大洋钻探与地层学──高分辨率磁性生物年代地层格架

OCEAN DRILLING PRIGRAM AND STRATIGRAPHY:HIGH RESOLUTION MAGNETOBIOCHRONOLOGY SCHEME

深海钻探计划（ＤＳＤＰ）和大洋钻探计划（ＯＤＰ）实施以来促进了地层学的发展。通过对大洋沉积物的研究，利用生物属、种的始、末现面事件建立起了晚中生代一新生代高精度的钙质超微化石、有孔虫、放射虫以及沟鞭藻的化石带，综合利用这些基准面事件，可使地层划分精度达１０万年以内。使用液压活塞取心技术，建立起了完整、连续的中、新生代磁性地层剖面，加之放射性年龄的测定，确定了数百个生物属、种始、末现面的绝对年龄值，建立起高分辨率的磁性生物年代格架，使之可以进行全球性的高分辨率地层对比，以及进行有关海洋生物的发生、迁移、演化、绝灭等理论问题的研究。

years of Ocean Drilling have advanced the stratigraphy. The Late Mesozoic toCenozoic zonation schemes of calcareous nannofossil, foraminifera , radiolaria and dinoflag-ellate were established on basis of the information gained from DSDP and ODP,and theresolution of stratigraphic division can be as high as less than 0. 1Ma using numerous ma-rine bio-datum events.New techniques such as hydraulic piston coring was applied to DSDP Leg 73 in theSouth Atlantic Ocean and yielded a tight calibration between biotratigraphy and magneticpolarity time scale. Since then , biostratigraphic datum has been correlated with magne-tostratigraphic chron for each leg of DSDP and ODP and a high resolution magneto-biochronologic schemes of Late Mesozoic and Cenozoic has been established. As a result,some theoretical topics such as origin,migration,evolution and extinction of microorganismcan be explored using data from legs located at various latitudes.