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古近系与新近系的界线在浮游生物地层分带中的具体位置长期存在争议,笔者依据珠江口盆地西部50余口钻井微体古生物资料中的浮游有孔虫和钙质超微化石记录,辅以沟鞭藻和主要孢粉事件对研究区古近系与新近系的生物地层界线展开研究,探讨了浮游有孔虫Globigerina ciperoensis,Globoquadrina dehiscens,Globigeri-noidestrilobus以及钙质超微浮游生物Sphenolithus ciperoensis,Zygrhablithus bijugatus和Reticulofenestra bisec-ta等标志性化石的地层意义,并重新厘定了珠江口盆地西部古近系与新近系的生物地层界线标准。
According to the records of planktonic foraminiferous calcareous and calcareous microfossils in more than 50 drilling microfacies paleontological data in the western part of the Pearl River Mouth Basin, the author has long been in dispute about the exact location of the boundary between Paleogene and Neogene strata in zonoplankton stratigraphy. Supplemented by dinoflagellates and major sporo-pollen events, studied the biological stratigraphic boundaries of Paleogene and Neogene in the study area, and discussed the phytoplankton population of Globigerina ciperoensis, Globoquadrina dehiscens, Globigeri-noidestrilobus and calcareous phytoplankton Sphenolithus ciperoensis , Zygrhablithus bijugatus and Reticulofenestra bisec-ta and other landmark fossils of the stratigraphic significance, and to re-determine the Pearl River Mouth Basin in western Paleogene and Neogene stratigraphic boundary line standards.