中文摘要：

通过对济源盆地中侏罗统马凹组露头剖面的详细实测和野外资料的室内整理分析,运用沉积学和地层学方法,进行了马凹组沉积相划分和沉积环境演化研究,并探讨了其控制因素.结果表明,该剖面马凹组下段主要发育河流相,上段主要发育湖泊相,其中河流相识别出河床、堤岸和河漫滩3种亚相,湖泊相主要发育湖泊三角洲、滨湖和浅湖3种亚相.马凹组下段沉积时期由于北秦岭发生逆冲推覆活动,黛眉寨背斜隆升,大量粗碎屑进入济源盆地,形成了厚层的河流相砂岩沉积;之后其活动性减弱,由于气候周期性变化,经历了2个浅湖-滨湖的沉积旋回,形成了多个细砂岩-泥岩-泥灰岩的沉积韵律.马凹组下段沉积主控因素为构造运动;上段沉积受气候的周期性变化和构造运动共同作用影响.

英文摘要：

According to the field investigation and measurement of Middle Jurassic Maao Formation in Jiyuan basin and the indoor analysis of the field data,the recognition of sedimentary facies and the analysis of sedimentary environment evolution of the Maao Formation are performed mainly with the methods of sedimentary petrology and stratigraphy.Conclusions comes out that the lower member of the Maao Formation mainly develops with fluvial facies and the upper member mainly with lacustrine facies.Three kinds of subfacies of fluvial facies are recognized,called riverbed,embankment and flood-plain subfacies;Lacustrine facies mainly include three kinds of subfacies,lake delta,shallow lake and lakeshore.In the early sedimentary period of Maao Formation,the movement of Northern Qinling Thrust-nappe Belt results in thick fluvial facies sandstones;later the fault movement rate is small,and the periodic change of climate leads to two sedimentary cycles of shallow lake-lakeshore and several sedimentary rhythms of fine sandstone-mudstone-marl.Tectonic movement mainly affects the lower member of the Maao formation deposition;the periodic change of climate and tectonic movement affect the upper section together.