Rare Gases in Samoan Xenoliths

萨摩亚捕虏体中的稀有气体

• 批准号: 9105032
• 负责人: Robert Poreda
• 金额: $ 5.3万
• 依托单位: University of Rochester
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-06-01 至 1992-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9105032&HistoricalAwards=false
• 关键词: Rare; Gases; Samoan; Xenoliths

This is a study of the rare gas isotope systematics of residual xenoliths from three islands within the Samoan hotspot chain. The xenoliths occur in post-erosional volcanics and are apparently the residual mantle remaining after extraction of the basaltic lava which formed the Samoan shield volcanoes. Rare gases (He, Ne, Ar and Xe) will be used to determine the evolution of the mantle source for Samoa and the processes occurring during melt formation and segregation. Rare gas analysis of individual mineral phases, plus interstitial glass will employ a variety of extraction techniques, including vacuum crushing, fusion by conventional step-heating, and laser fusion of individual mineral grains. The Samoan xenoliths are extremely gas-rich, and accurate He and Ar isotopic analysis can be obtained on single crystals of 5 mg. The study should lead to a better understanding of the processes involved in the extraction of volatiles from mantle peridotites during the formation of a basaltic melt.

本文研究了残馀气的稀有气体同位素体系 来自萨摩亚热点链内三个岛屿的捕虏体。 捕虏体产于侵蚀后火山岩中， 显然，在提取了 形成萨摩亚盾状火山的玄武熔岩 罕见 气体（He，Ne，Ar和H2O）将用于确定演化 萨摩亚的地幔源和过程发生在 熔体形成和偏析。 单个稀有气体分析 矿物相，加上填隙玻璃将采用各种 提取技术，包括真空粉碎，熔融， 传统的分步加热和单个矿物的激光熔融 晶粒 萨摩亚捕虏体富含天然气， He和Ar同位素分析可以在单一的 晶体5 mg。 这项研究应该会带来一个更好的 了解在提取过程中所涉及的 地幔橄榄岩的挥发分， 玄武岩熔体