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The Origin of Siliceous Rock in Wumishan Formation, Jixian, Tianjin
Author(s): 
Pages: 70-76
Year: Issue:  1
Journal: ACTA SEDIMENTOLOGICA SINICA

Keyword:  硅质岩风暴序列雾迷山组;
Abstract: 中晚元古代华北地台处于燕辽拗拉谷的张裂期,有利于形成风暴流.蓟县雾迷山组广泛发育风暴沉积,在硅质条带白云岩中发育硅质砾屑具奇特的菊花状构造,这种构造形成于成岩作用后期,在尚未完全固结成坚硬的岩石时期,遭遇风暴破坏,将原有水平层理打碎,继而被风暴流搅起,风暴流的涡动使得岩石碎片直立,或者呈发散状,后经成岩作用保留了这种构造形态,与上下岩层形成典型的风暴沉积序列.通过野外与镜下观察并结有机地球化学分析得出,蓟县地区雾迷山组硅质条带白云岩发育典型的风暴沉积序列和挤压滑塌序列,风暴硅质岩具丘状形态,内部菊花状构造为近源风暴产物,其中硅质岩来源于海底热水活动.沉积环境推测为碳酸盐台地前缘斜坡.
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