粤北大宝山矿区徐屋岩体SHRIMP 锆石U-Pb年龄及其地质意义
SHRIMP zircon U-Pb ages of Xuwu subdacitic porphyry in the Dabaoshan ore district of northern Guangdong Province and its geological implications
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摘要: 徐屋岩体位于粤北大宝山矿区南部，是区内花岗岩体的重要组成部分。首次采用SHRIMP锆石 U-Pb定年方法对徐屋岩体进行了年代学研究，获得其成岩年龄为441.2±4.2Ma（MSWD=1.02），表明其为加里东期岩浆活动的产物。结合前人年龄数据表明，大宝山矿区存在有加里东期和燕山期2次成岩作用和1次成矿作用，且成矿作用与燕山期花岗岩关系密切。Abstract: 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.
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