河南陕县黄连垛组的发现及其地质意义

前人将河南省陕县李村龙脖一带覆盖于熊耳群之上的碎屑岩-碳酸盐岩组合划分为高山河群和官道口群龙家园组。本次研究,通过剖面测制和区域对比,发现该套地层实际为长城系汝阳群云梦山组—洛峪口组、蓟县系黄连垛组及寒武系罗圈组、辛集组、朱砂洞组、馒头组。同时,在黄莲垛组中发现的假裸枝和卷心菜叠层石,可与官道口群龙家园组—巡检司组对比,证实了官道口群和黄连垛组是华北陆块南缘在蓟县纪形成的同一套碳酸盐岩沉积。

Discovery and geological implications of Huanglianduo Formation in Shanxian County,Henan Province

Previously，the stratigraphic unit of clastic and carbonate rocks overlying the Xiong'er Group had been divided into the Gaoshanhe Group and the Longjiayuan Formation of Guandaokou Group． Through the profiling and regional correlation，the authors found that the unit actually consists of the Yunmengshan- Luoyukou formations of Ｒuyang Group of Changcheng System，the Huanglianduo Formation of Jixian System，and the Luoquan- ，Xinji- ， Zhushadong- ， Mantou formations of Cambrian System． Meanwhile， Gymnosolen and Cabbage type stromatolites have been found in the Huanglianduo Formation，which can be compared with the stromatolites of Longjiayuan- Xunjiansi formations of Guandaokou Group． The fact confirms that the Guandaokou Group and Huanglianduo Group belong to the same set of carbonate sediments in the southern margin of the North China Craton formed in the Jixianian Pe- riod．