Collaborative Research: Using Melt Inclusions to Test Models for Wet Melting and Melt Extraction Beneath Mid-Ocean Ridges

合作研究：利用熔体包裹体测试大洋中脊下湿法熔融和熔体提取模型

• 批准号: 0926422
• 负责人: Samuel Soule
• 金额: $ 30.9万
• 依托单位: Woods Hole Oceanographic Institution
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-09-01 至 2013-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0926422&HistoricalAwards=false
• 关键词: Collaborative; Research; Using; Melt; Inclusions

This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5).Mid-ocean ridges are the primary location of new crust generation. Because crustal creation impacts the structure of the crust and mantle in the region of generation, being able to read the geochemical clues of deep seated magmatic processes in surface-erupted lavas is critical to our knowledge of how the Earth works. This research uses state-of-the-art ion probe analyses of olivine hosted melt inclusions to examine magmatic processes that result in the chemistry of lavas erupted at mid-ocean ridges. It focuses on determining the concentrations of volatile phases, such as H2O and CO2, that are known to control mantle melting and impact eruption processes. Samples from the Southwest Indian Ridge and other slow and ultraslow spreading centers will be analyzed. The data which come from environments characterized by cooler thermal regimes; lower average degrees of melting; and extremely focused volcanism, will be compared with data from faster spreading ridges. Project outcomes include: (1) characterizing the relationship between H2O and degree of melting over a range of depths beneath mid-ocean ridge axes, (2) determining changes in melt chemistry along the ridges, and (3) quantifying volatile fluxes from ultra-slow mid-ocean ridge spreading environments. In addition the work helps us to better evaluate the extent to which olivine hosted melt inclusions record melting processes in other geologic settings. Broader impacts of the work include support for an early career scientist whose gender is under-represented in the sciences and undergraduate training. Results will also be made publicly available on the NSF-funded PetDB database.

该奖项根据 2009 年美国复苏和再投资法案（公法 111-5）提供资金。洋中脊是新地壳生成的主要地点。 由于地壳生成会影响生成区域的地壳和地幔结构，因此能够读取地表喷发熔岩中深层岩浆过程的地球化学线索对于我们了解地球如何运作至关重要。 这项研究使用最先进的离子探针分析橄榄石熔融包裹体来检查导致大洋中脊喷发熔岩化学成分的岩浆过程。它的重点是确定挥发相的浓度，例如水和二氧化碳，这些挥发相已知可以控制地幔熔化和撞击喷发过程。 来自西南印度洋脊和其他慢速和超慢速扩散中心的样本将被分析。 数据来自以较冷的热状态为特征的环境；平均熔化度较低；以及极其集中的火山活动，将与来自更快扩张的山脊的数据进行比较。 项目成果包括：(1) 表征大洋中脊轴以下一定深度范围内 H2O 与融化程度之间的关系，(2) 确定沿洋脊的熔融化学变化，以及 (3) 量化来自超洋洋脊轴的挥发性通量。缓慢的洋中脊扩张环境。 此外，这项工作有助于我们更好地评估橄榄石中的熔融包裹体在其他地质环境中记录熔融过程的程度。 这项工作的更广泛影响包括支持早期职业科学家，其性别在科学和本科培训中代表性不足。 结果还将在 NSF 资助的 PetDB 数据库中公开发布。