Investigations of the Variations of the Cenozoic Magnetic Field in the Pacific

太平洋新生代磁场变化的研究

• 批准号: 8619982
• 负责人: Charles Helsley
• 金额: $ 8.5万
• 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: 1987
• 资助国家: 美国
• 起止时间: 1987-04-15 至 1989-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8619982&HistoricalAwards=false
• 关键词: Investigations; Variations; Cenozoic; Magnetic; Field

Analyses of paleomagnetic data generally assume that the earth's magnetic field, when averaged over several thousand years, conforms to that of a geocentric axial dipole. Nevertheless, long-term non-dipolar components have been found to be important. In fact, recent analyses suggest that during the Cenozoic, multipolar field components have varied so as to produce alternating "far-sided" and "near-sided" effects of significant magnitude. Understanding the nature and magnitude of these deviations from an axial dipole are important in plate tectonic reconstructions using paleomagnetic data, since such reconstructions generally assume that the deviations are small when compared to other uncertainties in the paleomagnetic data. The objective of the present recommended award is to assemble and compile the paleomagnetic data from a large number of piston core sites from the Pacific Ocean. These data were generated during a number of separate projects during the last fifteen years and form an ideal data set for examining both spatial and temporal aspects of the non-dipole field. Initial activity on this project will be to determine sediment ages using a consistent stratigraphy for the cores. Additionally, individual data points will be examined for both their consistency and potential source of error. Once this task is completed, the nondipole field will be examined in several areas of the Pacific Ocean basin. The principal investigator on this project is highly qualified to undertake the proposed study. Funding is highly recommended at $85,000 in FY87 for 18 months.

对古磁数据的分析通常假定地球的磁场平均几千年的时间符合地理为中心的轴向偶极子的磁场。 然而，已经发现长期非二极性成分很重要。实际上，最近的分析表明，在新生代期间，多极场成分有所不同，以产生显着幅度的交替的“远面”和“近边”效应。使用古磁数据了解这些与轴向偶极子的偏离的性质和大小在板块构造重建中很重要，因为这种重建通常认为与古磁数据中的其他不确定性相比，偏差很小。 本建议奖励的目的是从太平洋的大量活塞核心部位组装和编译和编译古磁数据。这些数据是在过去15年中在许多单独的项目中生成的，并形成了检查非偶极场的空间和时间方面的理想数据集。该项目的初始活动将是使用核心一致的地层来确定沉积物年龄。 此外，将检查单个数据点的一致性和潜在的错误源。 一旦完成此任务，将在太平洋盆地的几个地区进行北极柱场。 该项目的主要研究人员有资格进行拟议的研究。强烈建议将资金在187财年的85,000美元中为85,000美元。