摘要
本区中生代火山岩系是一套由粗面玄武岩—玄武岩—玄武粗安岩—粗安岩—粗面安山岩—粗面岩以及少量流纹岩组成的以橄榄安粗岩系为主，高钾钙碱岩系为辅的岩石组合。并可与中国东部橄榄安粗岩省的火山岩相对比，但Ｋ２Ｏ含量偏低。它形成于最终以拉张性质为主要表现形式的构造环境，其形成不仅与伊泽奈崎板块向欧亚板块斜向俯冲消减伴随的弧后拉张作用有关，而且与扬子板块和华北板块作用的陆内造山及晚期的伸展作用有关，同时受控于先存的古构造环境。
Intensive volcanic activity took place in the Huanghua depression during the late Jurassic—Early Cretaceous.The volcanic rocks consist of trachybasalt,basalt,basaltic trachyandesite,trachyandesite,latite and trachyte with minor rhyolite.They are considered to be a volcanic sequence dominated by the shoshonte series with subordinate high_K calc_alkaline rock series.In comparison with the shoshonite province of eastern China,the volcanic rocks in the Huanghua area have low K 2O.The formation of the shoshonite is the result of the combined action of two tectonic dynamic systems in the dominantly tensile stress field and was also controlled by the paleotectonic setting.
关键词
中生代
火山岩系
构造环境
黄骅坳陷
油气田
Mesozoic volcanic sequence shoshonite series tectonic setting Huanghua depression
