徐州赵圩地区新元古界风暴沉积序列类型及其水深控制

The Neoproterozoic storm deposits in the Zhaowei region, Xuzhou,Jiangsu: Depositional sequences and their bathymetric controls

广义的风暴沉积是自然界内外地质营力促使海水产生足够大的漩涡流,对海底及海岸冲蚀形成的一种事件沉积。徐州赵圩地区发育丰富的晚元古代风暴沉积记录,通过野外露头剖面岩性观察与室内整理,划分出7种不同水深的风暴沉积序列类型。根据冲刷面、滞积层、丘状交错层理(HCS)、液化卷曲层理等典型风暴特征,可将这7种序列与浅海陆棚边缘-台地前缘缓斜坡-台前潮上环境的连续沉积相对应。据此分析了风暴沉积序列与水深的关系,并针对本区的沉积特点对风暴沉积成因进行探讨。

The Neoproterozoic storm deposits are well developed in the Zhaowei region, Xuzhou, Jiangsu, and may be grouped into seven depositional sequences in different sedimentary environments. These storm deposits are characterized by scour surface, lag deposits, hummocky cross-bedding and liquefied crinkled bedding. The above- mentioned seven depositional sequences of the storm deposits may also be corresponded with the continuous deposits in the shallow shelf margin-platform foreslope-plafform supratidal environments, and display a close correlation with water depths. Finally a genetic model is proposed for the storm deposits in the Jiayuan Formation.