【摘要】 新疆奇台地区下石炭统地层中发现一套冲积扇进积到湖泊中而形成的扇三角洲沉积体。三角洲层序完整 ,清楚地显示出湖退又湖进的沉积序列 ;其中 ,扇三角洲平原部分主要以泥石流成因的块状砂砾岩为主 ,夹扇面河道沉积的含砾砂岩、中粗粒砂岩透镜体及中薄层状漫流沉积 ;扇三角洲前缘以碎屑流沉积的块状砂砾岩为主 ,夹水下分流河道沉积的砂岩透镜体。前三角洲以深灰色泥岩、粉砂质泥岩为主 ,沉积体中含丰富的植物化石。更多还原

【Abstract】 A type of fan-delta resulted from the progradation of an alluvial fan into a lake is found in Lower Carboniferous in Qitai Area, Xinjiang. Complete fan-delta sequence clearly shows the change of lake level . Debris flow sediments that are composed of massive sandstone and conglomerate are dominant in fan-delta plain, with lenticular pebbled or coarse sandstone deposited in stream channel in fan-delta plain and medium-flag sediments formed by unconcentrated flow. Sediments of fan-delta front are mainly composed of massive sandstone and conglomerate deposited by debris flow, containning lenticular sandstone deposited in subaqueous distributary channel. Sediments of prodelta are mainly consist of black-gray shale and siltshale. Abundant plant fossils are found in rock formation,更多还原