摘要
准噶尔盆地西北缘二叠系是由正常碎屑岩-火山碎屑岩-火山岩构成的复合地层系统。正常碎屑岩主要分布于中、上二叠统，沉积相主要为冲积扇和扇三角洲相，其中扇三角洲相发育由断裂控制的伴随有火山作用相的断崖扇三角洲相和无火山作用相的断裂控制的断崖扇三角洲相以及无断裂控制的缓坡型扇三角洲相3种模式。火山岩和火山碎屑岩主要分布于下二叠统，其产出方式也可分为断隙型、上牵引型和叠锥型火山口3种类型。通过沉积岩相研究，将二叠系划分为6个三级火山-沉积层序，详细阐述了火山口及扇三角洲相（冲积扇）的时空展布与盆地沉积充填和构造演化的耦合关系。
The Permian in Junggar basin is composed of normal clastics, volcanic clastics and volcanics. The sedimentary lithofacies of normal clastics, being mainly present in Middle and Upper Permian,is alluvial fan and fan-delta. There are three kinds of fan-delta in the study area as follows: ① faulting related steep fan-delta accompanied with volcanic facies; ② faulting related steep fan-delta without volcanic facies; ③ gently slope fan-delta unrelated to faulting. Volcanics and volcanic clastics being mainly present in the Lower Permian occur in three forms. By studying sedimentary Lithofacies, the Permian is divided into six third-order volcanic-sedimentary sequences. Finally, the paper presented the coupling relationship between the time and space distribution of alluvial fan or fan-delta and sedimentary-filling and tectonic evolution for volcanic-sedimentary basin.
出处
《新疆石油地质》
CAS
CSCD
1999年第5期397-401,共5页
Xinjiang Petroleum Geology
关键词
准噶尔盆地
二叠纪
盆地化
沉积岩
沉积岩相
Junggar basin Permian Basin Evolution Volcanic rock Sedimentary rock Sequence Sedimentary rock facies
