中文摘要：

浙闽边界区是东南沿海晚中生代火山岩带中研究较薄弱的地区。本文对该区代表性晚中生代火山岩地层进行了系统的野外调查和锆石U Pb年代学研究，分析了它们的岩性岩相特征，在此基础上解剖了火山作用过程。该区火山活动起止时间为143~111Ma（高峰期143~126Ma），时代属早白垩世，其间存在较长的火山活动沉寂期（126~116Ma），火山作用过程可明显划分为5个阶段。上述研究结论有助于深化对东南沿海早白垩世火山活动时空演化规律的认识。

英文摘要：

The area of Zhejiang-Fujian boundary underwent intense volcanic activities in Late Mesozoic, but have been studied in low degree in the Late Mesozoic volcanic zone of coastal southeast China. Based on comprehensive field investigations and zircon U Pb geochronometry on typical volcanic strata, the writers analyze lithology and lithofacies of the Late Mesozoic volcanic rocks, and propose the geological process of volcanism in this area. Volcanic activities in the study area took place during 143-111 Ma （ with a peak between 143-126 Ma）, i.e., Early Cretaceous, in which occurred a long intermission in 126-116 Ma. The volcano sedimentation process can be divided into five stages, which is conducive to understand temporal and spatial evolutions of Early Cretaceous volcanism in coastal Southeast China.