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

过去500万年来地磁古场的时空特征主要来源于海洋磁性地层学资料。海洋沉积物中天然剩磁的获得受地球磁场以外的多种因素的强烈影响。该工作旨在通过地层网络分离地磁信息，该网络将从多参数数据集和新采用的数学技术中导出，以定义大量区域约束的海洋古地磁记录的共同高分辨率时间尺度。通过模拟古磁场和非场影响作为古地磁记录的参数滤波器，该方法将在从加那利群岛北部和东部地区（欧盟项目CANIGO）采集的重力岩心子集上进行开发和测试。除了高分辨率的古油田记录外，该项目还应详细了解海洋沉积矿床中的反射磁化采集。

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.