江西贵溪盆地罗塘群沉积相特征

早白垩世晚期江西贵溪盆地的控盆断裂活动加强,在盆地边缘的不同地带及盆地中心发育有不同的沉积相。野外露头岩性相特征和剖面的研究表明,贵溪盆地罗塘群主要发育有冲积扇相、扇三角洲相、辫状河三角洲相、辫状河相及湖泊相,不同的沉积相出现在盆地演化的不同阶段,并由不同的岩性相组成。沉积相的特征、分布及组合形式反映了陆相断陷红盆沉积地层相带窄、横向及纵向上相变快的特点。

Features of sedimentary facies,Luotang Group in Guixi Basin,Jiangxi

In the late period of Early Cretaceous,the fault activities that dominated the formation of Guixi Basin became more extensive,different sedimentary facies were developed in the different edges of the basin edges and center.The study of lithofacial characteristics of the outcrops and profiles show that alluvial fan facies,fan-delta facies,braided stream delta facies,braided stream facies and lacustrine sedimentary facies were mainly developed in Luotang Group,Guixi Basin,and in different evolutionary stages of the basin,different sedimentary facies were developed with a composition of different lithofacies.The features,distribution and combination of the sedimentary facies demonstrated a narrow distribution,abrupt changes in facies in lateral and longitudinal directions for some continental faulted red sedimentary basins.