• 责任者：Duan Chao (State Key Laboratory of Geological Processes and Mineral Resources ; School of the Earth Sciences and Resources ; China University of Geosciences ; Beijing 100083 ; China) ; Mao Jingwen
• 刊名：Acta Geologica Sinica
• 出版年：2011
• 卷期：85(7)
• 关键词：玢岩铁矿床 ; porphyrite iron deposit ; 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.1159-1171
• 图表：5 illus., 1 table, 120 refs.
• 分类号：1001
• issnNo：ISSN0001-5717
• isbnNo：CN11-1951/P

Ningwu Basin is one of the important ore districts in the Middle-Lower Reaches of the Yangtze River Belt, China, and also a base for constructing the metallogenic model of porphyry-type iron deposits. Aoshan iron deposit is one of the reprehentive porphyry-type iron deposits in Ningwu Basin. Two types of magmatic rocks closely related to mineralization were selected as the study objects. Detailed zircon U-Pb age dating for magmatic rock samples yields an age of (131.7±0.7) Ma for gabbrodiorite porphyrite and (126.1±0.5) Ma for granodiorite porphyry cutting across the main orebodies using LA-MC-ICP-MS. According to the relationship between petrogenesis and mineralization, the age of mineralization of Washan iron deposit is 131.7 ~ 126.1 Ma, suggesting that it belongs to the Early Cretaceous. The mineralization associated with early magmatism in Ningwu basin occurred in an extensional tectonic regime, possibly induced by lithospheric thinning.