摘要
The Mengentaolegai intrusive body,emplaced in the Late Paleozoic epimetamorphic series in Xingan-Mongolia orogenic belt,is lithologically classified into medium-fine-grained tonalite,granodiorite and monzogranite,with the mineral assemblages and petrochemical characteristics of S-type granite.The LA-ICP-MS zircon U-Pb isotopic age dating results of the granodiorite and monzogranite are 234 ±1 Ma and 230 ±1 Ma,respectively,in Middle Triassic,which represents the invasion time of the Mengentaolegai intrusive body.