中文摘要：

准噶尔盆地西北缘五、八区二叠系佳木河组由火山岩、火山碎屑岩和碎屑岩组成，岩性复杂，彼此叠置。这种混积岩层的层序划分和沉积相分析具有较大的难度，同时，火山岩事件性和突发性的沉积特征也使碎屑岩沉积受到破坏。通过分析这种混积地层的形成条件、相控特征以及垂向发育，结合断裂系统发育特征、沉积相平面展布和岩性的突变接触，认为研究区的沉积体明显受控于构造沉降、物源供应强弱和火山喷发事件。在三大主控因素的作用和影响下，形成火山岩与碎屑岩混积的沟谷沉积体系，在等时格架内发育了水道式、水退式、水进式和中心式4种沉积充填模式，该模式对前陆盆地前渊带沉积发育演化及沉积充填具有指导意义。

英文摘要：

The Jiamuhe Formation developed in the Permian of Five-Eight area in the northwest margin of the Junggar Basin is composed of volcanic rock, volcaniclastic rock and clastic rock with complex lithology. The sequence division and sedimentary facies analysis of this kind of mixed formation is hard. Moreover, the event and sudden property of volcanic rock also make the clastic rock sediment destroyed. By analyzing the forming conditions, phase control features and vertical development of this kind of mixed layer, and considering the developed features of fractured system, plain through-going of sedimentary facies and abrupt contact of lithology, the sedimentary body of the study area is obviously controlled by tectonic descent, intensity of source supply and volcanic eruption event. The gully-valley sedimentary system of volcanic and clastic rock is formed with the effect of 3 major controlling factors. Four sedimentary packing patterns of waterway type, dereliction type, intaking type and centre type in the isochro-nic framework develop in the gully-valley sedimentary system. And this pattern is helpful for evolutionary lea tures of deposited development of foredeep and packing pattern in the foreland basin.