Reconciling Major Element Petrologic Constraints and Trace Element Isotopic Constraints on the Composition and Melting of the MORB Source

协调 MORB 源成分和熔化的主量元素岩石学约束和微量元素同位素约束

• 批准号: 0452867
• 负责人: Jason Phipps Morgan
• 金额: --
• 依托单位: Cornell University
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-02-15 至 2008-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0452867&HistoricalAwards=false
• 关键词: Reconciling; Major; Element; Petrologic; Constraints

Under this award, the PI proposes a computational thermodynamics study that explores why the major element chemistry of MORB (and OIB) so strongly seems to suggest they are the by product of melting a peridotite mantle source, not a basalt-eclogite source, yet the isotopic composition of these same basalts and their melt-inclusions suggest the presence of significant recycled components in their source that were not peridotites, at least to begin with. The second part of the study is a more complete examination of melt-migration processes beneath a spreading center that explores the potential pressure and stress changes associated with melt-migration, and their potential feedbacks for melting episodicity and melt transport processes. The study involves graduate students and other training activities, and that the results of the study will be broadly interesting to a wide community of scientists. In addition, the study involves international collaboration.

根据该奖项，PI提出了一项计算热力学研究，探讨为什么MORB（和OIB）的主要元素化学如此强烈地表明它们是橄榄岩地幔源熔融的副产品，而不是玄武岩-榴辉岩源，但这些相同玄武岩及其熔体包裹体的同位素组成表明在其来源中存在重要的再循环成分，而不是橄榄岩，至少在开始是这样。研究的第二部分是一个更完整的检查下的扩散中心，探讨与熔体迁移的潜在压力和应力变化，以及他们的潜在反馈熔化episodicity和熔体输送过程的熔体迁移过程。这项研究涉及研究生和其他培训活动，研究结果将引起广大科学家的广泛兴趣。此外，这项研究还涉及国际合作。