江汉盆地下第三系火山岩年代

徐论勋; 阎春德; 俞惠隆; 王宝清; 余芳权; 王典敷

doi:10.11743/ogg19950206

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江汉盆地下第三系火山岩年代
CHRONOLOGY OF PALEOGENE VOLCANIC ROCKS IN JIANGHAN BASIN
1995年16卷第2期页码：132-137
网络首发：1995-06-25，

纸质出版：1995
DOI： 10.11743/ogg19950206
稿件说明：

移动端阅览

徐论勋, 阎春德, 俞惠隆, 等. 江汉盆地下第三系火山岩年代[J]. 石油与天然气地质, 1995,16(2):132-137. DOI： 10.11743/ogg19950206.

Xu Lunxun, Yan Chunde, Yu Huilong, et al. CHRONOLOGY OF PALEOGENE VOLCANIC ROCKS IN JIANGHAN BASIN[J]. 1995, 16(2): 132-137. DOI： 10.11743/ogg19950206.

摘要

对江汉盆地下第三系23个重武岩样品K-Ar同位素年龄测定

并按不同层位进行等时线处理

表明各组样品的年龄分别为潜江组四段41.0Ma、荆沙组45.5Ma、新沟嘴组51.2Ma、沙市组62.4Ma

与所处的地层时代基本一致。据此

编制了与火山活动事件紧密相关的江汉盆地早第三纪地层地质年代表。

Abstract

The K-Ar isotopic ages of 23 Paleogene basalt specimens collected from Jianghan Basin were determined and isochrones were made according to different horizons.Isochron dating results are given as follows:the 4th member of Qianjiang Formation(E

)is 41.0 Ma;Jingsha Formation(Ej)

45.5 Ma;Xingouzui Formation (Eχ)

51.2 Ma;Shashi Formation (Es)

62.4 Ma.The results are generally coincident with their stratigraphic times. Based on the results

the Paleogene geochronologic scale of the basin that is closely related to volanic activites has been made.