华北陆台早前寒武纪地质年代讨论

Early Precambrian Geological Chronology of North China Platform

根据区内４００多个测年数据，结合地质产状，参照国际前寒武纪分会推荐的年表，将区内早前寒武纪划分为古太古代（３６００～３２００Ｍａ），如曹庄群，中太古代早期（３２００～３０００Ｍａ），如迁西群下亚群，晚期（３０００～２８００Ｍａ），如迁西群上亚群，新太古代早期（２８００～２６５０Ｍａ），如遵化群，晚期（２６５０～２４５０Ｍａ），如双山子群，朱杖子群；区内古元古代可划分为成铁纪（２４５０～２３５０Ｍａ），如三合明群，层侵纪（２３５０～２０５０Ｍａ），其２３５０～２２００Ｍａ为剥蚀期，２２００～２０５０Ｍａ为沉积期，如豆村群；造山纪（２０５０～１８５０Ｍａ），如东冶群，稳化纪（１８５０～１７００Ｍａ），如郭家寨群。

On the basis of more than 400 geological dating data and in combination with thegeologiical occurrences and the ISPS geological time table, the Early Precambrian of the areais divided into Paleoatchaean (3600￣3200 Ma), such as Chaozhuang Group; Early Mesoarchaean (3200￣3000 Ma), such as lower subgroup of Qianxi Group;Late Mesoarchean (3000￣2800 Ma), such as upper subgroup of Qianxi Group; Early Neoarchean (2800￣2650Ma), such as Zhunhua Group; Late Neoarchaean (2650￣2450 Ma), such as ShuangshanziGroup and Zhuzhangzi Group. The Paleoproterozoic of the area can be divided into: Siderian(2450￣2350 Ma), such as Sanhetning Group;Rhyacian (2350￣2050 Ma), which consistsof two stages, one from 2350 to 2200 Ma is of deintegration stage, the other from 2200 Mato 2050 Ma is of sedimentation stage, such as Doucun subgroup;Orosirian (2050￣1850Ma), such as Dongye subgroup; the Mesoproterozoic is of Statherian (2850￣1700 Ma), suchas Guojiazai subgroup.The author also discusses the basis for the division, the 10 principalgeothermal events,and the stratigraphic correlations in the area.