OCE-PRF: Melt Inclusions as Windows into Melt Generation and Crystallization Beneath Off-Axis Seamounts at Mid-Ocean Ridges

OCE-PRF：熔融包裹体作为大洋中脊离轴海山下方熔融生成和结晶的窗口

• 批准号: 1226130
• 负责人: Virginia Wanless
• 金额: $ 17万
• 依托单位: Wanless Virginia
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-09-01 至 2014-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1226130&HistoricalAwards=false
• 关键词: OCE; PRF; Melt; Inclusions; Windows

In this project, the investigator will explore the evolution of oceanic crust by analyzing the composition of the lava flows from off-axis seamounts near the Juan de Fuca Ridge. Oceanic crust is created at the axis of mid-ocean ridge spreading centers and is subsequently modified by off-axis volcanism. While mid-ocean ridge basalts erupted on-axis are typically relatively uniform in composition, off-axis seamounts erupt a wide range of compositions suggesting a complex system of melt generation, accumulation, and crystallization beneath these volcanic edifices. The investigator will use geochemical analyses of melt inclusions and associated glasses (including major, trace, and volatile elements) from lavas erupted at several seamounts to geochemically define the magmatic plumbing system beneath off-axis seamounts from melt generation to eruption on the seafloor. Results will be integrated with an ongoing study of melt inclusions at the adjacent ridge segment, which will provide a direct comparison between on- and off-axis magmatic systems at depth. Thus, the investigator will be able to systematically assess melt generation, accumulation, and the depth of crystallization beneath off-axis seamounts. The broader impacts include sponsoring an undergraduate student from an under-represented group to work on the research project as a summer intern, and graduate student mentorship. Findings from this project will be presented to the general public in an effort to inspire young scientists at "family science nights" at the New Bedford Ocean Explorium. Data and interpretations will be presented at international conferences. Once published, all data produced will be made available to the scientific community though incorporation into PetDB (www.petdb.org). This project is supported under the NSF Ocean Sciences Postdoctoral Research Fellowship (OCE PRF) program, with goals to support novel research by early career scientists and increase the diversity of the U.S. ocean sciences workforce and research community. With OCE-PRF support, this project will enable a promising early career researcher to establish themselves in an independent research career related to ocean sciences and broaden participation of under-represented groups in the ocean sciences.

在该项目中，调查员将通过分析胡安·德富卡海岭附近离轴海山熔岩流的成分，探索洋壳的演变。洋壳是在洋中脊扩张中心的轴上形成的，随后受到离轴火山作用的影响。轴上喷发的洋中脊玄武岩的成分通常相对均匀，而轴外海山喷发的成分则多种多样，这表明这些火山大厦下面存在着复杂的熔体生成、积累和结晶系统。调查员将利用对几个海山喷发的熔岩中的熔融包裹体和相关玻璃（包括主要元素、微量元素和挥发性元素）的地球化学分析，从地球化学角度确定离轴海山下从熔融生成到海底喷发的岩浆管道系统。结果将与正在进行的研究熔融包裹体在相邻的脊段，这将提供一个直接比较轴上和轴外岩浆系统的深度。因此，调查人员将能够系统地评估熔体的产生、积累和离轴海山下的结晶深度。更广泛的影响包括赞助一名来自代表性不足群体的本科生作为暑期实习生参与研究项目，以及研究生导师。该项目的研究结果将在新贝德福德海洋探索中心的“家庭科学之夜”上向公众展示，以激励年轻科学家。数据和解释将在国际会议上提出。一旦发表，所有产生的数据将通过纳入PetDB（www.petdb.org）提供给科学界。该项目得到了NSF海洋科学博士后研究奖学金（OCE PRF）计划的支持，其目标是支持早期职业科学家的新研究，并增加美国海洋科学劳动力和研究社区的多样性。在海洋环境组织-太平洋研究基金的支持下，该项目将使有前途的早期职业研究人员能够在与海洋科学有关的独立研究生涯中立足，并扩大代表性不足的群体对海洋科学的参与。