论文部分内容阅读
绪言生物地层单位及基准面的数值年龄可以由放射性测量或古地磁地层学方法来测定。精确和可靠的古地磁地层学研究必须具备下列条件:(1)适合作古地磁地层学测量的原状岩芯(2)取得连续的岩芯剖面,以便完整地记录磁极性反转;(3)中等到快速的深海沉积速率,
INTRODUCTION The numerical age of biostratigraphic units and datums can be determined by radiometric or paleomagnetic stratigraphy. Precise and reliable palaeostratigraphic studies must meet the following criteria: (1) Prototype cores suitable for paleomagnetic stratigraphy surveys (2) Continuous core profiles are obtained to completely record magnetic polarity reversals; (3) Medium Wait until the rapid rate of deep-sea sedimentation,