Noble Gas Studies of the Oceanic Mantle

本研究的总体目标是利用海洋火山岩中的稀有气体分布和同位素组成来约束地幔的长期脱气行为。新的测量将把氦的各向同性变化与较重的稀有气体（特别是Ne、ar和Xe）以及其他地球化学示踪剂（如Sr、Nd和Pb同位素）联系起来。特别令人感兴趣的是一套来自超快速扩张的东太平洋隆起的海洋玄武岩玻璃，以及附近的海山，它们被记录得非常好，是稀有气体研究的理想场所。激光提取技术可以直接检测大洋中脊和大洋岛屿单个样品中的稀有气体分布，从而确定地幔衍生火山岩中稀有气体的居住地，并限制重要地幔矿物相中稀有气体的相容性程度。这些数据还将有助于限制大洋中脊下的融化动态，以及海山形成的机制

9618101 Kurz The overall goal of this research is to use the noble gas distribution and isotopic compositions in oceanic volcanic rocks to constrain the long-term degassing behavior of the earth's mantle. New measurements will related helium isotropic variations to the heavier noble gases (particularly Ne, ar, and Xe) as well as other geochemical tracers such as Sr, Nd, and Pb isotopes. Of particular interest is a suite of oceanic basalt glasses from the super-fast spreading East Pacific Rise, and the nearby seamounts, which are extremely well documented and are ideal for the noble gas studies. Laser extraction techniques will allow direct examination of the noble gas distribution within individual samples from the mid-ocean ridges and oceanic islands, thus identifying the noble gas residence sites in mantle derived volcanic rocks and constraining the degree of noble gas compatibility within important mantle mineral phases. The data will also help constrain the dynamic of melting beneath the mid ocean ridges and the mechanisms by which seamounts are formed.1