鲁西泰山岩群地层划分及形成时代——锆石SHRIMPUPb测年的证据

Stratigraphic Division and Formation Era of Taishan Group in Luxi Area ——Evidence of Zircon SHRIMP U-Pb Dating

摘要:

精确同位素地质测年结果表明，泰山岩群下部地层雁翎关岩组（含原柳杭组下亚组）岩浆结晶锆石SHRIMPUPb年龄（2747±7）Ma，孟家屯岩组碎屑锆石内核SHRIMPUPb年龄（2717±33）Ma、（2742±23）Ma，均属新太古代早期，形成年龄为2750～2700Ma；泰山岩群上部地层山草峪岩组最年轻的碎屑锆石(2544±6)Ma，被峄山岩套石英闪长岩和傲徕山岩套二长花岗岩侵入，它限制了地层形成时代不晚于2530Ma，柳杭岩组（原柳杭组上亚组）最年轻的碎屑锆石(2524±7)Ma，均属新太古代晚期，被峄山岩套石英闪长岩和傲徕山岩套二长花岗岩侵入，形成年龄为2550～2530Ma。

Abstract:

As showed by precise isotope geological dating results, magmatic euhedral zircon SHRIMP UPb age of Yanlingguan formation (including lower sub-formation of the former Liuhang formation) in the lower part of Taishan group is (2747±7) Ma, detrital zircon kernel SHRIMP U-Pb age of Mengjiatun formation is (2717±33) Ma and (2742±23)Ma. They all belong to early Neoarchean period, and the formation age is 2750~2700Ma. The youngest detrital zircon of upper Shancaoyu formation in Taishan group is (2544±6) Ma. It is intruded by quartz diorite in Yishan rock suite and monzogranite in Aolaishan suite. It limits the strata forming age not later than 2530 Ma. The youngest detrital zircon of Liuhang group (the original upper sub-formation of Liuhang group) is (2524±7)Ma, and belongs to late period of late Archean period. It is intruded by quartz diorite of Yishan rock suite and monzonite granite of Aolaishan rock suite. Its formation age is 2550~2530Ma.