宿州地区震旦系望山组主要沉积类型及其形成环境分析

安徽省宿州地区震旦系望山组因碳酸盐岩中含有大量形态复杂的微晶碳酸盐脉体(即臼齿构造)而得到了广大研究者的深入研究.该组中除含有碳酸盐岩、泥岩和页岩等正常海相沉积外,还记录了生物沉积和特征明显的地震、风暴、海啸等事件沉积过程和风化壳残积,沉积环境复杂多变.该组碳酸盐岩中臼齿构造、缝合线构造、滑塌构造、交错层理、冲刷构造等沉积构造具有较好的事件沉积指示意义.该组事件沉积的特征表明,当时频繁的地壳活动是造成事件沉积及复杂沉积环境的主要原因.

The analysis of the depositional types and the environments of the Wangshan Formation of Sinian in Suzhou Area, Anhui Province

The Wangshan Formation of Sinian in Suzhou area, Anhui Province has been well studied because of the complicated carbonatic veins (molar-tooth structures) in the carvonatites. Besides normal carbonatites, mudstone and shales, biologic deposits, event deposits of earthquakes, storms snd tsunami as well as ancient weathering crust were recorded in the Wangshan Formation, indicating a very complicated sedimentary environment of the formation. The depositional structures in the carbonatites, including the molar-tooth structures, stylolitic structures, slump structures, cross stratification and erosive structures, have obvious indicative significance of the event deposition. The analysis of the event deposits indicates that the main cause for the events deposits and complicated sedimentary environments lies in the frequent diastrophic activities during that period.