Collaborative Research: An Investigation into Relative Noble Gas Fractionation during Mantle Melting: Constraints fom the Southeast Indian Ridge

合作研究：对地幔熔融过程中相对惰性气体分馏的调查：来自东南印度洋中脊的限制

• 批准号: 9911418
• 负责人: Kenneth Farley
• 金额: $ 12.01万
• 依托单位: California Institute of Technology
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-04-01 至 2003-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9911418&HistoricalAwards=false
• 关键词: Collaborative; Research; Investigation; into; Relative

Award is for measuring He, Ne, and Ar noble gases and CO2 content on step-crushed basaltic quench glasses from the Southeast Indian Ridge (SEIR) to examine how noble gases fractionate in the mantle, knowledge essential to understanding mantle melt extraction and volatile transport. This work will also examine heterogeneity in mantle 40 Ar/36Ar, possibly arising from subduction of atmospheric Ar, and will also investigate the so-called He-paradox, wherey melt samples whose parental material originated from deep within the earth (characterized by high 3 He/4He and associated with mantle plumes) have low He aundances, as well as the He flux seemingly having little to do with heat flux from the mantle (as represented by magma production). Samples from the Southeast Indian Ridge have been chosen for the study as they show smooth variation in composition away from the Amsterdamm-St. Paul mantle plume that coincides with changes in ridge axial depth. These samples therefore represent a unique sample set to examine the influence on sub-oceanic mantle noble gas systematics by a deep mantle plume acting on the mantle processes underneath a spreading ridge.

该奖项是为了测量来自东南印度海脊(SEIR)的阶梯粉碎的玄武岩淬火玻璃上的He、Ne、Ar稀有气体和二氧化碳的含量，以研究稀有气体在地幔中的分馏情况，这是了解地幔熔体提取和挥发运输所必需的知识。这项工作还将研究可能由大气Ar俯冲引起的地幔40Ar/36Ar的不均一性，并将研究所谓的He悖论，即母质来自地球深处的熔体样品(以高3He/4He为特征，与地幔热柱有关)具有低的He含量，以及似乎与来自地幔的热通量(以岩浆产生为代表)无关的He通量。之所以选择来自东南印度洋海脊的样品进行研究，是因为它们的成分在远离阿姆斯特丹-圣彼得堡的地方表现出了平滑的变化。与海脊轴向深度变化相吻合的保罗地幔热柱。因此，这些样品是一套独特的样品，用来研究深部地幔热柱作用于扩张海脊下的地幔过程对海底地幔惰性气体系统学的影响。