全球范围内,新生代碱性玄武岩中常含有数量和大小不等的超镁铁质岩石包体(以下简称包体)。因其可供测定年龄的同位素含量甚少,因而迄今缺乏探讨其成因的年龄依据。本文对我国辽宁省宽甸地区第三纪碱性玄武岩中有代表性的两个包体的年龄进行方法研究和测定,获得了值得重视的结果。 Globally, the Cenozoic alkaline basalts often contain ultramafic rock inclusions (hereinafter referred to as inclusions) of varying sizes and sizes. Due to the small amount of isotopes available for determination of age, the age-old basis for exploring its causes has so far been lacking. In this paper, the age of two typical enclaves in Tertiary alkaline basalt in Kuandian area, Liaoning Province, is studied and measured, and the results worthy of attention are obtained.