北京山前冲洪积缓倾斜平原晚新生代沉积物磁性地层学研究

通过北京地区新8钻孔的古地磁样品测试研究,发现其岩心所包含的正负极性段,可与标准极性柱中的布容正极性时.高斯正极性时和松山反极性时具有较好的对比性。建立高精度、可靠的长尺度年代地层格架,为建立北京城市三维地质结构提供了基础,对研究新构遭活动.平原区地质演化历史,工程地质和水文地质条件,具有重要的意义。

A Magnetostratigraphic Study of Upper Cenozoic Sediments in Beijing's Gently-sloping Alluvial Piedmont Plain

Through a systemic magnetostratigraphic sampling,testing,analysis and study of the Xin-8 drill hole in the Beijing area,it has been found that the positive polarity and negative polarity intervals reflected in the drill cores can be well correlated with the Brunhes normal polarity,Gauss normal polarity and Matsuyama reversed polarity chrons in the standard polarity column,respectively.The establishment of a high-accuracy and reliable long time-scale chronostratigraphic framework has laid a good foundation for building the 3-D geological struc- ture of the city,and is of great importance in studies of the new tectonic activities,geological evolution history of the plain area,as well as the geotechnical and hydrogeological conditions.