Isolation of paleofield information from the natural remanent magnetization of marine sediments using stratigraphic networks

过去五百万年的地磁古地磁场在空间和时间上的特征很大程度上是从海洋磁性地层数据中得出的。海洋沉积物中天然剩磁的获取受到除地磁场以外的多种因素的强烈影响。这项工作旨在通过从多参数数据集派生的地层网络和新采用的数学技术来分离地磁信息，以便为大量区域约束的海洋古地磁记录定义一个共同的高分辨率时间尺度。通过将古场和非场影响一起模拟为古地磁记录的参数过滤器，地层网络应该允许同时识别滤波参数和古场信号。该方法将在加那利群岛以北和以东地区(欧盟CANIGO项目)采集的重心子集上进行开发和测试。除了高分辨率的古磁场记录外，该项目还应该对海洋沉积沉积物中的剩余磁化采集有详细的了解。

Characteristics of the geomagnetic paleofield over the last 5 myrs in space and time were largely derived from marine magnetostratigraphic data. The acquisition of natural remanent magnetization in marine sediments is strongly influenced by a variety of factors other than the Earth`s field. The proposed work aims at isolating the geomagnetic information by means of stratigraphic networks which will be derived from multipara- meter data sets and newly adopted mathematical techniques to define a common high resolution timescale for a large number of regionally constraint marine paleomagnetic records.By modeling paleofield and non-field influences together as parametric filters of the paleomagnetic records, the strati- graphic network should allow to identify at the same time the filter parameters and the paleofield signal.The methods will be developed and tested on a subset of gravity cores recovered from an area north and east of the Canary Islands (EU project CANIGO). In addition to a high resolution paleofield record, the project should yield detailed insight into the remanent magnetization acquisition in marine sedimentary deposits.