Collaborative Research: Magnetic Ocean Crust: High-Fidelity Geomagnetic Field Recorder and Sensitive Indicator of Magmatic, Tectonic, and Alteration Processes

合作研究：磁性洋壳：高保真地磁场记录仪和岩浆、构造和蚀变过程的敏感指示器

• 批准号: 0727764
• 负责人: Emilio Herrero-Bervera
• 金额: $ 15.7万
• 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: 2007
• 资助国家: 美国
• 起止时间: 2007-09-01 至 2011-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0727764&HistoricalAwards=false
• 关键词: Collaborative; Research; Magnetic; Ocean; Crust

Intellectual Merit: This research uses classical, state-of-the-art, and new techniques to investigate the magnetic, petrologic, and geochemical characteristics of iron oxide minerals from Ocean Drilling Program drill cores to determine the nature and genesis of seafloor magnetic anomalies. It will also determine which minerals are faithful recorders of Earth's geomagnetic field and at what depths in the crust they minerals occur and/or alter. The research also examines the impact of mineral composition, grain size, and alteration state on the magnetic signal of seafloor volcanic rocks. The measured properties will be used to understand the magmatic, tectonic, and alteration history of the ocean crust, as well as changes in Earth's geomagnetic field strength and direction. Cores that penetrate nearly an entire section of ocean crust will be analyzed and magnetic properties will be determined using natural and induced remnence magnetizations, as well as hysteresis properties; susceptibilities; moments; and FORC distributions at high, low, and room temperatures. Composition, oxidation state, and mineral characteristics of the iron oxides will be determined from reflected light microscopy, electron microprobe, and scanning electron microscopy. Paleointensities will be estimated using Thellier-type methods, along with recently published modifications and two new exploratory methods. Broader Impacts: Broader impacts of the work include development of new methods for paleomagnetic studies; collaboration between institutions, one of which is in an EPSCoR state; and support of a PI from a minority under-represented in science and engineering. The work also supports undergraduate training and has a component of public outreach through a university Open House.

智力优势：本研究使用经典的、最先进的和新的技术来研究海洋钻探计划钻探岩心中氧化铁矿物的磁性、岩石学和地球化学特征，以确定海底磁异常的性质和成因。它还将确定哪些矿物是地球地磁场的忠实记录者，以及它们在地壳的什么深度出现和/或改变。研究了矿物组成、粒度、蚀变状态对海底火山岩磁信号的影响。测量的性质将用于了解海洋地壳的岩浆、构造和蚀变历史，以及地球地磁场强度和方向的变化。将对穿透几乎整个海洋地壳的岩心进行分析，并利用自然磁化和感应磁化以及磁滞特性确定其磁性；脆弱的感情;时刻;以及在高温、低温和室温下的FORC分布。氧化铁的组成、氧化态和矿物特征将由反射光显微镜、电子探针和扫描电子显微镜测定。古强度将使用thellier类型的方法，以及最近发表的修改和两种新的探索方法来估计。更广泛的影响：这项工作的更广泛的影响包括发展古地磁研究的新方法；机构之间的合作，其中一个处于EPSCoR状态；以及来自科学和工程领域少数族裔的PI的支持。这项工作还支持本科生培训，并通过大学开放日进行公共宣传。