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以松辽盆地东南缘营城组二段两类火山碎屑岩(沉凝灰岩、凝灰质砂岩)为研究对象,进行了火山碎屑粒度特征、碎屑组成和火山碎屑岩相研究.结果显示,火山碎屑搬运除受火山作用激发控制外,还受牵引流、重力流以及牵引流和重力流的双重机制影响.火山碎屑微观特征、成因分析和岩相分析认为,本区火山碎屑堆积主体为热基浪堆积和热碎屑流堆积,部分为空落堆积.火山碎屑组成特征为晶屑含量多,玻屑和岩屑含量少,且岩屑仅在较粗粒级颗粒组成中存在.研究认为,本区发育的火山碎屑为沉积环境中的再搬运火山碎屑,共识别出4种火山碎屑岩相,河流故道上的热基浪,河流故道上的热碎屑流,冲积平原上的热基浪和空落相.建立了松辽盆地东南缘露头区营城组二段河流-冲积平原沉积环境的再搬运火山碎屑岩相模式.
Two types of pyroclastic rocks (tuffaceous limestone and tuffaceous sandstone) of the second member of Yingcheng Formation in the southeastern margin of Songliao Basin were selected as study objects, and the characteristics of volcaniclastic granularity, detrital composition and volcaniclastic facies were studied. In addition to volcanic activation control, volcanic debris transport is also affected by the dual mechanism of traction flow, gravity flow, traction flow and gravity flow.Micro characteristics, genetic analysis and facies analysis of volcanic debris suggest that volcanic debris The main body of the accumulation is the accumulation of thermal wave and the accumulation of hot debris flow, and the part is emptied and accumulated.The composition of volcano detritus is characterized by more crystal content, less vitrified and lithic debris, The study suggests that volcanic debris developed in this area is re-transported pyroclastic debris in the sedimentary environment and identified four types of volcaniclastic facies, hot basal waves on the river course, hot debris on the river course Flow and alluvial plains, and the re-carrying volcaniclastic lithofacies model of the sedimentary environment of the second member of Yingcheng Formation in the outcropping southeastern part of Songliao Basin was established.