Collaborative Research: NSFGEO-NERC: Magnetotelluric imaging and geodynamical/geochemical investigations of plume-ridge interaction in the Galapagos

合作研究：NSFGEO-NERC：加拉帕戈斯群岛羽流-山脊相互作用的大地电磁成像和地球动力学/地球化学研究

• 批准号: 2334542
• 负责人: Steven Constable
• 金额: $ 59.27万
• 依托单位: University of California-San Diego Scripps Inst of Oceanography
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2024
• 资助国家: 美国
• 起止时间: 2024-07-01 至 2027-06-30
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2334542&HistoricalAwards=false
• 关键词: Collaborative; Research; NSFGEO; NERC; Magnetotelluric

How magma flows from the Earth’s mantle to the surface is poorly understood. Does it flow slowly through the mantle, or quickly through melt-rich channels? Answering this question will help understand where seafloor volcanoes form and how frequently they erupt. The project will acquire new geophysical and geological data in the Galapagos islands. This region has volcanism all the way from the main archipelago to the mid-ocean ridge a few hundred km away. The investigators will combine the new data with theoretical modeling to test different models for magma flow. The results will be important for other locations such as Reunion Island, Azores Islands, and Easter Island as well as global subduction zones. Broader impacts include support and training of a graduate student and postdoctoral scholar, opportunities for early career scientists to participate in the research cruise, collaboration with the Charles Darwin Foundation in Galapagos, and outreach to the public and K-12 students. This is a project jointly funded by the National Science Foundation’s Directorate for Geosciences (NSF/GEO) and the National Environment Research Council (NERC) of the United Kingdom (UK) via the NSF/GEO-NERC Lead Agency Agreement. This Agreement allows a single joint US/UK proposal to be submitted and peer-reviewed by the Agency whose investigator has the largest proportion of the budget. Upon successful joint determination of an award recommendation, each Agency funds the proportion of the budget that supports scientists at institutions in their respective countries.The proposed works aims to significantly improve the understanding of melt transport in the asthenosphere, and melt localization processes, through an integrated multidisciplinary study. As a case study, the project will focus upon mantle plume/mid-ocean ridge interaction in the Galapagos which is exemplified by the enigmatic Wolf-Darwin Lineament. The proposed work includes three key components: (1) New marine resistivity imaging using magnetotelluric data sets for imaging melt distribution (with deployment of 90 ocean bottom broadband MT sites); (2) Geochemical analysis (major and trace elements, volatile content, Sr, Nd, Pb and Fe isotopes) of existing and new dredge samples along the northern Galapagos lineaments and Western Galapagos Spreading Center; and (3) Geodynamical modeling of two-phase melt channelization to constrain the physical viability of melt localization. These results will be integrated to generate a new global model for plume-ridge interaction and asthenospheric melt transport in general.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.

岩浆如何从地球地幔流向表面的方式知之甚少。它是缓慢地流过地幔还是迅速地通过熔融丰富的通道？回答这个问题将有助于了解海底火山形成的位置以及它们爆发的频率。该项目将在加拉帕戈斯群岛获取新的地球物理和地质数据。从主要群岛到几百公里的海洋山脊，该地区一直都有火山。研究人员将将新数据与理论建模相结合，以测试岩浆流的不同模型。结果对于其他地点，例如团聚岛，亚速尔群岛和复活节岛以及全球俯冲带很重要。更广泛的影响包括对研究生和博士后科学的支持和培训，早期职业科学家参加研究巡航的机会，与加拉帕戈斯的Charles Darwin基金会合作以及向公众和K-12学生宣讲。这是一个由国家科学基金会地球科学局（NSF/GEO）和英国国家环境研究委员会（NERC）共同资助的项目，该项目通过NSF/GEO-GEO-NERC领先机构协议。该协议允许该机构提交和同行评审的单一联合提案，其调查人员在成功地共同确定奖励建议的情况下拥有最大比例，每个机构为支持其各自国家机构的科学家的预算比例提供了资金。拟议的工程旨在通过构成群组的整体构成和梅尔特的整体化进程，旨在显着改善对梅尔特运输的多大改进。作为一个案例研究，该项目将集中在加拉帕戈斯群岛中的地幔羽流/中山脊相互作用上，这是由神秘的狼 - 戴文族人来体现的。拟议的工作包括三个关键组成部分：（1）使用磁铁数据集用于成像熔体分布（部署了90个海洋底部宽带MT位点）的新型海洋耐药成像； （2）沿北加拉帕戈斯河沿北部和新的疏edge样品的地球化学分析（主要和痕量元素，挥发性含量，SR，ND，PB和Fe同位素）以及新的疏edge样品以及西加拉帕戈斯传播中心； （3）两相熔体通道的地球动力学模型，以限制熔体定位的物理生存能力。这些结果将集成以生成新的全球模型，用于一般而言，用于羽毛岩相互作用和动态层熔体转运。该奖项反映了NSF的法定任务，并通过使用基金会的知识分子优点和更广泛的影响审查标准来评估被认为是宝贵的支持。