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

在这一奖项下，PI提出了一项计算热力学研究，探索为什么MORB(和OIB)的主要元素化学似乎如此强烈地表明它们是橄榄岩地幔来源熔融的副产品，而不是玄武岩-榴辉岩来源，然而这些相同玄武岩及其熔体包裹体的同位素组成表明，它们的来源中存在重要的循环成分，至少一开始不是橄榄岩。该研究的第二部分是对扩展中心下熔体迁移过程的更全面的检查，探索与熔体迁移相关的潜在压力和应力变化，以及它们对熔融事件和熔体迁移过程的潜在反馈。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。

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.