福建建宁均口地区早白垩世火山地质特征

Geological Characteristics of Early Cretaceous Volcanic rocks in the Junkou Area of Jianning, Fujian Province

建宁均口地区早白垩世火山岩可划分为２个组４个段，火山岩双峰式组合特征明显，火山岩相特征及空间分布特征显著。区内发现７个火山机构和２个寄生火山，安远－都畲线状火山群由５个受裂隙控制的中心式火山机构所组成，是寻找金矿和非金属矿的有利部位。火山活动的构造环境为拉张环境；岩浆来源可能源于地壳和上地幔。

he paper focuses on the discussion of the geological characteristics of early Cretaceous volcanic rocks in the Junkou area of Jianning, Fujian Province.The volcanic rocks are characterized by the obvi ous bimodal assembly and can be divided into the upper and lower formation and four members, of which there are distinct features of the volcanic factes and spacial distribution. There are 7 volcanic ap paratus and 2 parasitic volcanoes in the surveyed area. The Anyuan-Doushe linear volcanic group con sists of 5 fault-controlled central-type volcanic apparatus, which is a favourable area for prospecting gold and non-metal ores. It is inferred that the tectonic environment of the volcanic activities in the area belongs to an extension and that the magma is derived from the crust and the upper mantle.