太行山地区寒武系崮山组的穿时性及沉积层序特征

Depositional sequences and diachroneity for the Cambrian Gushan Formation in the Taihang Mountains

崮山组是以页岩为主的岩石地层单位，在太行山地区表现了明显的穿时性。在井陉地区，崮山组仅限于崮山阶下部的Ｂｌａｃｋｗｅｌｄｅｒｉａ延限带，厚２～５ｍ；在曲阳地区，崮山组包括崮山阶及长山阶的中部，位于Ｂｌａｃｋｗｅｌｄｅｒｉａ与Ｃｈａｎｇｓｈａｎｉａ延限带之间；在涞源地区，它包括了崮山阶、长山阶及凤山阶中部，其界线位于Ｂｌａｃｋｗｅｌｄｅｒｉａ延限带与Ｔｓｉｎａｎｉａ－Ｐｔｙｃｈａｓｐｉｓ组合带之间。由此可见，崮山组是一个自北向南增厚、向上穿时的岩石地层单位。

The Gushan Formation is a lithostratigraphc unit dominated by shale. According to the new definition, it shows clear diachroneity in the Taihang Mountains. In the south part of Jingxing, the Gushan Formation, 2～5 m thick, is only equivalent to the Blackwelderia Range zone of the lower part of the Gushan Stage. In the Quyang area, it includes the Gushan Stage and the middle and lower parts of the Changshan Stage, placed between the Blackwelderia and Changshania Range zones. In the Laiyuan area it includes the Gushan Stage, the Changshan Stage and the middle part of the Fengshan Stage. It is equal to a biozone between the Blackwelderia Range zone and the Tsinania-Ptychaspis Assemblage zone. So, the Gushan Formation is a lithostratigraphic unit characterized by upward diachroneity and thickening from north to south.