Detailed Study Of Focused Melt Transport In The Upper Mantle Section Of The Oman Ophiolite

这是一项由私人投资机构和一名博士生继续开展阿曼蛇绿岩地幔部分工作的提案，该博士生的工资是该提案要求的主要项目。这项研究的重点是纯橄榄石静脉的研究，学生(迈克尔·布劳恩)将测量它们的大小、分布、丰度、微观结构，并在实验室中测量它们的组成。其目的是提供关于MORB岩浆如何从地幔中提取、熔体在地幔中迁移过程中反应性多孔流动的流体动力学以及这些过程如何影响地幔流变性的定量约束。具体地说，这些新的研究将探讨方辉橄榄石在纯橄榄石海峡中流动时有多少熔体流过的问题。主要的想法是在两种可能的尘埃来源之间进行测试；裂缝周围的反应光晕和扩散渗透。这项工作是对阿曼下地壳段PI研究的补充，并可应用于洋壳起源的研究。

This is a proposal for continued work on the mantle section of the Oman ophiolite by the PIs and a PhD student whose salary is the major item requested in this proposal. The study is focused on the study of dunite veins and the student (Michael Braun) will measure their size, distribution, abundance, microstructures, and, in the lab, their compositions. The aim is to provide quantitative constrains on how MORB magma is extracted from the mantle, the fluid dynamics of reactive porous flow during melt migration through the mantle, and how these processes affect mantle rheology. Specifically, these new studies will approach the question of how much melt has flowed through harzburgite as they travel in dunite channels. The main idea is to test between two possible origins of the dunites; reaction haloes around cracks vs. diffusive infiltration. This work complements studies by the PIs of the lower crust sections in Oman and has application for studies of the origin of ocean crust.