关于辽西北票地区兴隆沟组火山岩时代的再认识

The age of volcanic rocks of the Xinglonggou Formation in Beipiao,western Liaoning,China:Revisited

针对近年来关于兴隆沟组火山岩同位素年龄及地层归属方面存在的分歧,通过详细的地质填图已查清,近年报道的2组U-Pb同位素年龄均为贯穿兴隆沟组火山-沉积地层的霏细斑岩脉年龄,兴隆沟组地层仍应归属为下侏罗统。

In recent years there have existed divergent views about the isotopic ages of volcanic rocks of the Xinglonggou Formation and assignment of the strata. Through detailed geological mapping, the authors have ascertained that the two groups of U-Pb ages reported in recent years are both those of felsophyre dikes that penetrate the volcanic-sedimentary strata of the Xinglonggou Formation in this area and that the Xinglonggou Formation should be still assigned to the Lower Jurassic.