摘要
陆源碎屑岩和碳酸盐岩的混合沉积是陆表海重要的沉积现象,反映了其沉积特征。鄂尔多斯东北部大牛地气田本溪组和太原组是典型的陆表海碎屑岩—碳酸盐岩混积层系。结合区域地质研究,建立了陆表海碎屑岩—碳酸盐岩混积层系的沉积相模式。根据华北晚古生代聚煤盆地的地质背景和沉积演化过程,认为大牛地气田本溪组、太原组是陆表海碎屑滨岸—碳酸盐岩台地混积体系和海岸平原沉积体系:本溪组下段为碎屑滨岸相局限浅海亚相,上段为碳酸盐岩台地相和碎屑滨岸相;太原组下段为三角洲相和碎屑滨岸相→碎屑滨岸相;中段为盆控型泥炭沼泽相→碳酸盐岩台地相和碎屑滨岸相;上段为三角洲相和碎屑滨岸相→碳酸盐岩台地相和碎屑滨岸相→三角洲相和碎屑滨岸相→碳酸盐岩台地相和碎屑滨岸相。
The mixed clastic-carbonate sediment is the important sediment phenomenon which can re- act characteristic deposits of the epicontinental sea. The Benxi and Taiyuan Formations in the Daniudi Gas- field located in the northeast of Ordos are typical series of the mixed elastic-carbonate sediments deposited in the epicontinental sea. According to these features on lithologic assemblage with the study on regional geolo- gy, the pattern has been first created on sedimentary facies of the mixed elastic-carbonate sediments in the epicontinental sea in this paper. Sedimentary environment of Benxi and Taiyuan Formations is numerously considered as barrier elastic coastal environment. Based on geologic setting and sedimentary evolutionary process of the coal bearing basin in North China during the Late Paleozoie, the Benxi and Taiyuan Formations in Daniudi Gasfeild belong to epicontinental sea elastic coastal-carbonate platform mixed depositional system and coastal plain depositional system in this paper. The lower member of the Benxi Formation of Up- per Carboniferous belongs to restricted clastic coastal facies and upper member belongs to carbonate platform and elastic coastal facies. The Lower member of the Taiyuan Formation of Upper Carboniferous-Lower Permi- an belongs to delta facies and clastic coastal facies→clastie coastal facies, the middle member belongs to basin-controlled peat marsh facies→carbonate platform facies and elastic coastal facies, the upper member belongs to delta facies and elastic coastal facies→carbonate platform facies and elastic coastal facies→delta facies and elastic coastal facies→carbonate platform facies and elastic coastal facies.
出处
《古地理学报》
CAS
CSCD
北大核心
2009年第6期611-627,共17页
Journal of Palaeogeography：Chinese Edition
关键词
鄂尔多斯
大牛地气田
陆表海
碎屑岩-碳酸盐岩台地混积
盆控型泥炭沼泽
Ordos, Daniudi Gasfield, epicontinental sea, mixed elastic-carbonate sediments strata system, basin-controlled peat marsh
