关于胶莱盆地东南缘基性火山熔岩喷发时代上限的讨论

THE IMPROTANT Rb-Sr ISOCHRON DATA FOR THE OLIVINEBASALT---DISCUSS ON THE UPPER LIMIT OF ERUPTIVETIME OF THE BASIC VOLCANIC ROCKS FROM THE EAST, WEST EDAGE OF JIAOLAI BASIN

首次对采自青岛即墨WN部两个深钻孔中新鲜玄武岩样品进行Rb-Sr同位素测年,测定年龄值为65.77±13.6Ma。认为该年龄值代表了胶莱盆地东南缘基性火山熔岩喷发的时代上限,对于整个胶莱盆地中基性火山岩的划分和对比具重要的年代学意义。

In this paper, Rb-Sr isochron data for the olivine basalt from the northwest Jimo, Qingdao first obtained ITS Rb-Sr isochron age is 65.77±13. 6 Ma. This age represents the upper limitof eruptive time of basic volcanic rocks in the eastwest edge of Jiaolai basin, and has great significance for dividing and comparing the basic volcanic rocks in whole Jiaolai basin.