中国东南部白垩系综合地层学研究的新进展

New Advances of the Study of Cretaceous Strata in Southeastern China Based on Comprehensive Stratigraphy

笔者以盆地分析学、构造-沉积学、事件地层学、层序地层学等多学科手段对中国东南部白垩系进行综合研究,对过去有争议的、特别是关键性的地层问题,从成因机制上进行分析判断,并提出了一些新的看法。研究认为,该区盆地的形成与演化、构造-沉积旋回、地层相序与层序、地质事件等,主要受控于相同的幕式构造运动,是同一诱因形成的、表现形式不同的地质记录,因而彼此间有成因联系和对应关系,可以互相验证和补充,从而达到深化研究的目的。通过对上述手段所获信息的综合研究,对“塘上组”的时代归属、“丽水运动”是否存在、永康群与“天台群”以及方岩组、中戴组、“赤城山组”等类磨拉石建造间的层位关系等有争议的问题提出了新的认识。最后,还提出了中国东南部各省白垩纪地层的划分对比方案。

Some problems of Cretaceous strata in southeastern China especialy the key horizones which are still in controversy were studied based on comprehensive stratigraphy including basin analysis, tectono-sedimentology, event stratigraphy and sequence stratigraphy, and some new understandings were put forward through synthetic analysis and judge on their genetic mechanism. It is recognized that the formation and evolution of basins, tectono-sedimentary cycles, sedimentary facies sequences and stratigraphic sequences, geological events are mainly controlled by the same episodic tectonic movement, so all of them are the geological records resulting from the same cause and expressed in different styles. There are close genetic connections and corresponding relationships among them and can be examed and complemented by each other, thus deepening relevant studies. New ideas about the following problems were proposed: the age of 'Tangshang Formation', the existence of 'Lishui Movement',the horizonal relationship between Yongkang Group and 'Tiantai Group', as well as a-mong the molassoid formations such as Fangyan Formation, Zhongdai Formation and 'Chichengshan Formation'. Eventually, a regional correlation scheme of Cretaceous strata in southeasthern China was suggested.