Collaborative Research: Investigating Initiation and History of the Aleutian Arc and Composition and Significance of North Pacific Seafloor via Dredge Samples from the R/V Sonne

合作研究：通过 R/V Sonne 的挖泥船样本调查阿留申岛弧的起源和历史以及北太平洋海底的组成和意义

• 批准号: 1753492
• 负责人: Brian Jicha
• 金额: $ 12.36万
• 依托单位: University of Wisconsin-Madison
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2018
• 资助国家: 美国
• 起止时间: 2018-05-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1753492&HistoricalAwards=false
• 关键词: Collaborative; Research; Investigating; Initiation; History

Subduction is a fundamental tectonic process that shapes the Earth's physical and chemical evolution and has many important potential human impacts, including seismic and volcanic hazards, as well as mineral resources, which are common products of subduction magmatism. As a result, subduction-related processes are the subject of broad public interest and widespread investigation in the geosciences. Despite almost a century of research on the Alaska-Aleutian subduction system, several key questions remain unanswered including how and when the subduction zone was formed and to what extent the subducting Pacific plate contributes to the creation of magma generated beneath Alaska-Aleutian volcanoes. This project will allow a group of U.S. scientists from the University of South Carolina and the University of Wisconsin-Madison to precisely determine the timing of Aleutian arc formation and to characterize the products that are entering and have erupted from this active volcanic arc. This is a collaborative effort involving graduate and undergraduate students, post-docs, and researchers from Germany, Russia and the United States. All data from this project will be made available to the public. The project has two broadly related themes: 1) Constraining the timing of subduction initiation and early evolution of the Aleutian arc, and 2) Characterizing subduction inputs to both the Aleutian and Kamchatka arcs and relating them to the processes controlling arc magma formation. Analyses of samples from Expedition SO249 of the German R/V Sonne as part of the German-Russian BERING project will provide constraints on the timing of Aleutian arc formation and the geochemistry of the early arc products. The project will also obtain geochemical data for north Pacific seafloor samples adjacent to the western Aleutian arc, including sites both east and west of the northern Emperor seamounts. This study will help better understand geochemical linkages between subduction input and volcanic output, and will provide new constraints and significantly improve models of arc magma genesis for the Aleutians and Kamchatka.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

俯冲是一个基本的构造过程，它塑造了地球的物理和化学演化，并具有许多重要的潜在人类影响，包括地震和火山危害以及矿物资源，这些矿物资源是俯冲岩浆作用的常见产物。 结果，俯冲相关的过程是广泛的公共利益和地球科学中广泛调查的主题。尽管对阿拉斯加 - 阿拉斯加俯冲系统进行了近一个世纪的研究，但仍未解决几个关键问题，包括如何以及何时形成俯冲带，以及俯冲的太平洋板块在多大程度上有助于在阿拉斯加 - 阿拉斯加 - 阿拉斯加火山下产生的岩浆产生。该项目将允许南卡罗来纳大学和威斯康星大学麦迪逊分校的一群美国科学家精确地确定阿留申弧形的时机，并表征正在进入这款活跃火山弧的产品并爆发的产品。这是一项合作的努力，涉及毕业生和本科生，博士后以及来自德国，俄罗斯和美国的研究人员。该项目的所有数据都将向公众提供。该项目具有两个广泛相关的主题：1）限制俯冲启动的时间和阿留申弧的早期进化，以及2）表征对阿留申和坎奇特卡弧的俯冲输入，并将它们与控制弧形岩浆形成的过程有关。作为德国R/V SONNE的Expedition SO249的样品作为德国俄罗斯白令项目的一部分的分析，将对Aleutian ARC形成和早期ARC产品的地球化学的时机提供限制。该项目还将获取与西部阿留申弧相邻的北太平洋海底样品的地球化学数据，包括北部皇帝海底的东部和西部。这项研究将有助于更好地理解俯冲输入和火山产出之间的地球化学联系，并将提供新的约束，并显着改善Aletarians和Kamchatka的Arc Magma Genesis的模型。这一奖项反映了NSF的法定任务，并通过使用基金会的知识优点和广泛的影响来评估NSF的法定任务。