OCEAN DRILLING PROGRAM AND STRATIGRAPHY:HIGH RESOLUTION MAGNETOBIOCHRONOLOGY SCHEME
Received date: 1994-02-21
Online published: 1995-06-01
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—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。
徐钰麟 . 大洋钻探与地层学——高分辨率磁性生物年代地层格架[J]. 地球科学进展, 1995 , 10(3) : 258 -262 . DOI: 10.11867/j.issn.1001-8166.1995.03.0258
25 years of Ocean Drilling have advanced the stratigraphy. The Late Mesozoic to Cenozoic zonation schemes of calcareous nannofossil,foraminifera , radiolarian and dinoflagellate were established on basis of the information gained from DSDP and ODP,and the resolution of stratigraphic division can be as high as less than 0. 1Ma using numerous marine bio-datum events.
New techniques such as hydraulic piston coring was applied to DSDP Leg 73 in the South Atlantic Ocean and yielded a tight calibration between biotratigraphy and magnetic polarity time scale. Since then, biostratigraphic datum has been correlated with magnetostratigraphic 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 microorganism can be explored using data from legs located at various latitudes.
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