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)智力成果：这项研究探索了弧后火山作用的深层机制，以及这些构造环境中的火山链如何随时间变化以及它们与俯冲沟距离的影响。 将分析西太平洋劳盆地东北部岩石的全套地球化学数据，以了解主量元素和微量元素以及各种挥发性物质（例如 H2O 和 CO2）以及放射性同位素（Sr、Pb 和 Nd）的含量。 数据将用于测试含水量是否随距离海沟的距离而发生系统性变化，并确定弧后火山活动如何因缺乏火山前缘而受到影响。 地球化学数据还将用于研究路易斯维尔山脊火山链的俯冲是否导致了区域火山活动。 将对数据进行建模以确定熔化和岩浆源过程。 这项工作的结果将与 NSF 资助的位于劳盆地南部的 RIDGE 2000 主要研究地点的结果进行比较和对比。 更广泛的影响：这项工作的更广泛影响包括：两个机构之间的合作，其中一个机构位于 EPSCoR 州（俄克拉荷马州）、学生和博士后的教育和培训、国际合作以及在 Woods 使用 NSF 资助的多用户离子探针设施 霍尔海洋研究所。 还将针对 K-8 学童开展更多外展活动。