Along-Axis Variations in Magma Production and Delivery at Slow & Intermediate Spreading Ridges: Constraints from Theoretical Modeling & Field Observations in the Troodos O

科学总结。在这项拟议的研究中，Fialko与Staudigel合作，他们提出了对Troodos蛇绿岩的垂直和横向筑堤的综合实地和理论研究，预期应用于中等和缓慢扩展的洋中脊。本研究报告有三个相互关联的部分。首先，筑堤的理论模型将得到改进，一些初始简化将放宽，希望产生更适用于自然环境的结果。新的模型将纳入更广泛的岩浆超压和沿轴地形坡度和构造应力。此外，PI将包括一些热效应，如温度依赖的岩浆流变学。在研究的第二部分，PI和一名学生将汇编来自Troodos蛇绿岩的岩脉的现有现场数据，并获取新的现场和实验室数据，以限制垂直与横向侵入的岩浆量。他们还将完善现有的侵入中心模型和岩浆（和化学）不同系统的行为之间的区别。最后，在第三部分中，Troodos数据将与第一部分中开发的模型相结合，以生成中等和缓慢扩展的山脊的筑堤行为的正演模型。许多自然现象可以用这些模型来探索，以更深入地了解岩浆是如何向山脊集中的，筑堤的频率和体积关系，以及山脊的岩浆和构造分段。

Science Summary. In this proposed study, Fialko has teamed with Staudigel and they propose a combined field and theoretical study of vertical and lateral diking at the Troodos ophiolite with expected applications to medium and slow spreading mid-ocean ridges. The study has three connected parts. First, theoretic models of diking will be improved and some initial simplifications will be relaxed to hopefully yield results more applicable to natural settings. New models will incorporate a wider range of magmatic overpressures and along-axis topographic slopes and tectonic stress. In addition, the PI will incorporate some thermal effects such as temperature dependent magma rheology. In the second part of the study, the PIs and a student will compile existing field data for dikes from the Troodos ophiolite, and acquire new field and lab data to constrain the amounts of magma that are intruded vertically versus laterally. They will also refine existing models of intrusive centers and distinctions between the behaviors of magmatically (and chemically) distinct systems. Finally, in the third part, the Troodos data will be combined with the models developed in the first part to produce forward models for the diking behavior of medium and slow-spreading ridges. A number of natural phenomena can be explored with these models to gain a deeper understanding of how magma is focused toward ridges, the frequency and volume relations of diking, and magmatic and tectonic segmentation of ridges.