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

地幔中化学不均匀性对环绕全球的洋中脊扩张中心喷发的熔岩化学的影响程度是海洋地质学和地球物理学界争论的热点。 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的地球化学趋势。 该项目的重点是离轴和转换熔岩从东太平洋隆起，由于其低岩浆补给率，应提供更好的指标未稀释地幔化学差异。 项目的目标是检查这些熔岩表现出直接从地幔或熔融聚合过程中混合继承的成分的程度。 岩浆挥发物，如H2O，CO2，S，F和Cl将在大约200个地球化学特征良好的熔岩从两个不同的地区附近的上升进行分析。 这些数据将与地球物理数据相结合，以确定岩浆的演变，以及是否可以确定它们代表了多少地幔成分。 这项工作的更广泛影响包括支持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。

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.