【摘要】 在陆相湖盆中,地震引起的各种作用力可以对各种先成沉积物进行改造而形成原地震积岩,同样地震可引发涌浪、浊流及碎屑流而形成地震涌浪沉积及震浊积岩.通过大量岩心观察描述和成像测井资料分析,首次提出惠民凹陷中央隆起带沙河街组含有丘状交错层理的碎屑岩与典型的原地震积岩(包括震裂岩、震褶岩、自碎屑角砾岩等)紧密共生,当属于地震作用引发涌浪的沉积产物.本区地震涌浪沉积中发育丘状及洼状层理、包卷层理、平行层理、块状层理、波痕、冲刷及截切面等沉积构造.根据沉积特征和分布位置,本区地震涌浪沉积划分为两种类型,即位于涌浪基面附近的含塑性泥砾的搅动型和涌浪基面与正常浪基面之间的回流型.垂向上地震涌浪沉积一般位于原地震积岩之上,震浊积岩之下,组成完整的原地震积岩—地震涌浪沉积—地震浊积岩序列或原地震积岩—地震涌浪沉积序列.本区地震涌浪沉积的发现和研究,将为地质学家识别陆相湖盆地震事件沉积提供对比标准.更多还原

【Abstract】 The seismism can reform the formed sediments and develop seismites in lacstrine basin, as well as induce surging wave, turbidity current and debris flow and then form seismic surge wave deposits and seismoturbidite rocks. Based on core observation and image logging analysis, the author points out for the first time that the clastic rocks harving hummocky cross-straitification and typical seismites (shattered rocks, seismic corrugated rocks and autoclastic breccia) coexist in the third member of Shahejie Formation of central uplift belt in Huimin depression, therefore they belong to the result of surge wave deposits. Many sedimentary structures develop in the seismic surge wave deposits of this area, such as hummocky cross-stratifyication(HCS) and swaley cross-stratifyication(SCS) convolute bedding, parallel bedding, massive bedding, ripple and scouring and truncated surface, etc. According to the sedimentary characteristics and distribution,the seismic surge wave deposits are classified into two types, that is, the stirring type seismic surge wave deposits with mud gravel having plastic feature near the surge base and the undertow type seismic surge wave deposits between surge wave base and normal wave base. Vertically, the seismic surge wave deposits are usually above seismite and under seismoturbidite rocks. They compose a integrated sequence of seismite-seismic surge wave deposits-seismoturbidite rock or a sequence of seismite-seismic surge wave deposits. The discovery and research of seismic surge wave deposits caused by seismism can provide geologists with one of correlation standards for identifying the seismic event deposition of lacstrine basin.更多还原