摘要
周口坳陷早白垩世主要发育冲积扇相、河流相、湖泊相、扇三角洲相和三角洲相等类型，其中谭庄－沈丘凹陷沉积相带呈东西向狭长展布，是一个典型的断陷盆地．本文在讨论了湖盆的物源、古地形、古水流、水介质条件及古气候条件的基础上，提出了早白垩世时周口坳陷的沉积格局。
The sedimentary facies types of alluvial fans,fluvial deposits,fan deltas and normal deltaic deposits prevail in the Lower Cretaceous strata in the Zhoukou depression in which the Tanzhuang—Shenqiu facies zone appears in a EW-oriented narrow form.The sedimen- tary framework of the Zhoukou depression during Early Cretaceous time has been ascer-tained on the basis of the study of provenances,palaeotopography,palaeocurrent,water media and palaeoclimates.
关键词
早白垩世
沉积相
沉积格局
周口坳陷
地层
Tanzhuang-Shenqiu depression
Early Cretaeeous
sedimentary facies
sedimentary framework
