NERC-NSFGEO: Imaging the magma storage region and hydrothermal system of an active arc volcano

NERC-NSFGEO：对活弧火山的岩浆储存区域和热液系统进行成像

• 批准号: 2404029
• 负责人: Christine Chesley
• 金额: $ 31.51万
• 依托单位: Woods Hole Oceanographic Institution
• 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: 2024-09-01 至 2027-08-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2404029&HistoricalAwards=false
• 关键词: NERC; NSFGEO; Imaging; magma; storage

This project will collect electromagnetic data at Brothers volcano, the best-studied submarine volcano in the world. These data will image the inner workings of an active volcano and map fluid flow paths. Fluid flow leads to the precipitation of minerals that form heavy metal deposits. New and existing data will be integrated to estimate the amount of heavy metals deposited at this volcano. Broader impacts include engaging the public through a research cruise blog; training a researcher in electromagnetic methods and geophysical interpretation; presenting results in classrooms, at conferences, and to stakeholders; and building international partnerships through collaboration with colleagues from the US, UK, New Zealand, Germany, Italy, and Switzerland. 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.Hydrothermal fluid circulation is the key mechanism of chemical and thermal exchange between the solid Earth and oceans and plays an important role in volcanic hazard. Ocean drilling has provided important insights into the upper few hundred meters of submarine hydrothermal systems, but deeper fluid pathways and their relationship with the underlying magmatic heat source are poorly known. Partial melts, hydrothermal fluids and associated mineral deposits all have distinctive electrical resistivity. This project will conduct a unique electromagnetic experiment to image for the first time in three dimensions the inner workings of the hydrothermal system and underlying magma storage region of Brothers volcano, an active arc volcano. Brothers volcano is part of the Tonga-Kermadec arc and is the best-studied submarine arc volcano globally. During this experiment, two 3D grids of active-source electromagnetic data collected at Brothers volcano will be used to constrain the hydrothermal fluid flow paths and architecture of the magma plumbing system. The imaging will achieve a resolution that is impossible at terrestrial arc volcanoes and will reach depths beyond those accessible by drilling. The 3D resistivity models generated from this dataset will be integrated with seismic, magnetic, heat flow, and coring data to improve structural resolution of the subsurface and to more accurately apply empirical relationships to estimate porosity, permeability, sulfide mineralization, and melt fraction of the magma-hydrothermal systems.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.

该项目将在世界上研究最畅销的潜艇火山兄弟兄弟（Brothers Volcano）收集电子数据。这些数据将图像有源火山和地图流体流动路径的内部工作。流体流量导致形成重金属沉积物的矿物质的沉淀。新的和现有的数据将集成，以估计该火山沉积的重金属量。更广泛的影响包括通过研究邮轮博客与公众互动；培训研究人员电子方法和地球物理解释；在教室，会议和利益相关者中呈现结果；并通过与美国，英国，新西兰，德国，意大利和瑞士的同事合作建立国际伙伴关系。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一项联合提案，其调查员的预算比例最大。成功确定奖励建议后，每个机构都为支持其各自国家机构的科学家的预算比例提供了资金。水热流体循环是固体地球和海洋之间化学和热交换的关键机制，并在火山危险中起重要作用。海洋钻探为上部几百米的海底热液系统提供了重要的见解，但是更深的流体途径及其与基础磁热源的关系是鲜为人知的。部分熔体，水热流体和相关的矿物沉积物都具有独特的电阻。该项目将进行独特的电磁实验，以在三个维度上首次形象图像水热系统的内部运作和一个活跃的弧火山兄弟火山的基础岩浆存储区域。火山兄弟是汤加 - 凯尔马德弧的一部分，是全球最佳的潜艇弧线。在此实验中，在兄弟火山收集的有源源电磁数据的两个3D网格将用于限制岩浆管道系统的热液流体流动路径和结构。成像将达到陆地弧火山上不可能的分辨率，并将到达超出可通过钻孔的深度。该数据集产生的3D抗性模型将与地震，磁性，热流和加油数据集成，以改善地下的结构分辨率，并更准确地将经验关系应用于估计孔隙率，渗透率，硫化物矿化性，硫化物矿化和融化的融化，并通过质量宣布的质量授予NSF的基础，并以此为基础。优点和更广泛的影响审查标准。