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: 0727576
• 负责人: Gary Acton
• 金额: $ 16.21万
• 依托单位: University of California-Davis
• 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=0727576&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.

智力优点：该研究使用经典，最先进的技术和新技术来研究海洋钻井程序钻井核心氧化铁矿物质的磁性，岩石学和地球化学特征来确定海底磁反应的性质和起源。 它还将确定哪些矿物是地球地磁场的忠实录音机，以及在矿物质中发生什么深处和/或改变的地壳。该研究还研究了矿物组成，晶粒尺寸和改变状态对海底火山岩磁信号的影响。 测得的特性将用于了解海壳的岩浆，构造和改变历史，以及地球地磁场强度和方向的变化。 将分析穿透几乎整个海角的核心，并使用自然和诱导的残余磁性以及磁滞性能确定磁性特性。敏感性；时刻；以及较高，低和室温下的福克分布。铁氧化铁的组成，氧化态和矿物质特征将由反射的光学显微镜，电子显微探针和扫描电子显微镜确定。 将使用Thellier-type方法估算生物质，以及最近发布的修改和两种新的探索方法。更广泛的影响：这项工作的更广泛的影响包括开发新方法进行古磁研究；机构之间的合作，其中之一是EPSCOR国家；并支持来自科学和工程的少数人的PI。 这项工作还支持本科培训，并通过大学开放日拥有公共宣传的一部分。