山东省中部上寒武统碳酸盐风暴沉积的综合模式

发布时间：2018-06-23 10:25

本文选题：风暴岩 + 碳酸盐岩　；参考：《地球科学》2017年01期

【摘要】：我国的碳酸盐风暴岩丰富多样,但前人对不同环境风暴岩的沉积作用、沉积序列和沉积模式的总结还不够完善.山东省中部上寒武统炒米店组碳酸盐风暴岩发育频繁,分布广,提供了全面分析风暴沉积作用的理想场所.基于该区详实的露头观察,可识别出冲刷面、渠模、丘状交错层理等典型的风暴沉积构造,以及砾屑灰岩、递变层理含砾砂屑灰岩-砂屑灰岩、纹层状粉-砂屑灰岩等风暴岩类型.根据砾屑颜色、磨圆度、排列方式、支撑结构、充填物等岩石学特征,研究区首要发育的砾屑灰岩可被细分为紧密堆积棱角状砾屑灰岩、基质支撑砾屑灰岩、砂屑支撑砾屑灰岩、水平-叠瓦状砾屑灰岩和放射状排列砾屑灰岩5种岩相类型,其分别归属于台前缓坡带原地-近源堆积、碎屑流、高密度-低密度浊流、风暴砾滩和风暴涡流沉积.对台前缓坡、台地边缘和开阔台地等不同环境的风暴沉积序列进行了归纳,建立了缓坡型碳酸盐台地风暴沉积的综合模式,并指出研究区频繁的风暴作用与全球气候变暖、海平面上升以及地震活动存在密切联系.研究表明较多台地边缘发育的大型渠模构造,其充填砾屑呈放射状排列,指示了渠模的风暴涡流成因.
[Abstract]:The carbonate storm rocks in China are rich and diverse, but the previous summary of sedimentary processes, sedimentary sequences and sedimentary models of storm rocks in different environments is not perfect. The carbonate storm rocks of the Chaomidian formation of the Upper Cambrian in the central Shandong Province are frequently developed and widely distributed, which provides an ideal place for the comprehensive analysis of storm deposition. Based on the detailed outcrop observation in this area, typical storm sedimentary structures such as scour surface, channel model, dome interlaced bedding, and gravelly limestone, gravel-bearing gravel-sand limestone, can be identified. Storm rock types such as laminated silt-sand limestone. According to the petrological characteristics of gravel color, grinding roundness, arrangement mode, supporting structure, filling and so on, the most developed gravelly limestone in the study area can be subdivided into closely packed kernel-shaped gravelly limestone, and the matrix supports gravelly limestone. There are five lithofacies types of gravel limestone supported by sand debris, horizontal and imbricate gravelly limestone and radial arrangement gravel limestone, which belong to in situ near source accumulation, clastic flow, high density and low turbidity flow in the front gentle slope zone, respectively. Storm Gravel Beach and Storm Vortex deposition. The storm deposition sequences in different environments, such as the gentle slope, the edge of the platform and the open platform, are summarized, and the integrated model of the storm deposition of the gentle slope carbonate platform is established, and the frequent storm action and global warming in the study area are pointed out. There is a close relationship between sea level rise and seismicity. The study shows that the large canal model structure developed on the edge of the platform is filled with gravel arranged radially indicating the origin of storm eddy current of the channel model.
【作者单位】：中国地质大学构造与油气资源教育部重点实验室;中国地质大学资源学院;
【基金】：国家重大专项大型油气田及煤层气开发子课题(No.2016ZX05026-003-004)
【分类号】：P512.2

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