 批准号: 0751844
• 负责人: Charles Langmuir
• 金额: $ 20.87万
• 依托单位: Harvard University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-04-01 至 2011-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0751844&HistoricalAwards=false
• 关键词: Collaborative; Research; Geochemical; investigations; newly

ABSTRACT-0751844/0752256 (Langmuir/Michael)Intellectual Merit: This research explores the deep-seated mechanisms that underlie back-arc volcanism and how volcanic chains in these tectonic settings change over time and are influenced by their distance from a subduction trench. A full suite of geochemical data from rocks in the northeastern Lau Basin in the western Pacific Ocean will be analyzed for major and trace elements as well as for the content of various volatile species such as H2O and CO2 and the radiogenic isotopes: Sr, Pb, and Nd. Data will be used to test whether there are systematic variations in water content with distance from the trench and determine how back-arc volcanism is affected by the lack of a volcanic front. Geochemical data will also be used to examine whether subduction of the Louisville Ridge volcanic chain is contributing to regional volcanism. Data will be modeled to determine melting and magmatic source processes. Results of the work will be compared and contrasted to those from the major NSF-funded RIDGE 2000 study site in the Lau Basin to the South.Broader Impacts: Broader impacts of the work include: collaboration between two institutions, one of which is in an EPSCoR state (Oklahoma), education and training of students and a postdoc, international collaboration, and the use of an NSF-funded multi-user ion probe facility at the Woods Hole Oceanographic Institution. Additional outreach to K-8 school children will also be undertaken.

摘要-0751844/0752256（Langmuir/Michael）知识分子：这项研究探讨了背面火山的基础的深度座位机制以及这些构造环境中的火山链如何随着时间的推移而变化，并且会受到与俯冲沟槽距离的距离的影响。 将分析来自西太平洋东北部Lau盆地岩石的全套地球化学数据，以分析主要和微量元素，以及各种挥发性物种的含量，例如H2O和CO2，以及放射性同位素：SR，PB和ND。 数据将用于测试与沟槽距离的水含量有系统的变化，并确定缺乏火山阵线的后弧形火山的影响。 地球化学数据还将用于检查路易斯维尔山脊火山链的俯冲是否有助于区域火山。 数据将建模以确定熔融和岩浆源过程。 该工作的结果将被比较并与来自NSF主要资助的Ridge 2000研究地点的研究站点进行比较并形成对比。Broader的影响：这项工作的更广泛影响包括：两个机构之间的协作，其中一个是Epscor State（Oklahoma）（俄克拉荷马州），教育和训练的学生和国际协作，以及国际合作，以及国际合作的NS Funder and n ssf Fund of nors of nors Fund of n sf-fund of n sf-fund of n n n n n n n sf-fund，孔海洋学机构。 还将对K-8学童的其他宣传也将进行。