中文摘要：

安徽庐枞中生代火山岩盆地是长江中下游成矿带重要的铁铜多金属矿集区，区域发育早白垩世火山一侵入岩浆活动；近年来，随着盆地深部找矿工作的推进，发现了大量的深部隐伏侵入体。文章对小岭地区新近施工的钻孔进行了详细的观察与取样，并对深部侵人体进行了锆石U-Pb测年，明确了隐伏正长岩形成于（132．6±1．9）Ma，二长岩形成于（132．5±0．6）Ma，属于砖桥旋回末期岩浆活动的产物。文中对小岭地区的成岩成矿作用时限进行了讨论。

英文摘要：

The Lujiang-Zongyang Mesozoic volcanic basin in Anhui Province is an important ore concen- trated district in middle-lower Yangtze River valley metallogenic belt. There is early Cretaceous vol- canic-intrusive magmatism in this district. In recent years, a large number of the concealed intrusions in Lujiang-Zongyang basin have been discovered with the deep prospecting. Based on systematic inves- tigations, LA-ICP MS zircon U-Pb dating of the concealed intrusions in Xiaoling area is carried out. The analyses results show that the ages of concealed syenite and monzonite are （132. 6±1.9） Ma and （132.5±0.6） Ma respectively, which formed at the late stage of Zhuanqiao Formation. The duration of magmatism and mineralization in Xiaoling area is discussed.