Collaborative Research: Geomagnetic Field for the Last 5 Ma

合作研究：过去5 Ma的地磁场

• 批准号: 9805424
• 负责人: Laurie Brown
• 金额: $ 15.04万
• 依托单位: University of Massachusetts Amherst
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-09-15 至 2003-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9805424&HistoricalAwards=false
• 关键词: Collaborative; Research; Geomagnetic; Field; Last

9805424BrownThis proposal is for a collaborative multi-institutional project to improve the quality and spatial and temporal distribution of the 0-5~Ma paleomagnetic record from lava flows. The ultimate goal of the project is to improve our understanding of how the geodynamo controls the observed magnetic field. Specifically: 1) Do the mid-high latitude flux lobes and north polar low seen in the historical and 0-3 kyr (only northern hemisphere lobes resolved) records persist over paleomagnetic time scales, and 2) Are there are hemispheric differences in the time-averaged field and paleosecular variation? In order to address these issues, the P.I.s have planned systematic paleomagnetic sampling of flows covering as wide an age range as possible at each location, followed by detailed high quality laboratory analyses. Wherever possible paleointensity as well as directional records will be acquired. Fourteen globally distributed sites have been selected for sampling: the plan is designed to complement existing data of high quality, and avoid duplication of known resampling being carried out by other international groups. The specific places chosen include two very high latitude locations, a north-south transect through the Americas, and a site from south-eastern Australia.

9805424 Brownthis提案是针对一个合作的多机构项目，旨在改善熔岩流的0-5〜Ma古磁记录的质量，空间和时间分布。 该项目的最终目的是提高我们对地球魔法如何控制观察到的磁场的理解。 具体来说：1）在历史悠久的纬度裂片和北极低的地方是否在历史上看到的，而0-3 Kyr（仅北半球裂片已解决）记录在古磁性时间尺度上持续存在，而2）在时间平衡的领域和古生物变异上存在半球差异吗？ 为了解决这些问题，P.I.S计划了在每个位置覆盖年龄范围尽可能宽的流量的系统古磁采样，然后进行详细的高质量实验室分析。 在可能的何处，将获取可能的古显微和方向记录。 已选择了14个全球分布式站点进行抽样：该计划旨在补充现有的高质量数据，并避免重复其他国际团体进行的已知重新采样。 所选择的特定位置包括两个非常高的纬度位置，一个通过美洲的南北横梁以及来自澳大利亚东南部的一个地点。