豫西震旦系露头序地层学初步研究及其意义

PRELIMINARY RESEARCH OF THE OUTCROP SEQUENCE STRATIGRAPHY IN SINIAN AND ITS SIGNIFICANCE IN WESTERN HENAN PROVINCE,CHINA

运用露头层序地层学的方法，对豫西鲁山下汤和临汝罗圈震旦系剖面进行了研究，并结合区域上该地层的发育特征，初步识别出３个Ⅰ类层序．前两个层序分别与岩石地层单位黄连垛组和董家组相当，属于缓坡沉积相模式（ｒａｍｐｄｅｐｏｓｉｔｅｄｍｏｄｅｌ）；第三层序由罗圈组和东坡组组成，沉积于具陆架坡折（ｓｈｅｌｆｂｒｅａｋ）的盆地中．

The method of the outcrop sequence stratigraphy is applied to the research of the Sinian sections located in Xiatang,Lushan and Luoquan,Linru in western Henan Province. Based on the analyses,three type Ⅰ depositional sequences have been primarily identified. The first two depositional sequences, respectively consisting of the Huanglianduo Formation and the Dongjia Formation,belong to the ramp depositional model. The third one is deposited in the basin with shelf break,composed of the Luoquan Formation and the Dongpo Formation. The Sinian sequences between south China and western Henan Province can be basically correlated.