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和相关次级岩浆作用的影响

• 批准号: 2018283
• 负责人: Karen Harpp
• 金额: $ 11.59万
• 依托单位: Colgate University
• 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 2025-01-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2018283&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.

火山海岛引起了广泛关注。他们的动植物远离继续的影响，遵循独特的进化途径，从海底升起的高火山创造了非凡的海洋生态系统。它们的火山是由长寿命上升的热地幔产生的。爆发形成这些岛屿的熔岩包含有关地幔长期运动的地球化学簇。每个火山最终都会灭绝，因为它通过构造板运动从源羽流中运输，最终在海面下方逐渐消失。在这项研究中，熔岩先前从现在在5到1000万年前形成的加拉帕戈斯岛链的部分中恢复过来，将分析年龄和地球化学成分。拟议的工作将测试地幔羽状成分和熔化如何在时空和时间上发生变化的模型。这项工作还将研究发生的火山主义机制。从地幔羽流。这是与Geomar（德国基尔）合作的伊萨卡学院和高露洁大学之间的联合项目。该项目直接投资于本科研究经验。学生将开发技能，例如进行搜索背景信息，讨论/关注研究问题，学习新的分析技术，学习数据质量控制以及管理数据集。在这项研究中，将分析从Galápagos平台和Carnegie Ridge（EGPCR）回收的熔岩的年龄和组成，以分析其年龄和组成。这些功能代表了纳斯卡板上加增稠的海壳的5-10 mA部分，当时Galápagos羽流在Galápagos蔓延中心正下方时产生。该项目的主要目的是使用EGPCR数据来解决有关羽流结构和动态的全球问题，以及与羽流相关的岩浆作用后的次级岩浆症的程度已停止。这项拟议的研究的活动将集中于高分辨率40AR-39AR辐射测定，以及对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研究经验，其中四个来自伊萨卡学院和高露洁大学的本科生将在夏季进行实验室工作，并在学年中继续进行实验室工作。该项目还加强了国际合作，并参与了德国基尔的Geomar的参与。该奖项反映了NSF的法定任务，并使用基金会的知识分子优点和更广泛的影响评估标准，被视为通过评估来获得珍贵的支持。