Collaborative Research: RUI: The Effect of a Mid-Ocean Ridge-Centered Environment on a Zoned Mantle Plume and Associated Secondary Magmatism

合作研究：RUI：以大洋中脊为中心的环境对分区地幔柱及相关次生岩浆作用的影响

• 批准号: 2018275
• 负责人: Christopher Sinton
• 金额: $ 8.33万
• 依托单位: Ithaca College
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-05-15 至 2024-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2018275&HistoricalAwards=false
• 关键词: Collaborative; Research; RUI; Effect; Mid

Volcanic ocean islands are of wide interest. Placed far from the influence of continents, their flora and fauna followed unique evolutionary pathways and their tall volcanoes rising from the seafloor create extraordinary marine ecosystems. Their volcanoes are generated from long-lived rising plumes of hot mantle. The lavas that erupt to form these islands contain geochemical clues about long-term movements of the mantle. Each volcano eventually becomes extinct as it is transported away from its source plume by tectonic plate motion, eventually subsiding below the sea surface. In this study, lavas previously recovered from the now drowned part of the Galapagos island chain that formed between 5 and 10 million years ago will be analyzed for age and geochemical composition. The proposed work will test models of how mantle plume composition and melting can change over space and time. The work will also investigate mechanisms of volcanism that occur away from the mantle plume. This is a joint project between Ithaca College and Colgate University in collaboration with GEOMAR (Kiel, Germany). The project invests directly in undergraduate research experiences. The students will develop skills such as conducting a search for background information, discussing/focusing research questions, learning new analytical techniques, learning about data quality control, and managing datasets. In this study, the age and composition of lavas recovered from the Eastern Galápagos Platform and Carnegie Ridge (EGPCR) will be analyzed for their age and composition. These features represent the 5-10 Ma portion of the thickened oceanic crust on the Nazca plate created when the Galápagos plume was located directly below the Galápagos Spreading Center. The primary goal of this project is to use the EGPCR data to address global questions about plume structure and dynamics and the extent of secondary magmatism after plume-related magmatism has ceased. The activities for this proposed study will focus on high resolution 40Ar-39Ar radiometric dating and major, trace, and Sr-Nd-Pb-Hf isotopic ratio analysis of existing rocks recovered from the region. This project invests directly in undergraduate research experiences where four undergraduate students from Ithaca College and Colgate University will perform laboratory work during the summers and continue during the academic year. The project also enhances international cooperation with the involvement of at GEOMAR in Kiel, Germany.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.

火山海洋岛屿引起了广泛的兴趣。由于远离大陆的影响，这里的动植物遵循着独特的进化路径，从海底升起的高大火山创造了非凡的海洋生态系统。它们的火山是由长时间上升的热地幔柱形成的。喷发形成这些岛屿的熔岩包含了地幔长期运动的地球化学线索。每座火山最终都会因为板块运动而远离源头，最终沉降到海面以下而灭绝。在这项研究中，先前从加拉帕戈斯岛链中现在被淹没的部分恢复的熔岩形成于500万到1000万年前，将被分析年龄和地球化学成分。这项提议的工作将测试地幔柱组成和融化如何随时间和空间变化的模型。这项工作还将研究远离地幔柱的火山活动的机制。这是伊萨卡学院和科尔盖特大学与GEOMAR（德国基尔）合作的一个联合项目。该项目直接投资本科生的研究经历。学生将培养诸如搜索背景信息、讨论/聚焦研究问题、学习新的分析技术、学习数据质量控制和管理数据集等技能。本研究将对东部Galápagos台地和卡内基岭（EGPCR）恢复的熔岩进行年龄和组成分析。这些特征代表了当Galápagos羽流位于Galápagos扩张中心正下方时，纳斯卡板块上增厚的海洋地壳的5-10 Ma部分。该项目的主要目标是利用EGPCR数据来解决有关羽流结构和动力学以及羽流相关岩浆活动停止后次级岩浆活动程度的全球问题。这项研究的活动将集中在高分辨率的40Ar-39Ar放射性定年以及从该地区回收的现有岩石的主要、痕量和Sr-Nd-Pb-Hf同位素比分析。该项目直接投资于本科生研究经验，来自伊萨卡学院和科尔盖特大学的四名本科生将在夏季进行实验室工作，并在学年期间继续进行。该项目还在德国基尔GEOMAR的参与下加强了国际合作。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。