Continental and Convergent-Margin Volcanism: Isotopic Studies of Fluids and Rocks

这项拨款将继续支持稀有 气体和其他稀有气体的同位素， 热点上方，以及沿着会聚的板块边缘， 大陆裂谷 主要重点是3 He作为一种 地幔挥发分的“原始”示踪及其组合 甲烷和甲烷中碳的同位素组成， 二氧化碳。 3 He在火山熔岩中的宇宙成因性质一直是 它作为侵蚀研究中的示踪剂， 被证明。 高3 He/4 He比，相对于大洋中部 在太平洋的八个热点地区发现了脊玄武岩 地形，明确的证据表明，气体从较低的 上升的地幔柱耗尽地幔。 这些和类似类型的 利用稀有气体解决地幔化学问题的研究 和动力学将继续在PI的监督下进行。 这个奖项 将对已经收集的许多样品进行分析， 并将继续支持PI实验室的运作一年

This grant will provide continued support of research on rare gasses, and isotopes of other rare gasses, from volcanic centers over hot spots, and along convergent plate margins and continental rifts. Primary emphasis has been on 3He as a "primordial" tracer for mantle volatiles, and its association with methane and the isotopic composition of carbon in CH4 and CO2. The cosmogenic nature of 3He in volcanic lavas has been recognized and its usefulness as a tracer in erosion studies has been demonstrated. High 3He/4He ratios, relative to Mid-Ocean Ridge Basalts, have been identified in eight Pacific hotspot terrains, clear evidence of transport of gases from the less depleted mantle by rising plumes. These and similar types of research using rare gasses to solve problems of mantle chemistry and dynamics will continue under the PIs supervision. This award will provide for the analysis of many samples already collected, and will support the operation of the PI's lab for another year