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Direction and paleointensity of the Earth`s magnetic field during reversals and excursions recorded in basaltic lava flows (0.5 - 15 Myr)

玄武岩熔岩流中记录的地球磁场反转和偏移期间的方向和古强度（0.5 - 15 Myr）

基本信息

批准号：
5102944
负责人：
Professor Dr. Heinrich Soffel
金额：
--
依托单位：
依托单位国家：
德国
项目类别：
Priority Programmes
财政年份：
2000
资助国家：
德国
起止时间：
1999-12-31 至 2009-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/5102944?language=en
关键词：
Direction paleointensity Earth magnetic field

项目摘要

During field trips to the Hawaiian and Canary Islands five sequences of lava flows have been sampled. Within these volcanic sequences several reversals and excursions are recorded. Based on first paleomagnetic and rock magnetic investigations the samples proved to be excellent recorders of the past Earth's magnetic field. We intend to investigate the variations of the direction and absolute paleointensity during these transitional states and extend this research to volcanic sequences in the southern hemisphere (Fernando de Noronha). This ist an especially important subject for paleomagnetic research, since there are only fex recordings of the transitional field in lavas from the southern hemisphere. The presently available records are too few to decide whether a transition is dominated by a dipolar or a nondipolar field configuration. The sampling of additional volcanic sequences will provide an opportunity to determine the paleosecular variation in different hemispheres. Detailed rock magnetic investigation and ore microscopy will ascertain that high quality paleointensity data are obtained. By comparison of our results with published data we will test the hypotheses of an interaction between mantle heterogeneities and the geodynamo as well as investigate possible transitional field configurations of reversals and excursions.

在夏威夷和加那利群岛的实地考察中，对五个熔岩流序列进行了采样。在这些火山序列中，记录了几次反转和漂移。根据第一次古地磁和岩石磁学调查，这些样品被证明是过去地球磁场的优秀记录者。我们打算调查的方向和绝对古强度的变化，在这些过渡状态，并将这项研究扩展到火山序列在南半球（费尔南多-迪诺罗尼亚）。这是古地磁研究的一个特别重要的课题，因为只有来自南半球的熔岩中的过渡磁场的fex记录。目前可用的记录太少，无法确定跃迁是由偶极场还是非偶极场结构主导。额外的火山序列的采样将提供一个机会，以确定在不同的半球的古长期变化。详细的岩石磁性调查和矿石显微镜检查将确保获得高质量的古强度数据。通过比较我们的研究结果与已发表的数据，我们将测试假设的地幔不均匀性和地球发电机之间的相互作用，以及调查可能的反转和偏移的过渡场配置。