Collaborative Research: The role of water in the melting of oceanic mantle

合作研究：水在大洋地幔融化中的作用

• 批准号: 0623208
• 负责人: Erik Hauri
• 金额: $ 8.61万
• 依托单位: Carnegie Institution of Washington
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-10-01 至 2009-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0623208&HistoricalAwards=false
• 关键词: Collaborative; Research; role; water; melting

ABSRACT 0623238/ 0623208 (Kelley/Hauri)Intellectual Merit. The process of mantle melting and the generation of lavas are strongly influenced by H2O, but water plays apparently different roles depending on tectonic setting. This research addresses the role of water in the melting regime of a normal mid-ocean ridge far from the influence of subduction or plumes, as well as in ridges influenced by subduction. Hypotheses will be tested with geochemical analyses of mid-ocean ridge and back-arc basin basalt glasses that are already in-hand. This study will use the ion probe (SIMS) to develop high-spatial-resolution data sets of volatile (e.g., H2O, CO2, etc.) and trace elements for glasses from lavas from two seafloor spreading regimes: a normal mid-ocean ridge (East Pacific Rise) and four back-arc basins that transition between ridge and subduction zone systematics (the Woodlark, N. Fiji, Manus and Northern Lau basins). Using the data, a comprehensive model of the influence of H2O on the melting processes beneath normal mid-ocean ridges will be developed using MELTS. The model will then be tested within the framework of the four back-arc basins. Results ultimately should lead to a clearer model of how H2O influences the mantle melting process, how mantle temperature and volatile contents impact the composition and structure of the oceanic crust, and how H2O is distributed and transported throughout the earth's upper mantle.Broader Impacts. This research supports an early career female PI at the University of Rhode Island, which is in an EPSCoR state. The project also fosters national and international collaboration and supports one graduate student who will gain unique, hands-on analytical and modeling experience. Summer undergraduate interns will also be engaged in the research through an NSF REU program. The work is compatible with the NSF-funded RIDGE science plans and objectives.

Absract 0623238/0623208（Kelley/ Hauri）知识分子。地幔熔化的过程和熔岩的产生受H2O的强烈影响，但根据构造环境，水的作用显然不同。 这项研究探讨了水在正常的中山脊的熔化状态中的作用，远离俯冲或羽毛的影响以及受俯冲影响的脊。假设将通过已掌握的中山脊和后弧盆地盆地玻璃杯的地球化学分析进行测试。这项研究将使用离子探针（SIMS）开发高空间分辨率数据集的挥发性（例如H2O，CO2等）和来自两个海底散布方案的熔岩玻璃的微量元素：正常的中洋山脊（东太平洋崛起）和四个后弧盆地，它们在山脊和俯冲带系统之间过渡（伍德拉克，斐济，马努斯和北劳盆地）。使用数据，将使用熔体开发H2O对正常中山脊的熔化过程影响的综合模型。 然后将在四个背弧盆地的框架内测试该模型。最终，结果应导致更清晰的模型，即H2O如何影响地幔熔化过程，地幔温度和挥发性含量如何影响海洋壳的组成和结构，以及H2O如何分布和运输在地球上层地幔中。这项研究支持在埃普森州罗德岛大学的早期职业女性PI。 该项目还促进了国家和国际合作，并支持一位将获得独特，动手分析和建模经验的研究生。夏季本科实习生还将通过NSF REU计划进行研究。 这项工作与NSF资助的山脊科学计划和目标兼容。