| 摘要: |
| 本文针对长期争议的早第三纪时期济阳坳陷及其邻近地区是否存在海侵问题,根据沉积特征及古生物资料,以济阳坳陷为例,重点研究了下第三系沙河街组二段至一段的演化特征,提出了新的观点——海啸。指出了遍布于整个渤海湾盆地的沙二段上部冲积相是由强海啸形成,它也是造成沙一段时期发生第三纪以来最大湖淹的主要原因。认为海啸的成因很可能与星体对地球的碰撞有关,属于地质时期的偶然事件。 |
| 关键词: 早第三纪 济阳坳陷 生物绝灭 无化石段 被盖式沉积 海啸 星球碰撞 |
| DOI： |
| 附件 |
|
| 基金项目: |
|
| EARLY TERTIARY TRANSGRESSIONS IN THE JIYANG DEPRESSION AND ITS ADJACENT AREAS |
| Zhang Yubin |
| (Research Institute of Geological Sciences, Shengli Petroleum Administration Bureau) |
| Abstract: |
| Whether or not there occurred transgressions in the Jiyang depression,Shandong and its adjacent areas during the Early Tertiary has long been an open question.Exemplified by the Jiyang depression,the emphasis in this paper is placed on the evolution of the first and second members of the Lower Tertiary Shahejie Formation in the depression on the basis of sedimentary and palaeontological information.A new concept tsunami is put forward to explain the formation of the alluvial facies in the upper part of the second member of the Shahejie Formation throughout the Bohai Bay Basin and the reason for maximum lake flooding in the first member of the Shahejie Formation from the Tertiary onwards.It is in-ferred that the origin of tsunami interpreted as the accidental events may well allow to be related to the collision of celestial bodies with the earth. |
| Key words: Early Tertiary Jiyang depression biologic extinction unfossiliferous interval drape sediments tsunami collision of celestial body |
