The He-Ne-Ar-H2O-CO2 Isotope and Abundance Systematics of the Central Indian Ridge: Constraints on Plume-Ridge Interaction and the Degassing History of the Reunion Hotspot

中印度洋中脊的 He-Ne-Ar-H2O-CO2 同位素和丰度系统学：羽流-中脊相互作用的约束以及团聚热点的脱气历史

• 批准号: 0726573
• 负责人: David Hilton
• 金额: $ 20万
• 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: Standard Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-09-15 至 2012-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0726573&HistoricalAwards=false
• 关键词: He; Ne; Ar; H2O; CO2

ABSTRACT (Hilton)OCE-0726573Intellectual Merit: This research involves a detailed study of the isotope and abundance characteristics of magmatic volatiles in lavas from the Central Indian Ridge and its associated seamounts and fracture zones. The volatile characteristics of seafloor lavas provide key constraints on the structure and evolution of the Earth's mantle. The goal of the research is to use volatiles to decipher the evolution and degassing history of the Reunion hotspot as it impinges and interacts with the Central Indian spreading ridge to learn more about the mixing of magmas and plume-ridge interactions. The light rare gases (He, Ne and Ar) will be analyzed to determine volatile origins and mantle fluxes. Major gases (carbon dioxide and water) will provide controls on melting characteristics and degassing behavior. A detailed geophysical survey and dredging for volcanic glasses will be carried out in the Indian Ocean at four places on the Central Indian Ridge and its associated fracture zones and ridges. The geochemical sample suite will be supplemented by other samples from the region collected previously by two international groups (UK and France). These collaborators will also contribute expertise and analytical effort to the project. Noble gas-major volatile systematics of all samples will be carried out at Scripps Institution of Oceanography using a combination of crushing, stepped melting and laser probing. Major and trace element chemistry plus Sr-Nd-Pb-Hf-Th isotope work will be carried out by the international collaborators at no cost. Data will be used to improve out understanding of hotspot-ridge interactions and the dynamics of magma melting and movement at a locality where the hotspot is located oblique the ridge axis in contrast to Iceland where the hotspot is located on the ridge axis. Broader Impacts: Broader impacts of the work support the integration of research and education at every academic level from K-12 to post graduate work, including professional development for science educators in the informal, formal and community college settings. Activities that will be carried out include a staff professional development series at the Birch Aquarium at Scripps, professional development for high school Earth Sciences teachers, and presentations at community colleges. The work will support a female graduate student who will also act as the Chief Scientist on the cruise. There is also a strong international collaboration component with UK and French scientists.

摘要（希尔顿）OCE-0726573智力成果：这项研究包括对中印度洋脊及其相关海山和断裂带熔岩中岩浆挥发物的同位素和丰度特征的详细研究。海底熔岩的挥发性特征对地球地幔的结构和演化提供了关键的制约。 该研究的目标是使用挥发物来破译留尼汪热点的演化和脱气历史，因为它与中印度扩张脊相互作用，以了解更多关于岩浆混合和地幔柱-脊相互作用的信息。轻稀有气体（He，Ne和Ar）将被分析，以确定挥发物的来源和地幔通量。 主要气体（二氧化碳和水）将控制熔化特性和脱气行为。 将在印度洋中印度洋洋脊及其相关断裂带和洋脊的四个地方进行详细的地球物理调查和挖掘火山玻璃。地球化学样品组将得到两个国际小组（英国和法国）以前从该区域收集的其他样品的补充。 这些合作者还将为该项目提供专门知识和分析工作。将在斯克里普斯海洋学研究所采用破碎、分步熔化和激光探测相结合的方法对所有样品进行稀有气体主要挥发性系统分析。国际合作者将免费开展主要和微量元素化学以及Sr-Nd-Pb-Hf-Th同位素工作。 数据将被用来提高我们的理解热点脊相互作用和岩浆熔融和运动的动力学在一个地方，热点位于斜脊轴与冰岛的热点位于脊轴。更广泛的影响：这项工作的更广泛影响支持从K-12到研究生工作的各个学术层面的研究和教育的整合，包括非正式，正式和社区学院环境中科学教育工作者的专业发展。将开展的活动包括在斯克里普斯桦树水族馆举办的工作人员专业发展系列活动、高中地球科学教师的专业发展活动以及在社区学院的演讲。 这项工作将支持一名女研究生，她也将担任游轮上的首席科学家。 与英国和法国科学家也有很强的国际合作。