浙江金衢盆地白垩系衢江群沉积相类型及沉积环境演化

本文在野外露头观察和前人研究成果整理的基础上,通过对金衢盆地白垩系衢江群的岩性组合、沉积构造、地层序列及沉积中心、岩相变化等的研究,将衢江群划分出山麓洪积相、河流相、湖泊相、河湖相4种沉积相类型.认为盆地发育大致经历了3个阶段:形成于中戴期早期,于金华期处于全盛时期,萎缩于衢县期.衢江群岩性总体上反映了盆地的发生、扩展至萎缩各个时期的变化.

Sedimentary facies and environments of the Cretaceous Qujiang Group in the Jinhua-Quzhou Basin, Zhejiang

Four types of sedimentary facies have been distinguished for the Cretaceous Qujiang Group on the basis of lithologic associations, sedimentary structures, stratigraphic sequences, depocenter and sedimentary facies changes, including the pediment pluvial facies, fluvial facies, lacustrine facies and fluviolacustrine facies. The Jinhua-Quzhou Basin has undergone three stages of formation and evolution, including the initial stage during the early Zhongdaian, culmination during the Jinhuan, and termination during the Quxianian, as revealed by the general lithology of the Qujiang Group.