RUI: An Investigation of the Mauna Kea Magma Plumbing System: Insights From Mineral Composition From the HSDP Core

斑晶提供了岩浆停滞和演化的压力和温度以及它们结晶的液体的档案。因此，斑晶成分可以用来创建岩浆管道系统的横截面，从而测试关于岩浆运输和液体演化的假设。特别是斜辉石斑晶，在破译方面非常有用，例如，如果硬玉的溶解度对压力敏感。该提案提供的资金将支持夏威夷科学钻探项目（HSDP2）对斜辉石成分进行为期两年的研究，目的是了解夏威夷莫纳克亚山的岩浆运输和液体演化。由于HSDP地核提供了一个独特的莫纳克亚岩浆管道系统的时间整合视图，PI和他的学生将研究结晶条件是否表现出时间模式。这一观点不仅有可能揭示岩浆管道系统的演化，而且斑晶成分也可能允许测试上涌羽流的成分或热分区的程度。加州州立大学弗雷斯诺分校的本科生和研究生将为该项目进行大部分数据分析。本科生的作用非常重要，因为经验表明，当学生参与一个更大的研究项目时，他们会特别有动力。在本研究中，将由一名研究生和几名本科生牵头收集和分析矿物化学数据。研究生将被分配更具挑战性的任务，重建液体成分，而一组本科生将进行P-T条件的估计。所有学生都将参与莫纳克亚火山岩浆管道系统模型的构建，并参与口头报告和出版工作。

PutirkaEAR-0337345Phenocrysts provide an archive of the pressures and temperatures at which magmas stagnate and evolve and the liquids from which they crystallized. Phenocryst compositions can thus be used to create a cross section of a magma conduit system, and thereby test hypotheses regarding magma transport and liquid evolution. Clinopyroxene phenocrysts, in particular, are extremely useful in deciphering, for instance, if the solubility of jadeite is sensitive to pressure. The funds provided by this proposal will support a two-year study of clinopyroxene compositions from the Hawaii Scientific Drilling Project (HSDP2), with the goal of understanding magma transport and liquid evolution at Mauna Kea, Hawaii. Since the HSDP core provides a unique time-integrated view of the Mauna Kea magma plumbing system, the PI and his students will examine whether the conditions of crystallization exhibit temporal patterns. Not only will this view potentially shed light on the evolution of a magma conduit system, but phenocryst compositions might also allow a test of the extent to which the upwelling plume is compositionally or thermally zoned.Both undergraduate and graduate students at California State University, Fresno, will perform much of the data analysis for this project. The role of undergraduates is very important, as experience has shown that students are particularly motivated when they are part of a larger research program. For the present study, a graduate and several undergraduate students will take the lead in the collection and analysis of the mineral chemistry data. The graduate student will be assigned the somewhat more challenging task of reconstructing liquid compositions, while a team of undergraduates will conduct the estimation of P-T conditions. All students will share in the construction of a model for the Mauna Kea magma plumbing system and with the oral presentation and publication efforts.