Collaborative Research: RUI: THE EFFECT OF A MID-OCEAN RIDGE-CENTERED ENVIRONMENT ON A ZONED MANTLE PLUME AND ASSOCIATED SECONDARY MAGMATISM

火山洋岛屿具有广泛的兴趣。远离大陆的影响，其植物群和动物群遵循独特的进化途径，从海底升起的高大火山创造了非凡的海洋生态系统。它们的火山是由长期存在的热地幔柱上升产生的。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构造板块运动而远离其源柱而熄灭，最终沉入海面以下。在这项研究中，以前从加拉帕戈斯岛链的淹没部分恢复的熔岩形成于500万至1000万年前，将分析其年龄和地球化学成分。拟议的工作将测试地幔柱成分和熔融如何随空间和时间变化的模型。这项工作还将研究远离地幔柱的火山活动机制。这是伊萨卡学院和高露洁大学与GEOMAR（基尔，德国）合作的一个联合项目。该项目直接投资于本科生的研究经验。学生将发展技能，如进行搜索背景信息，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。在这项研究中，将分析从东加拉帕戈斯地台和卡内基海岭（EGPCR）回收的熔岩的年龄和成分。这些特征代表了纳斯卡板块上增厚的洋壳的5-10 Ma部分，当加拉帕戈斯羽位于加拉帕戈斯扩张中心正下方时形成。该项目的主要目标是利用EGPCR数据解决全球性问题，即羽流结构和动力学以及与羽流有关的岩浆活动停止后次生岩浆活动的程度。这项拟议研究的活动将侧重于高分辨率40 Ar-39 Ar放射性测年和主要，微量和Sr-Nd-Pb-Hf同位素比值分析从该地区回收的现有岩石。该项目直接投资于本科生的研究经验，来自伊萨卡学院和高露洁大学的四名本科生将在夏季进行实验室工作，并在学年继续进行。该项目还加强了在德国基尔的GEOMAR的参与下的国际合作。该奖项反映了NSF的法定使命，并被认为值得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来支持。

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.