华北克拉通南缘中—新元古界沉积充填特征及演化

华北克拉通南缘中—新元古代地层广泛发育、出露较好。以华北克拉通南缘熊耳裂陷槽中—新元古代地层为研究对象，在总结对比前人研究成果的基础上，以4条典型基干剖面实测、3条重点辅助剖面观察与描述，从岩石颜色、岩石组合类型、岩石结构、沉积构造等众多方面，对华北克拉通南缘中—新元古界的沉积相类型、特征、展布规律以及沉积充填序列进行了深入分析。结果表明:1）研究区中—新元古界发育障壁型海岸相、无障壁型海岸相、浅海陆棚相、碳酸盐岩台地相、扇三角洲相及冰川相6种沉积相、10种亚相及15种微相；并详细阐述了各种相、亚相以及微相的沉积特征；2）明确了研究区中—新元古代在不同地质时期发育的主要沉积相类型及特征；3）深入探讨了研究区中—新元古界的沉积充填特征，并将其划分出大陆裂谷早期沉积（熊耳群）、大陆裂谷晚期沉积（小沟背组—云梦山组）、中元古代被动大陆边缘沉积（白草坪组—黄连垛组）和新元古代被动大陆边缘沉积（董家组—东坡组）等4个沉积充填序列。

Sedimentary Filling Characteristics and Evolution of Meso?Neoproterozoic Strata in the Southern Margin of the North China Craton

The Meso?Neoproterozoic strata in the southern margin of the North China Craton （NCC） are well developed and exposed. In this study， after summarizing and comparing the results of previous work， four typical fundamental profiles and three key auxiliary profiles were observed and described， and an in?depth analysis was conducted on the types， characteristics， distribution of sedimentary facies and sedimentary sequences from the aspects of rock color， rock association type， rock structure and sedimentary structure. These showed that， in the study area， there are six sedimentary facies， 10 subfacies and 15 microfacies comprising barrier?type coastal facies， barrier?free coastal facies， neritic shelf facies， carbonate platform facies， fan delta facies and glacial facies. The sedimentary characteristics of the various facies， subfacies and microfacies are described in detail， defining the main types and characteristics of the sediments from different geological periods of the Meso?Neoproterozoic. The sedimentary filling characteristics are discussed in depth. The strata are divided into four sedimentary sequences: early continental rift deposits （Xiong’er Group）； late continental rift deposits （Xiaogoubei?Yunmengshan Formations）； passive continental margin deposits of the Mesoproterozoic （Baicaoping?Huanglianduo Formations）； and passive continental?margin deposits of the Neoproterozoic （Dongjia?Dongpo Formations）.