U-Pb Dating and Hf Isotopic Characteristics of Zircons from Quartz-Diorite in the Yijiang REE-Sc Deposit, Rucheng County, Hunan: Constraints on the Timing of Caledonian Magmatic Activity in South China

• 责任者：Wang Yanbin (Beijing SHRIMP Lab. ; Institute of Geology ; Chinese Academy of Geological Sciences ; Beijing 100037 ; China) ; Wang Denghong
• 刊名：Geology in China
• 出版年：2010
• 卷期：37(4)
• 关键词：石英闪长岩 ; quartz diorite ; 铀—铅计时 ; U-Pb dating ; 铪同位素 ; hafnium isotopes ; 湖南 ; Hunan Province
• 页码：p.1062-1070
• 图表：4 illus., 2 tables, 40 refs.
• 分类号：0801
• issnNo：ISSN1000-3657
• isbnNo：CN11-1167/P

Quartz-diorite intrusion is spatially and temporally associated with the REE-Sc mineralization in the Yijiang REE-Sc deposit, Rucheng County, Hunan Province. To constrain the age of the quartz-dioritic pluton related to REE-Sc mineralization, the authors conducted U-Pb analysis of zircon. Hafnium isotope data were also acquired through laser-ablation multi-collector ICPMS analysis of the zircon. Hafnium analysis shows that the Caledonian quartzdiorite has negative and variable εHf values (-1.9 to -7.6) and Palaeo-Mesoproterozoic (1.5 to 1.9 Ga) depleted-mantle model ages, which is interpreted to reflect derivation from an isotopically heterogeneous mantlecrust mixed source.