摘要
通过野外剖面实测和镜下薄片鉴定,结合前人的研究结果,探讨贵州遵义松林地区下寒武统清虚洞组陆源碎屑岩与海相碳酸盐岩的混合沉积特征。研究结果表明:清虚洞组混合沉积在微观上表现为碳酸盐岩组分与碎屑岩组分混合形成的混积岩,在宏观上表现为碎屑岩与混积岩呈夹层的形式沉积、碎屑岩与碳酸盐岩交互沉积以及混积岩本身交互沉积形成的混积岩层系;其混合沉积类型有渐变式混合沉积、复合式混合沉积Ⅰ、复合式混合沉积Ⅱ。上扬子地区清虚洞组为远端变陡的缓坡型碳酸盐岩台地混合沉积模式;该地区的海平面整体呈现先上升后下降、水动力条件强弱交替、水体环境由“半清水”过渡为“浑水”再转变为“清水”,沉积环境由中缓坡到外缓坡再到内缓坡。
On the basis of profile measurement and thin section identification,combined with the previous research,the characteristics of mixed deposition of terrigenous fragment and marine facies carbonate in the Lower Cambrian Qingxudong Formation in Songlin area of Zunyi,Guizhou Province is discussed.It shows that,at the microscopic scale,the mixed rock is formed by the mixture of carbonate rock components and clastic rock components.Macroscopically,the mixed rocks occur as intercalation of clastic rock with diamictite or intercalation of clastic rock with carbonate rock,or even intercalation of diamictite by its own.There are three types of mixed sedimentation,including gradient mixed sedimentation,composite mixed sedimentationⅠand composite mixed sedimentationⅡ.The Qingxudong Formation in the upper Yangtze region is a mixed deposition of gently sloping carbonate platform.The sea level in the area experienced first rise and then fall with hydrodynamic conditions alternating between strong and weak,and with the water environment changing from semi clear water to muddy water and to clear water,and with the depositional environment shifting from middle gentle slope to outer gentle slope and to inner gentle slope successively.
作者
赵玲丽
宋金民
刘树根
余晶洁
赵聪
邓双林
李朋武
郑涛
李立基
ZHAO Lingli;SONG Jinmin;LIU Shugen;YU Jingjie;ZHAO Cong;DENG Shuanglin;LI Pengwu;ZHENG Tao;LI Liji(State Key Laboratory of Oil and Gas Reservoir Geology and Exploration, Chengdu University of Technology, Chengdu 610059, China)
出处
《成都理工大学学报（自然科学版）》
CAS
CSCD
北大核心
2020年第5期545-556,共12页
Journal of Chengdu University of Technology: Science & Technology Edition
基金
“十三五”国家科技重大专项(2017ZX05005003-007)
中国石化前导性项目(P16109)。
关键词
下寒武统
清虚洞组
混合沉积
黔北
Lower Cambrian
Qingxudong Formation
mixed sedimentation
northern Guizhou
