EOR: Reactive Melt Migration in the Lower Oceanic Crust in IODP Hole U1309D at the Atlantis Core Complex, 30°N, Mid-Atlantic Ridge

EOR：大西洋中脊北纬 30° 亚特兰蒂斯核心复合体 IODP 孔 U1309D 下洋地壳的反应性熔融迁移

• 批准号: 0627991
• 负责人: Eric Hellebrand
• 金额: $ 39.53万
• 依托单位: University of Hawaii
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-11-01 至 2011-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0627991&HistoricalAwards=false
• 关键词: EOR; Reactive; Melt; Migration; Lower

This investigators of this project, supported by the Ocean Drilling Program, plan to investigate the extent by which reactive flow caused by magma infiltration and melt migration alters the geochemical and petrologic characteristics of the lower crust underneath the Mid Atlantic Ridge. This geochemical study will focus on samples from the Atlantis Oceanic Core Complex on the Mid-Atlantic Ridge that were recovered in IODP expeditions 304 and 305, and where seismic refraction data indicate mantle velocities of 8 km/s at shallow depth. This project is an international collaboration involving researchers from Germany and France. The intellectual merit of the project proposed is to better constrain an important crust formation process by obtaining precise major, trace element and isotopic analyses of very fresh samples of this oceanic crust. The research plan include an integrated geochemical approach that will deliver detailed characterization of minerals recovered from core sections that are dominated by noritic gabbros at shallower levels, olivine-gabbros at mid levels and olivine-rich troctolites at deeper levels of the crust. The results will shed light into the geochemical and petrologic modifications that occur in the oceanic crust during magma infiltration and melt migration. The various collaborators will work at integrating their results to better understand lower crustal melt emplacement, infiltration, and interaction in this 200+ meter intrusive interval. In terms of broader impacts, the project will contribute to enhancing infrastructure for research and education at the University of Hawaii and the United States by introducing a state-of-the-art ICP-MS analytical technique developed at Max Planck Institute in Germany by the post-doctoral trainee on this proposal, Dr. Matthias Willbold. This study will also promote an international partnership between the University of Hawaii and international laboratories. Results will be disseminated in the scientific literature and will also be accessible through the IODP system of outreach programs and general education websites. Finally, the project will support the early-career development of two new NSF-supported investigators.

该项目的调查人员在大洋钻探计划的支持下，计划调查由岩浆渗透和熔体迁移引起的反应流改变大西洋中脊下地壳的地球化学和岩石学特征的程度。这项地球化学研究将侧重于在IODP第304和305次考察中发现的大西洋中脊亚特兰蒂斯海洋核心复合体的样本，地震折射数据表明，浅层地幔速度为8公里/秒。该项目是一项国际合作，涉及来自德国和法国的研究人员。拟议项目的智力价值是，通过对这一洋壳的非常新鲜的样品进行精确的主要元素、微量元素和同位素分析，更好地限制一个重要的地壳形成过程。 该研究计划包括一个综合的地球化学方法，将提供从核心部分回收的矿物的详细特征，这些核心部分主要是浅层次的钠长质辉长岩，中层的橄榄石辉长岩和地壳深层的富含橄榄石的troctolites。 研究结果将有助于揭示大洋地壳在岩浆渗透和熔体迁移过程中发生的地球化学和岩石学变化。 不同的合作者将致力于整合他们的结果，以更好地了解下地壳熔体侵位，渗透和在这个200米以上的侵入间隔的相互作用。就更广泛的影响而言，该项目将有助于加强夏威夷大学和美国的研究和教育基础设施，方法是引进德国马克斯·普朗克研究所开发的最先进的ICP-MS分析技术，该技术是由该项目的博士后实习生Matthias Willbold博士开发的。 这项研究还将促进夏威夷大学与国际实验室之间的国际伙伴关系。 研究结果将在科学文献中传播，也可通过海洋学发展方案的外联方案系统和普通教育网站查阅。最后，该项目将支持两个新的NSF支持的调查人员的早期职业发展。