BASIC CHARACTERISTICS OF MESO-CENOZOIC PALEOVOLCANIC STRUCTURES IN FUJIAN PROVINCE

Fujian province lies within the circum-Pacific paleovolcanic belt, in the middle section of the Zhejiang-Fujian-Guangdong volcanic mobile belt. There, Mesozoic volcanic rocks, particularly those of Late Jurassic to Early Cretaceous ages, are very well developed. In Late Jurassic to Early Cretaceous times the volcanic activity reached a climax, so the extrusives of these ages cover one-third of the area of the whole province. Rocks are dominated by intermediate-acid volcanic rocks, which possess the characteristics of the continental margin calc-alkaline rock series There are mainly two types of volcanic eruption, the fissure type and the central type.The volcanic rock facies formed may be classified into explosive facies, effusive facies, viscous lava extrusion facies, volcanic vent facies, subvolcanic facies, volcanic-intrusive facies and eruptive-sedimentary facies.The volcanic structures are divided into six orders. Order Ⅰ is the circum-Pacific volcanic belt, order Ⅱ is the Zhejiang-Fujian-Guangdong volcanic mobile belt, order Ⅲ includes zones of volcanic eruption and volcanic basement uplift zones, order Ⅳ comprises areas（basins） of volcanic eruption and volcanic ring associations, order Ⅴ includes calderas,domes, linear volcanoes, cone—in-cone volcanoes, composite volcanoes and cupolas, and order Ⅵ includes central-type and fissure-type volcanic vents and cryptoexplosive breccia structure. The paper also preliminarily discusses the relations between volcanic structures and regional structures.