RUI: Testing Models of Climate-Induced Geomagnetic Field Behavior with a Record of Pleistocene Paleomagnetic Directions

这项研究的主要重点是测试气候模型- 感应地磁场行为，预测相关性 在全球冰量随时间变化之间， 古地磁矢量随时间的变化。 一 先前发表的18 O年更新世变化记录 深海沉积物岩心的变化被用来代表 50万年来的全球冰量。 中的变化 在此时间间隔期间的磁场由 一个沉积层的古地磁方向数据记录 暴露于俄勒冈州中南部的层序。 在比较 两个记录1）进行了详细的抽样程序， 提高现有古地磁记录的准确性; 进行了移动窗口交叉谱分析， 年龄控制。 后一种方法是三种独立的方法之一， 三所学术机构正在实施年龄控制方法， 加强年龄控制。 角色散分析和频带- 通滤波是比较中使用的方法之一 改进的古地磁记录和18 O记录之间的差异。 年龄控制方面的改进是否足以 允许测试上述模型，古地磁记录 将对地磁学的研究做出重大贡献， 地层学和构造学

The main focus of this study is to test models of climate- induced geomagnetic field behavior which predict a correlation between time-dependent variations in the volume of global ice and time-dependent variations in the paleomagnetic vector. A previously-published record of Pleistocene variations in 18O from deep-sea sediment cores is used to represent changes in global ice volume for last 500,000 years. The variations in the magnetic field during this time interval are represented by a record of paleomagnetic directional data from a sedimentary sequence exposed in south-central Oregon. Prior to comparing the two records 1) a detailed sampling program was conducted to improve the accuracy of the existing paleomagnetic record and 2) a moving-window cross-spectral analysis was conducted to improve the age control. The latter method is one of three independent age control methods underway at three academic institutions to improve the age control. Angular dispersion analysis and band- pass filtering are among the methods used in the comparison between the improved paleomagnetic record and the 18O record. Whether or not the improvements in age control are sufficient to allow the testing of the above models, the paleomagnetic record will contribute significantly to research in geomagnetism, stratigraphy, and tectonics.