福建平潭君山火山岩系地质特征及其形成时代的讨论

在详细的野外地质调查及室内研究的基础上，本文对君山火山岩系的地质特征（主要是火山岩相学特征）进行了深入的研究，并提出了一个火山岩相学的新概念－－火山岩相系。根据火山岩相学特征，结合岩石组合、岩石化学、地球化学等特征，详细分析了该火山岩系的岩浆起源、岩浆演化、形成环境及火山活动史。同时，根据地质接触关系、同位素年龄及地层对比等，将该火山岩系的形成时代定为晚侏罗世，火山岩地层层位南园组第三段。

Discussion on the Geological Characteristics and the Time of theJunshan Volcanic Sequence in Pintan County, Fujian Province

Based on the geological survey in field and the study in indoor, in this paper the authormade a through study of the geological .Characteristics, especially, the volcanic facieologicalcharacters, and advanced a new term about volcanic facieology-volcanic factes system.According to the volcanic facieological characters and combining with the volcanicassociation, volcanic lithochemistry, volcanic geochemistry and so on, the magma basin andevolution, environment, activity history of the volcanic system are under a detail discussion.Additionally, according to the relation of geological contact, isotopic ages and stratacorrelation, it is inferred that the volcanic sequence was formed in Late Jurassic epoch andbelongs the third segment of Nanyuan Formation.