关键词: 辽河断陷, 早第三纪, 火山岩, 钾氩纪年, 地层年代单位, 地质时代确定, 地层划分

Abstract: The main subject of this paper is to revise the geological time according to the results of vocanic rock age determination.The authors used Kr method as a major measure and isochronal line treatment,fast neutron activation method and geological test as complimentary means to ensure the reliability of the results of determination.Tertiary vocanic rock eruptive time profile has been established for the first time,based on the determinations of 63 samples.After a composite induction,the ages of 9 of the ten boundaries in the Palaeogene have been revised.and a tertiary time profile is established.The authors propose,for the first time,that the boundary between Palaeocene and Eocene is at the interface between lower and upper members of Fangshen pao Formation,the boundary between Eocene and Oligocene is located at the interface between upper submember of the 2nd member of Shahe jie Fomation and 3rd member of Shahejie Fomation.In addition,the authors take the fossil assemblages as a dominant faor and the results of their examination as the complimentary one in a correlation of the palaeomagnetic data from this depression,Chaidamu Basin and Jiyang depression.The three far-separated depressions,located at different tectonic units,have the similar reults,using different methods.This shows that the studv is successful.