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

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。根据最初的古地磁和岩石地磁调查，这些样品被证明是过去地球磁场的优秀记录者。我们打算研究这些过渡时期的方向和绝对古强度的变化，并将这一研究扩展到南半球的火山序列（Fernando de Noronha）。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的过渡性磁场记录。目前可用的记录太少，无法确定跃迁是由偶极还是非偶极场结构主导。对其他火山序列的采样将为确定不同半球的古世俗变化提供机会。详细的岩石磁学调查和矿石显微检查将确定获得高质量的古强度数据。通过将我们的结果与已发表的数据进行比较，我们将检验地幔非均质性与地球动力学之间相互作用的假设，并研究反转和偏移可能的过渡性场结构。

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.