鄂尔多斯西缘前陆盆地上古生界沉积相特征研究  

SEDIMENTARYFACIES ON THE UPPER PALEOZOIC OFTHE ORELAND BASIN OF THE WESTERN MARGIN OF THE ORDOS, INJIANG

作　　者：赵培坤[1] 纪友亮[1] 

机构地区：[1]同济大学海洋与地球科学学院,上海200092

出　　处：《新疆地质》2005年第2期152-157,i006,共7页Xinjiang Geology

基　　金：国家十五科技攻关项日(2004BA616A0402A)同济大学行动计划项目(1350114006)资助

摘　　要：在层序地层学研究的基础上,对鄂尔多斯盆地西缘逆冲构造带上古生界进行了详细的沉积相研究,分析出该地发育了6种沉积相,分别为碳酸盐潮坪相、障壁砂坝-泻湖相、河口湾相、三角洲相、河流相、湖泊相.并按上古生界识别出的2个二级层序,推测出沉积相的平面展布特征,总结出鄂尔多斯盆地西缘地区,晚古生代沉积演化经历了拗拉槽再活动背景下的裂谷海湾充填、陆表海充填和内陆坳陷充填3个发展阶段.并结合构造、物源供给、海侵、古气候等条件分析了鄂尔多斯西缘前陆盆地上古生界沉积相演化的控制因素.Analysis of sedimentary facies was carried out on the Paleozoic along the overthrusting structure zone of the western margin of the Ordos. Six sedimentary facies had developed in the area.: carbonate tidal-flat sedimentary facies, sand barrier-lagoon facies, estuarine facies, fluvial facies, lake facies and delta facies. According to the five second-order sequences identified in the Upper Paleozoic, the distribution of these sedimentary facies has been a subject of great speculation. This paper summarizes the sedimentary evolution of the basin. It developed in three stages: filling of rift. , filling of epiric sea and filling of continental downwarping due to the reactivation of the aulacogen. The controlling factors of sedimentary facies evolution in this area have been analyzed in relation to structure, source supply, marine transgression, and paleoclimate.

关 键 词：上古生界 前陆盆地 沉积相 西缘 特征研究 鄂尔多斯盆地 平面展布特征 层序地层学 三角洲相 沉积演化 晚古生代 物源供给 控制因素 条件分析 构造带 碳酸盐 泻湖相 河口湾 河流相 湖泊相 充填 拗拉槽 陆表海 相演化 古气候 

分 类 号：P534.4[天文地球—古生物学与地层学] P512.2[天文地球—地质学]