山东省前寒武纪地层形成时代—同位素地质测年的证据

Formation of Precambrian Strata in Shandong Province Isotopic Dating Evidences

摘要:

精确同位素地质测年结果表明，沂水岩群形成时代为2760～2700Ma，泰山岩群雁翎关岩组、柳杭岩组下亚组和孟家屯岩组形成时代为2750～2700Ma，均属新太古代早期；泰山岩群柳杭岩组上亚组、山草峪岩组形成时代为2600～2540Ma（被峄山岩套石英闪长岩和傲徕山岩套二长花岗岩侵入），济宁岩群岩浆锆石年龄（2561±24）Ma，均属新太古代晚期。荆山群和粉子山群的形成时代为古元古代晚期。芝罘群碎屑锆石UPb年龄（1658±32）Ma、（1792±43）Ma，形成时代为中元古代。云台岩群花果山组碎屑锆石UPb年龄800～740Ma，形成时代为新元古代。

Abstract:

As showed by precise isotopic dating results, Yishui group was formed in the 2760~2700Ma, while Yanlingguan formation in Taishan group, Xiayazu formation and Mengjiatun formation in Liuhang group were formed in 2750~2700Ma. They all belong to early period of Neoarchean. Shangya formation and Shancaoyu formation of Liuhang formation in Taishan group were formed in 2600~2540Ma (intruded by quartz diorite rock units in Yishan rock group and monzogranite in Aolaishan rock group), while zircons ages of Jining group was (2561±24)Ma. They all belong to the late Archean. The formation period of Jingshan group and Fenzishan group is late Paleoproterozoic. Detrital zircon U-Pb age of Zhifu group was(1658±32) Ma and (1792±43)Ma. They were formed in the Mesoproterozoic. Detrital zircon U-Pb age of Huaguoshan group is 800~740Ma, and was formed in the Neoproterozoic.