化工矿产地质2025，Vol.47Issue(1)：11-20,10.
粤东宝山嶂地区早白垩世花岗斑岩锆石年代学、地球化学特征及其地质意义
Zircon Choronology,and Geochemical Characteristics and Their Geological Significance of the Early Cretaceous Granite Porphyry in the Baoshanzhang Area,Eastern Guangdong
摘要
Abstract
The Baoshanzhang area in eastern Guangdong is located at the southwest end of the volcanic-intrusive rock zone along the southeast coast of the south China continent.In this paper,the zircon LA-ICP-MS U-Pb age,trace elements and Lu-Hf isotopes of the granite porphyry exposed in this area are studied to reveal the formation age,and to explore the genesis of zircon and magma source area.Zircon U-Pb dating shows that the weighted average age of the Baoshanzhang granite porphyry is 108.71±0.83Ma(MSWD=3.5,n=22),which belongs to the Late Early Cretaceous magmatic product.Through the Th/U contents of zircon,obvious oscillatory circle belts,as well as the PrN-LaN and LaN-(Sm/La)N plots,show that zircon is magmatic zircon.Combined with the Lu-Hf isotope characteristics of the Baoshanzhang granite porphyry,it is judged that the Baoshanzhang granite porphyry is the product of remelting of crustal rocks,and the magmatic material mainly comes from the transformation and reworking of the lower crust.关键词
早白垩世/锆石U-Pb定年/微量元素/Lu-Hf同位素Key words
Early Cretaceous/Zircon U-Pb dating/Trace element/Lu-Hf isotope分类
地质学引用本文复制引用
陈南通,李媛,胡昆,何翔,叶升明,李锐,尼玛央金..粤东宝山嶂地区早白垩世花岗斑岩锆石年代学、地球化学特征及其地质意义[J].化工矿产地质,2025,47(1):11-20,10.基金项目
广东省地质勘查与城市地质专项 广东东源地区1∶5万区域地质调查(编号:2022-17)、广东1∶5 万双江圩、义合圩、河源县、柏埔圩幅区域地质调查(编号:2023-16)、广东1∶5万蓝塘、观音阁幅区域地质调查(编号:2023-19) （编号:2022-17）
