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笔者通过对我国东部盆地晚白垩世和早第三纪沉积及古生物资料,特别是有孔虫、沟鞭藻、钙质超微化石、龙介虫科栖管、藻叠层石等的综合研究认为,我国东部盆地在晚白垩世至早第三纪曾发生过四期海侵。由老到新依序为森诺曼期、晚土伦期至早赛诺期、古新世至早始新世,晚始新世至早渐新世。在海侵影响下,我国东部十多个盆地形成了海陆过渡相半咸水沉积,并具有典型的半咸水生物化石组合。通过对松辽盆地、苏北一南黄海盆地、渤海湾沉降区和江汉盆地的水平面升降变化分析发现其海侵期基本上与全球海平面升降变化相吻合。此外,本文还讨论了以上几个地区的古地理。海侵的研究对于中国东部中、新生代沉积盆地内的层序地层学研究和油气勘深具有指导性意义。
Based on the comprehensive study of Late Cretaceous and Early Tertiary sedimentary and paleontological data in the eastern basin, especially the foraminifera, dinoflagellates, calcareous microfossils, It is believed that there have been four transgressions during the Late Cretaceous to early Tertiary in the eastern basin of China. From the old to the new order of Sennommand, Late Turennian to early Sinuo, the Paleocene to Early Eocene, Late Eocene to Early Oligocene. Under the influence of transgression, more than a dozen basins in the eastern part of China have formed the brackish water sediments of the transitional phase of the sea and the land, and have the typical combination of brackish water biological fossils. Based on the analysis of the water level changes in the Songliao Basin, the Northern Yellow Sea Basin, the Bohai Bay subsidence area and the Jianghan Basin, the transgression period basically coincides with the global sea level change. In addition, this article also discusses the paleogeography of the above areas. The study of transgression is of instructive significance for the study of sequence stratigraphy and hydrocarbon exploration in the Mesozoic and Cenozoic sedimentary basins in eastern China.