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本文用单颗粒锆石U-Pb定年方法对山西吕梁群的火山岩和宽坪村的花岗质混合片麻岩进行了年代学研究。吕梁群上部的双峰式火山岩喷发于大约2100Ma前,表明吕梁群形成于早元古代。而其主变质作用发生在早元古代晚期,即1806Ma左右。
In this paper, a single-grain zircon U-Pb dating method was used to chronologically study the volcanic rocks of Luliang Group and the granitic gneiss in Kuanping Village. The bimodal volcanic rocks in the upper part of Lvliang Group erupted about 2100 Ma ago, indicating that Luliang Group formed in the Early Proterozoic. The main metamorphism occurred in the late Early Proterozoic, that is about 1806Ma.