徐州地区寒武纪灰质障壁砂坝沉积模式研究

Depositional Model of Lime Sand Barriers of Cambrian in Xuzhou Area

研究了典型的地层剖面 ,揭示了徐州地区寒武系的陆表海沉积地质背景、岩性组成和碳酸盐岩岩性特征 ,探讨了徐州地区寒武系形成的主要沉积环境和成岩环境 ,总结了主要沉积、成岩环境的沉积、成岩特征 ,提出了徐州地区寒武纪经历的四个主要沉积演化阶段和发育的三类沉积成岩序列 ,认为徐州地区寒武系形成于陆表海灰质障壁砂坝沉积模式 .

The Cambrian system in Xuzhou area is a group of deposits dominated by clean water carbonate rocks formed under the epicontinental sea. And these carbonate rocks are remarkably characterized by well developed grain limestone, abundant grain types and grain forming with algae participation. It mainly developed in the tidal flat deposits, restricted epicontinental deposits and lime sand barrier deposits, as well as such important diagenetic environments as the supratidal, the intertidal, the subtidal and the fresh water genetically related to the depositional environments. Xuzhou area underwent four stages of the early Cambrian slow ingression, the middle Cambrian regression within Maozhuang Xuzhuang ages, the large scaled middle Cambrian ingression within Zhangxia age and the late Cambrian slow ingression regression, and formed different overlay and combination of three types of depositional diagenetic sequences, the sand barrier growing, the prograding and the retrograding, in the Cambrian strata. Consequently, the conclusion is drawn that the Cambrian system was formed in the epicontinental lime sand barrier depositional model.