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: 0962195
• 负责人: Alberto Saal
• 金额: $ 20.47万
• 依托单位: Brown University
• 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=0962195&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.

地幔的化学非均质性在多大程度上影响了环绕地球的洋中脊扩张中心喷发的熔岩的化学性质，这是海洋地质学和地球物理学界争论的热点问题。到目前为止，大多数工作都集中在描述和试图理解轴向熔岩的地球化学趋势上。该项目重点研究了东太平洋隆起的离轴熔岩和转化熔岩，由于它们的岩浆补给速率较低，应该能更好地指示未稀释的地幔化学差异。该项目的目标是检查这些熔岩的成分在多大程度上直接继承自地幔或熔体聚集过程中的混合。岩浆挥发物，如H2O， CO2， S， F和Cl，将在Rise附近两个不同地区的大约200个地球化学特征良好的熔岩中进行分析。这些数据将与地球物理数据相结合，以确定岩浆的演化，以及是否可以确定它们所代表的地幔起源成分的多少。这项工作的更广泛影响包括支持EPSCoR州的机构、国际（日本和法国）和机构间合作以及本科培训。