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北京及邻区的中元古代大红峪组中发育着与火山事件有关的沉积相 ,主要包括两种基本类型 :火山源硅质—陆源砂—碳酸盐岩混积相和火山碎屑重力流沉积 ,后者又可分为火山碎屑基浪沉积相和火山—沉积角砾碳酸盐岩混积相。初步分析表明 ,大红峪期大量的硅质沉积主要来自同期的水下火山活动 ;火山碎屑基浪沉积与火山口内残余热气冲破熔岩封堵而爆发泄出 ,造成一定范围的海水涌浪作用有关。
There are two sedimentary facies related to volcanic events in the Mesoproterozoic Dahongyu Formation in Beijing and its adjacent areas, including two basic types: volcanic source siliceous-terrigenous sand-carbonate mixed-phase and volcaniclastic gravity flow The latter can be divided into volcanic sedimentary basement and volcanic-sedimentary breccia carbonate mixed phase. The preliminary analysis shows that a large amount of siliceous sediments during the Dadi valley mainly come from underwater volcanic activities during the same period. The volcanic sediments and basement waves broke out due to the lava sealed by residual heat in the crater, causing a certain range of seawater surge related effects .