SHRIMP zircon U-Pb ages of Xuwu subdacitic porphyry in the Dabaoshan ore district of northern Guangdong Province and its geological implications

The Xuwu subdacitic porphyry is located in the south of the Dabaoshan ore district. This paper reports for the first time the SHRIMP zircon U-Pb age of Xuwu dacitic porphyry (441.2±4.2Ma), suggesting Caledonian. Combined with the previous dating results, the authors conclude that there are two rock-forming stages (Caledonian and Yanshanian) and one ore-forming stage (Yanshanian) in the Dabaoshan ore district, with the mineralization mainly related to the Yanshanian intrusions.