Noble Gas Studies of the Oceanic Mantle

9618101库尔茨这项研究的总体目标是利用大洋火山岩中的稀有气体分布和同位素组成来限制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，如锶、钕和铅同位素联系起来。特别令人感兴趣的是一套来自超快速蔓延的东太平洋隆起和附近海山的大洋玄武岩玻璃，它们被极好地记录下来，是研究惰性气体的理想之选。激光提取技术将能够直接检查大洋中脊和大洋岛屿的个别样品中的惰性气体分布，从而确定地幔火山岩中的惰性气体居住地，并限制重要的地幔矿物相中惰性气体的相容程度。这些数据还将有助于限制大洋中脊下的融化动力学和海山形成的机制。

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