CAJ | 학술논문

基于对川北米仓山西部旺苍县鼓城乡唐家河下寒武统仙女洞组露头剖面的观察与镜下分析发现，仙女洞组下段由生物碎屑泥晶灰岩（L）、粉砂质泥岩（M）、似瘤状砾屑灰岩（L′）、角砾灰岩（R）、藻凝块灰岩（A）和含生屑钙质砂岩（S）组合而成，其以角砾灰岩、似瘤状砾屑灰岩和藻凝块灰岩为特征，且发育异地岩块和滑塌变形构造。进一步分析认为：L-M岩石组合为正常的斜坡环境低能沉积；L′-R 岩石组合中的角砾灰岩为上斜坡生物灰泥丘崩坍滑动至下部而形成的，似瘤状砾屑灰岩可能是由于 L-M 岩石组合快速沉积导致沉积物失稳滑动变形、上斜坡生物灰泥丘崩落角砾致使的差异压实和滑动、以及后期物质成分差异引起的压溶作用等共同作用的结果，从而使灰质层发生破碎并被泥质包围形成断续的砾屑状，甚至轻微的位移，进而形成条带特征不明显的杂乱变形构造；微生物岩（Mb）组合为上斜坡的灰泥丘沉积；S-M 岩石组合为斜坡上部的浊流沉积。根据上述分析结果建立米仓山西部仙女洞组碳酸盐岩台缘斜坡沉积模式，表明仙女洞组沉积早期米仓山西部存在台缘斜坡相沉积。
기우대천북미창산서부왕창현고성향당가하하한무통선녀동조로두부면적관찰여경하분석발현，선녀동조하단유생물쇄설니정회암（L）、분사질니암（M）、사류상력설회암（L′）、각력회암（R）、조응괴회암（A）화함생설개질사암（S）조합이성，기이각력회암、사류상력설회암화조응괴회암위특정，차발육이지암괴화활탑변형구조。진일보분석인위：L-M암석조합위정상적사파배경저능침적；L′-R 암석조합중적각력회암위상사파생물회니구붕담활동지하부이형성적，사류상력설회암가능시유우 L-M 암석조합쾌속침적도치침적물실은활동변형、상사파생물회니구붕락각력치사적차이압실화활동、이급후기물질성분차이인기적압용작용등공동작용적결과，종이사회질층발생파쇄병피니질포위형성단속적력설상，심지경미적위이，진이형성조대특정불명현적잡란변형구조；미생물암（Mb）조합위상사파적회니구침적；S-M 암석조합위사파상부적탁류침적。근거상술분석결과건립미창산서부선녀동조탄산염암태연사파침적모식，표명선녀동조침적조기미창산서부존재태연사파상침적。
In this paper,a case study of the Lower Cambrian Xiannüdong Formation in Tangjiahe, Wangcang County of western Micang Mountain was conducted.On the basis of the observation and analysis with microscope,the bottom of Xiannüdong Formation is composed of six major rock types,such as bio-clastic mudstone,silty mudstone,analogous-nodular limestone,rudstone,algal clot limestone and cal-careous sandstone with bioclastic,and is characterized by rudstone,analogous-nodular limestone,algal clot limestone,slump deformation structure and slide structure.Further analysis shows that L-M associa-tion was mostly deposited in low-energy slope environment.The rudstone,as a part of the L′-R associa-tion,deposited by the collapse and slump from the mud mounds in upper slope.The other part,analo-gous-nodular limestone,deformed from L-M association,was supposed synthetical effects by the collapse and slump from mud mounds,the force of differential compaction and the pressure solution caused by the differences of the components.These effects can be used to break the limestone layer to be rudstone shape, even lead to generate some slightly displacement.As a result,L-M,also be called ribbon rocks,become littery deformation structures.Mb association can be considered a mud mounds environment in upper slope. S-M association was deposited in turbidity environment of upper slope.After establishing the sedimentary model and the four associations of slope,all of the evidences indicate that at least during the Early Cam-brian Xiannüdong period,the platform marginal slope was developed in western Micang Mountain.