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对来自二郎坪岩群的白云母、角闪石用阶段升温法进行了~(40)Ar/~(39)Ar年龄谱研究，结合二郎坪岩群地质特征，认为白云母近似直线年龄港的评年龄（111．2Ma）及角闪石稳定评年龄（121．5Ma）代表了二郎坪岩群最后一次热事件的时代；角闪石与白云母封闭温度的不同以及角门石的成分与结构环带导致二者坪年龄的差异，二郎坪岩群在121．5～111．2Ma曾发生区域变质作用，整个秦岭造山带在此期间仍处于构造活动期。
The ~ (40) Ar / ~ (39) Ar age spectra of muscovite and hornblende from amphibole group were studied by phase-temperature method. According to the geological characteristics of Erlangping group, The age of evaluation (111.2Ma) and stable age of amphibole (121.5Ma) represent the era of the last thermal event of Erlangping Group; the difference between the closing temperature of amphibole and muscovite and the composition and structure of the gablestone The results show that the Erlangping group had a regional metamorphism between 121.5 and 111.2 Ma, and the entire Qinling orogenic belt is still in tectonic activity during this period.