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

摘要（Hilton） oe -0726573学术价值：本研究详细研究了印度中脊及其伴生海山和断裂带火山岩中岩浆挥发物的同位素和丰度特征。海底熔岩的挥发性特征为地幔的结构和演化提供了关键的约束条件。这项研究的目标是利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碰撞和相互作用，以了解更多关于岩浆混合和羽状脊相互作用的信息。将分析轻稀有气体（He， Ne和Ar），以确定挥发性来源和地幔通量。主要气体（二氧化碳和水）将控制熔化特性和脱气行为。将在印度洋中印度脊及其相关断裂带和脊上的四个地方进行详细的地球物理调查和火山玻璃疏浚。地球化学样品组将由两个国际小组（英国和法国）先前从该地区收集的其他样品补充。这些合作者还将为项目贡献专业知识和分析工作。所有样品的惰性气体主要挥发分系统将在斯克里普斯海洋学研究所进行，使用破碎，阶梯熔化和激光探测相结合的方法。主要和微量元素化学以及Sr-Nd-Pb-Hf-Th同位素工作将由国际合作者免费进行。数据将用于提高我们对热点-山脊相互作用的理解，以及在热点位于山脊轴斜的地方的岩浆融化和运动动力学，而冰岛的热点位于山脊轴上。更广泛的影响：这项工作的更广泛影响支持从K-12到研究生工作的每个学术水平的研究和教育的整合，包括非正式、正式和社区大学环境中的科学教育者的专业发展。将开展的活动包括斯克里普斯伯奇水族馆的员工专业发展系列，高中地球科学教师的专业发展，以及社区大学的演讲。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的国际合作也很重要。

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.