中文摘要：

神山沟剖面位于鄂尔多斯盆地东北缘内蒙古东胜地区,侏罗纪延安组、直罗组富含孢粉化石。延安组为煤系沉积地层,岩性以灰白色砂岩、灰色粉砂岩夹泥岩为主,局部发育砾岩,可见5、6套煤层;直罗组为重要的含铀岩系,岩性以灰色-黄绿色砂岩、灰色粉砂岩夹紫红色泥岩、泥质粉沙岩为主。文中通过对神山沟剖面延安组和直罗组孢粉化石的分析,在延安组中识别出Cyathidites-Dictyophyllidites-Cycadopites（CDC）和Cyathidites-Osmundacidites-Lycopodiumsporites-Concentrisporites-Disacciatrileti（COLCD）2个孢粉组合带,通过对孢粉化石属种的分析,得出本剖面延安组孢粉组合的时代为早中侏罗世早期;直罗组孢粉组合为Cyathidites-Osmundacidites-Cycadopites-Disacciatrileti（COCD）组合带,时代中侏罗世中期。结合地质、元素地球化学、古植物及其孢粉化石的定量分析表明,从延安组向直罗组其总体上反映了从温暖潮湿的亚热带向半干旱-干旱炎热的气候转变,反映燕山运动早期中侏罗世一次重要的古气候变化事件,古气候对煤、砂岩型铀的成矿具有特殊的地质意义。

英文摘要：

Shenshangou section is located in the northeastern Ordos Basin,Dongsheng area of Inner Mongolia.Jurassic Yan＇an Formation and Zhiluo Formation contain abundant sporopollen fossils.The Yan＇an Formation is a coal-bearing strata,and is composed of grayish white sandstone,grey siltstone with mudstone,few conglomerate layer,and 5-6sets of coal seam.The Zhiluo Formation is an important uranium bearing rock series.It consists of gray greenish sandstone,grey siltstone with purple red mudstone and mud silty rocks.On the basis of the profile of ShenshangouYan＇an Formation and Zhiluo Formation sporopollen analysis,we identifiedtwo assemblage zone of Cyathidites-Dictyophyllidites-Cycadopites（CDC）and Cyathidites-OsmundaciditesLycopodiumsporites-Concentrisporites-Disacciatrileti（COLCD）in the Yan＇an Formation,which indicate that the age of Yan＇an Formation was the Early to Middle Jurassic.Sporopollen assemblage zone of the Zhiluo Formation is composed of Cyathidites-Osmundacidites-Cycadopites-Disacciatrileti（COCD）with the Middle Jurassic era.Comprehensive geology,element geochemistry,and the quantitative analysis of fossil plants and sporo-pollen fossils showed that from the Yan＇an Formation to the Zhiluo Formation deposition period the climate changed from the subtropical warm and humid to arid and semi-arid hot,reflecting an important ancient climate change event in the early Yan＇an movement during the Early Jurassic,which may have special geological significance for the coal and sandstone type of uranium mineralization.