【摘要】 滇西泥盆纪时存在一南北向深海槽,长达700km 以上,其中发育陆源碎屑海底扇及与之相关的深水沉积,构成海底扇模式与碳酸盐斜坡楔状体模式的组合实例。海底扇居于高效能与低效能类型之间,更偏于高效能体系,物质来源与深切斜坡的海底峡谷有关。坡脚碳酸盐沉积自成体系,不受扇体控制,沿碳酸盐斜坡分布,由异地碳酸盐重力沉积与深水原地沉积组成,物质来自邻近的碳酸盐台地。重力沉积,特别是海底扇沉积,阶段性甚明显,可划分出萌动期(江(?)阿冷初期,即早泥盆世早期);全盛期(班满到地期,即早泥盆世晚期);收缩期(中泥盆世)。更多还原

【Abstract】 A deep trough which was more than 700 km long stretched from north tosouth in west Yunnan in the Devonian.Submarine fan of terrigenous debrisand the related deep water sediments were well developed there,thus formed theassemblage of both submarine fan model and carbonat slope wedge model.The fan is between high energy system and low energy system,but moreclose to high energy system.It can be divided into five subfacies such asinnerfan facies,central-fan facies,outer-fan facies,fan marginal facies andbasin-plain facies.The carbonate sediments on base of the slope along the dis-tribution of carbonate slope,as a self-formed system,are not controlled by thefan body.It consist of allochthonous sediments in carbonate gravity flow andautochthonous sediments in deep water.The provenance of the former is relat-ed to the submarine canyon which deeply cuts the slope,and that of the fateris the adjacent carbonate platform.Gravity sediment,especially the submarine fan show up distinct phases.Itcan be divided into embryonic stage(Shanjiang-Alengchu period,i.e.,the earlystage of the Early Devonian),prime stage(Banmandaodi period,i.e.,the latestage of the Early Devonian)and depauperation stage(the Middle Devonian).They constitute the evolution history of deep water sediments.更多还原