The thick redbed of the upper cretaceous Hekou Formation is widely distributed over the southwest of Nancheng,Jiangxi Province,forming Danxia hilly landforms. The Danxia hilly landscapes have shaped into islands surrounded by green lake water,forming a unique scene of"green water around red cliff"which is the main tourism attraction of the Zuixian Lake Scenic Area. According to types of geological driving forces,the Danxia landforms developed in the Zuixian Lake were assorted into various types,such as Danxia tectonic landform, Danxia water erosion landform,Danxia wind erosion landform,and Danxia salt weathered landform. Through field investigations and indoor analysis,the deposition feature of the braided river facies of the cretaceous redbed in the study area was systematically analyzed. From the geological point of view,the sedimentary characteristics,internal and external dynamic geologic actions of the cretaceous redbed were expounded in detail respectively. Results suggested that the lithofacies in the area lay the material foundation for the formation of the Danxia landscape,and its sedimentary types,internal and external geologic dynamics play an important role in constraining the landscape development.%江西南城东南部地区广泛发育上白垩统河口组巨厚红层,丹霞丘陵地貌被翠绿的湖水分割为众多岛屿,形成了"绿水绕红山"的独特景象,是醉仙湖景区的主要地貌景观.关于丹霞地貌景观的成因机制,不同区域往往主控因素也不一致.为了增强地质公园建设过程中的科普价值,就需要对红层成岩-成景过程中的地质作用有着详细的了解.本文按控制红盆成景的主导动力因素,将研究区醉仙湖内发育的丹霞地貌详细划分为丹霞构造地貌、丹霞水蚀地貌、丹霞风蚀地貌、丹霞盐风化地貌等多种类型.通过对研究区红层的岩石学特征、沉积相带划分以及景观地貌特征等因素的分析,笔者认为研究区成景地层主要为一套白垩系红层辫状河相砂砾岩,为丹霞地貌的形成奠定了物质基础,成岩期后的内外动力作用对景观成因有着重要的约束作用.
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