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对辽吉裂谷带吉林段集安群火山岩和碎屑沉积岩以及裂谷带内的花岗岩进行了LA-ICP-MS锆石U-Pb的年代学研究.测年结果显示,集安群火山岩形成于2 156~2 189Ma,并于1 870~1 881Ma接受区域变质作用改造.伴随集安群的火山-沉积和变质作用,有2期花岗岩侵入:一期形成于裂陷期的2 156~2 189Ma;另一期形成于造山期的1 870~1 881Ma.同时,碎屑锆石和捕获锆石获得了2 471~2 494Ma和2 633~2 653Ma的岩浆成因锆石年龄,代表结晶基底的2次岩浆事件.集安群的物质来源于太古宙基底和裂陷期的岩浆事件产物.
The LA-ICP-MS zircon U-Pb dating of the Jijian volcanic rocks and clastic sedimentary rocks and the rift zone in the Jilin section of the Liaogi rift zone has been carried out. The dating results show that the Ji’an Group volcanic rocks formed In 2 156 ~ 2 189Ma, and in 1870 ~ 1881Ma metamorphism of the role of transformation metamorphic group with the volcano - sedimentation and metamorphism, there are two stages of granite intrusion: a period of formation in the rifting 2 156 ~ 2 189Ma, and the other was formed during the orogenic period from 1870 to 1881 Ma.At the same time, zircons from the detrital zircons and the zircons from which the zircons were captured have magmatic zircon ages of 2 471 ~ 2 494Ma and 2 633 ~ 2 653Ma, representing 2 Sub-magmatic events. The Ji’an Group material is derived from the magmatic event products of the Archean basement and rifting.