Identification of Mesoproterozoic zircons in a Triassic dolerite from the Liaodong Peninsula, Northeast China  

作　　者：YANGJinhui WUFuyuan ZHANGYanbin ZHANGQi SimonA.Wilde 

机构地区：[1]InstituteofGeologyandGeophysics,ChineseAcademyofSciences,Beijing100029,China [2]DepartmentofAppliedGeology,CurtinUniversityofTechnology,EO.BoxU1987,Perth,WesternAustralia6845,Australia

出　　处：《Chinese Science Bulletin》2004年第18期1958-1962,共5页

摘　　要：Thick Neoproterozoic strata are widespread in the Dalian region, Liaodong Peninsula, Northeast China. SHRIMP zircon U-Pb dating of dolerite intruded into Neo-proterozoic strata gives its emplacement age as 211±2 Ma. However, abundant 0.9—1.1 Ga zircons are identified in the dolerite. The age of 1125±38 Ma corresponds with the Grenvillian collisional event. The zircons of 904±15 Ma ages have high Th/U ratios (1.31—2.25) and magmatic oscillatory zones, being possibly related to later magmatism induced during amalgamation of Rodinia.Thick Neoproterozoic strata are widespread in the Dalian region, Liaodong Peninsula, Northeast China. SHRIMP zircon U-Pb dating of dolerite intruded into Neo-proterozoic strata gives its emplacement age as 211±2 Ma. However, abundant 0.9—1.1 Ga zircons are identified in the dolerite. The age of 1125±38 Ma corresponds with the Grenvillian collisional event. The zircons of 904±15 Ma ages have high Th/U ratios (1.31—2.25) and magmatic oscillatory zones, being possibly related to later magmatism induced during amalgamation of Rodinia.

关 键 词：中元古代 锆石 三叠纪 粗粒玄武岩 辽东半岛 华北地区 U-PB年龄 测定 

分 类 号：P618.85[天文地球—矿床学] P575[天文地球—地质学]