北山地区石炭纪-二叠纪构造背景及演化过程存在很大争议，且缺少可靠的古地磁数据制约。本申请项目拟在北山地区蛇绿岩带所划分的不同微地块上，选择同时具有生物年代和同位素年龄控制的石炭-二叠系地层剖面，通过详细的古地磁取样、系统的室内古地磁剩磁测试和岩石磁学实验研究，获得北山地区石炭-二叠纪可靠的古地磁数据，进而从构造磁学角度，结合周边块体古地磁数据，研究北山地区晚古生代大地构造背景及古地理演化问题，探索古亚洲洋在该区的闭合时限，最终为北山盆地群和银额盆地油气勘探提供理论和技术基础，具有重要理论意义和实际意义。

Previous study on Carboniferous - Permian tectonic background and evolution process in Beishan area have been controversial due to the lack of reliable paleomagnetic data. Therefore, we will pick up representative paleomagnetic samples from the Carboniferous-Permian stratigraphic sections controlled by paleontology and isotope chronology on different blocks divided by ophiolite belts in Beishan area. Then, the reliable Carboniferous and Permian paleomagnetic data will be given after detailed indoor paleomagnetic remanence and rock magnetic experiments. Based on the Carboniferous-Permian paleomagnetic data from different blocks in the Beishan area and other surrounding blocks, the closure time of the paleo-Asian Ocean in Beishan area will be proposed，as well as tectonic setting and Paleogeographic evolution of the Beishan area in late Paleozoic, which would provide scientific basis for oil and gas exploration in Beishan basin group and Yin-E basin.