中文摘要：

华北克拉通南缘中元古界的沉积学、地层学及大地构造演化等研究一直是前寒武纪地质研究的热，最问题。选取豫西济源地区中元古界兵马沟组典型剖面，在野外踏勘和剖面实测基础上，运用镜下薄片观察和粒度参数分析等方法对兵马沟组沉积特征进行了分析，并进行了沉积环境恢复。研究结果表明，济源兵马沟组岩性以紫红色砾岩为主，其次为含砾粗砂岩、粗砂岩等，从下往上砾石粒径逐渐减小，磨圆变好；砂岩的粒度参数特征及概率累计曲线特征表明兵马沟组为重力流沉积，概率累计曲线的变化说明其沉积时水动力条件整体上逐渐减弱。综合各方面特征分析，兵马沟组沉积时期水体动荡，有多期洪流出现，为间歇性的灾变洪流；沉积环境为冲积扇-扇三角洲沉积相，从中可识别出泥石流沉积微相、碎屑流沉积微相、分流河道沉积微相及漫流沉积微相，其中以泥石流和碎屑流沉积为主。该研究对华北克拉通南缘中元古界地层沉积环境演化研究具有重要意义。

英文摘要：

Sedimentology, stratigraphy and tectonic evolution of southern North China Craton in Mesoprot- erozoic have been hot issues in research. Based on the field reconnaissance and profile measurement, the sedimentary characteristics of the Mesoproterozoic Bingmagou Formation in Jiyuan, western Henan Prov- ince are studied, by slice observation and grain size analysis methods to restore the sedimentary environ- ment. The results suggest that the purplish conglomerates are the main rocks with the particle size decrea- sing from bottom to top, with the psephicity becoming better. The rest parts are pebbly sandstones and gritstones. The granulometric parameters and cumulative curve of sandstones indicate Bingmagou Forma- tion consists of gravity flow deposits, and the trend of cumulative curve also illustrates decreasing hydro- dynamic conditions. Comprehensive analysis of all aspects, the turbulence of the current and appearance of intermittent catastrophic flood are the main sedimentary characteristics during the peroid of Bingmagou Formation. The sedimentary environment is alluvial fan-fan delta, in which the debris flow, distributary channel and sheet flood microfacies can be identified. The results has an important implications for the stusy of the Mesoproterozoic sedimentary environment evolution in the southern margin of the North China Craton.