针对吉林南部古老岩石测年数据偏新和太古宙与元古宙之间分界时限的混乱,本文运用Sm-Nd等时线法和锆石U-Pb法将吉林南部变质岩系划分为4个年龄段:前阜平旋回(>2600Ma);阜平旋回第一幕(2600～2500Ma);阜平旋回第二幕(2500～2400Ma);阜平旋回第三幕(2400～2350Ma)。阜平旋回第三幕归入太古宙并作为太古宙—元古宙之间分界时限,吉林南部古陆构造环境由活动趋向于稳定,新、老板块沟、弧、盆系统交替,地壳隆起、剥蚀引起K-Ar年龄偏新。该过渡性构造环境和原2500～2350Ma间地质事件归入太古宙将有助于加深对该区地壳演化、板石沟绿岩带铁矿及夹皮沟剪切带金矿化形成的认识。 In view of the disorder of the dating data of the ancient rocks in southern Jilin and the demarcation period between Archean and Proterozoic, Sm-Nd isochron method and zircon U-Pb method are used to divide the southern Jilin metamorphic rocks into four Age: the former Fuping cycle (> 2600Ma); the first episode of the Fuping cycle (2600 ~ 2500Ma); the second stage of the Fuping cycle (2500 ~ 2400Ma); the third cycle of the Fuping cycle (2400 ~ 2350Ma). The third episode of the Fuping cycle belongs to the Archean and serves as the boundary between Archean and Proterozoic. The tectonic environment of the ancient land in southern Jilin tends to be stable from activity to activity. The alternation of ditches, arcs and basin systems between the new and older members, the crustal uplift, Denudation caused K-Ar age partial new. The transition tectonic environment and the original 2500 ~ 2350 Ma geological events into the Archean will help to deepen the understanding of the crustal evolution in this area, the formation of the iron ore in the Ishigou greenstone and the gold mineralization in the Jiapigou shear zone.