Mechanisms of Mantle Convection and Magma Migration

这项研究有两个主要推动力。第一个是支持首席研究员与巴黎大学克劳德·阿莱格雷教授在解释地幔对流和相关过程中的同位素和其他地球化学数据方面的合作。其目的是了解地幔动力学如何导致大洋中脊玄武岩、洋岛玄武岩、岛弧火山作用和大陆火山作用的地球化学特征。重要的问题包括：地幔对流是否分层？陆壳是否有重大的再循环作用进入地幔？层状俯冲的大洋岩石圈是否重新混入上地幔储集层？高温橄榄岩是“大理石蛋糕”地幔的例子这一假设将通过野外、实验室和理论研究相结合的方式进行研究。拟议研究的第二个主要目的是支持首席调查员与帝国理工学院大卫·斯宾塞教授在岩浆破裂力学方面的合作。岩浆断裂是岩浆运移的主要机制，也是岩脉和岩床的来源。这也是马尔斯火山和金伯利岩喷发的机制。将研究浮力驱动的岩浆裂缝，以及不断扩展的裂缝中岩浆迁移的热方面。

There are two main thrusts to the research. The first is to support collaboration between the Principal Investigator and Professor Claude Allegre, University of Paris, on the interpretation of isotopic and other geochemical data in terms of mantle convection and related processes. The object is to understand how mantle dynamics leads to the geochemical signatures of mid ocean ridge basalt, ocean island basalts, island arc volcanism, and continental volcanism. Important questions include: Is mantle convection layered? Is there significant recycling of continental crust into the mantle? Is the layered, subducted oceanic lithosphere remixed into the upper mantle reservoir? The hypothesis that high-temperature peridotites are examples of a "marble-cake" mantle will be studied with a combination field, laboratory, and theoretical studies. A second major thrust of the proposed research is to support collaboration between the Principal Investigator and Professor David Spence, Imperial College, on the mechanics of magma fracture. Magma fracture is a major mechanism for the transport of magma as well as the origin of dikes and sills. It is also the mechanism responsible for maars and kimberlite eruptions. Buoyancy driven magma fractures will be studied as will the thermal aspects of magma migration in propagating fractures.