中文摘要：

豫西鲁山地区中、新元古代地层发育齐全，露头连续，是华北地台中元古界地层发育较好的地区之一。笔者借鉴miall研究河流岩相的l方法，结合岩石结构、沉积构造、MISS构造等特征，在鲁山地区中元古界汝阳群上部划分出了25种岩相，根据岩相类型、岩相组合、内部形态和剖面特征，识别出了6种沉积亚相及10种沉积微相，建立了7种沉积相序类型，得出了汝阳群上部的沉积环境由稳定滨岸碎屑沉积环境逐渐向碳酸盐岩沉积转变的演化规律。

英文摘要：

The Mesoproterozoic strata are widely and completely distributed in Lushan, Western Henan province, which is one of the best areas in Northern China Platform with well developed Mesoproterozoic strata. Based on Miall＇ s lithofacies classification on river deposits, with lithology and sedimentary structures and MISS, the Meso- proterozoic Upper Ruyang Group is divided into 25 lithofacies including 6 sedimentary facies and 10 sedimentary subfacies. Combined with the features of lithofacies and sedimentary facies, 7 kinds of despositional successions is recognized from Upper Ruyang Group. The main sedimentary evolution at Last Mesoproterozoic era in Lushan, Western Henan province is concluded from stable clastics rock environment to carbonate rock environment.