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

合作研究：来自 EPR 的海山和内部转换熔岩的挥发性成分：解构 MORB 中的聚集过程

• 批准号: 0962109
• 负责人: Erik Hauri
• 金额: $ 5.78万
• 依托单位: Carnegie Institution of Washington
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-06-01 至 2013-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0962109&HistoricalAwards=false
• 关键词: Collaborative; Research; Volatile; Contents; Seamount

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.

地幔中的化学异质性在多大程度上影响了环绕地球的洋中脊扩散中心喷发的熔岩的化学成分，这是海洋地质学和地球物理学界热议的话题。 到目前为止，大多数工作都集中在表征和试图了解轴流熔岩的地球化学趋势。 该项目的重点是来自东太平洋海隆的离轴熔岩和转化熔岩，由于其低岩浆补给率，应该可以提供更好的未稀释地幔化学差异的指标。 项目目标是检查这些熔岩在多大程度上表现出直接继承自地幔或熔体聚合过程中混合的成分。 将在来自海隆附近两个不同区域的约 200 个地球化学特征良好的熔岩中分析 H2O、CO2、S、F 和 Cl 等岩浆挥发物。 这些数据将与地球物理数据相结合，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地幔成分。 这项工作的更广泛影响包括 EPSCoR 州机构的支持、国际（日本和法国）和机构间合作以及本科生培训。