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

火山海岛屿引起了广泛的兴趣。它们远离大陆的影响，动植物遵循独特的进化路径，从海底升起的高大火山创造了非凡的海洋生态系统。它们的火山是由长期上升的地幔热柱形成的。形成这些岛屿的熔岩喷发包含有关地幔长期运动的地球化学线索。每座火山最终都会消亡，因为它被构造板块运动带离源头羽流，最终沉入海面以下。在这项研究中，将对之前从加拉帕戈斯岛链现已淹没的部分中发现的熔岩进行年龄和地球化学成分的分析。这些熔岩形成于500万至1000万年前。这项拟议的工作将测试地幔热柱的组成和融化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热柱的火山活动机制。这是伊萨卡学院和高露洁大学与GEOMAR(德国基尔)合作的一个联合项目。该项目直接投资于本科生的研究体验。学生将发展技能，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，以及管理数据集。在这项研究中，将对从东加拉帕戈斯地台和卡内基山脊(EGPCR)中发现的熔岩的年龄和成分进行分析。这些特征代表了当加拉帕戈斯羽流位于加拉帕戈斯扩张中心正下方时，纳斯卡板块上增厚的洋壳的5-10 Ma部分。该项目的主要目标是利用EGPCRa数据来解决关于羽流结构和动力学以及与羽流有关的岩浆活动停止后二次岩浆活动的程度的全球问题。这项拟议研究的活动将集中在高分辨率40Ar-39Ar辐射定年和从该地区恢复的现有岩石的主、痕量和锶-钕-铅-氢同位素比值分析。该项目直接投资于本科生研究体验，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。该项目还在德国基尔的GEOMAR的参与下加强了国际合作。这一奖项反映了NSF的法定使命，并通过使用基金会的智力优势和更广泛的影响审查标准进行评估，被认为值得支持。

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.