Collaborative Research: The Volatile Contents of Seamount and Intra-Transform Lavas from the EPR: Deconstructing the Aggregation Process in MORB

地幔化学不均质性对大洋中脊扩张中心喷发的熔岩化学有多大影响，是海洋地质界和地球物理界争论的热点。到目前为止，大多数工作都集中在表征和试图了解轴向熔岩中的地球化学趋势。该项目的重点是东太平洋隆起的离轴和改造熔岩，由于它们的岩浆补给率较低，应该能更好地指示未稀释的地幔化学差异。项目目标是检查这些熔岩在多大程度上显示出在熔体聚集过程中直接从地幔继承或从混合中继承的成分。将在隆起附近两个不同地区的大约200个地球化学性质良好的熔岩中分析岩浆挥发分，如H2O、CO2、S、F和Cl。这些数据将与地球物理数据结合起来，以确定岩浆的演化，以及是否可以确定它们代表了多少起源的地幔成分。这项工作的更广泛影响包括对EPSCoR国家的机构、国际(日本和法国)和机构间合作以及本科生培训的支持。

The degree to which chemical heterogeneity in the mantle affects the chemistry of lavas erupted on the spreading centers of the globe-encircling mid-ocean ridge is a topic of hot debate in the marine geology and geophysics community. Up until now, most work has focused on characterizing and trying to understand geochemical trends in axial lavas. This project focuses on off-axis and transform lavas from the East Pacific Rise which, due to their low magma recharge rates, should provide better indicators of undiluted mantle chemical differences. Project goals are to examine the extent to which these lavas exhibit compositions inherited directly from the mantle or from mixing during melt aggregation. Magmatic volatiles such as H2O, CO2, S, F, and Cl will be analyzed in about 200 geochemically well-characterized lavas from two different areas near the Rise. These data will be combined with geophysical data to determine the evolution of the magmas and whether it can be determined how much of the mantle composition of origin they represent. Broader impacts of the work include support of an institution in an EPSCoR state, international (Japan and France) and inter-institutional collaboration, and undergraduate training.