• 责任者：Chen Zhihong (Nanjing Center ; China Geological Survey ; Nanjing 210016 ; China) ; Xing Guangfu
• 刊名：Acta Geologica Sinica
• 出版年：2011
• 卷期：85(7)
• 关键词：金矿 ; gold ores ; 铜矿 ; copper ores ; 铀—铅计时 ; U-Pb dating ; 长江中下游成矿带 ; Metallogenic Belt of Middle and Lower Reaches of Yangtze River
• 页码：p.1146-1158
• 图表：4 illus., 1 table, 82 refs.
• 分类号：1001
• issnNo：ISSN0001-5717
• isbnNo：CN11-1951/P

The Jiujiang-Ruichang area is an important ore concentrated district in the western section of the Cu-Fe-Au(S) mineralization belt of the Middle-Lower Reaches of the Yangtze River. Five poorly-studied granitic rocks at Dingjiashan, Yangjisha, Baoshan, Tongling, and Daliang, which are closely related to Cu-Au mineralization, were selected to conduct zircon LA-ICP-MS U-Pb dating and explore its geological significance. Zircon U-Pb dating results indicate that these granitic rocks formed in Late Jurassic to Early Cretaceous at (145.4±1.2) Ma, (144.8±1.3) Ma, (143.6±1.2) Ma, (141.2±1.3) Ma and (146.4±1.2) Ma, respectively, and may be the product of the Cretaceous magmatic activity. In combination to regional geological data, it is believed that the petrogenetic and metallogenic event in the Jiujiang-Ruichang ore concentrated district may occur in a transitional environment from the early orogeny stage of the paleo-Pacific Plate subduction to the subsequent back-arc extensional environment.