准噶尔晚石炭世—二叠纪前陆盆地的演化

EVOLUTION OF JUNGGAR LATE CARBONIFEROUS-PERMIAN FORELAND BASIN

对准噶尔盆地露头区以及钻井、物探资料进行了分析 ,同时对全盆地二叠系进行了地层划分和对比。结合对准噶尔盆地周缘大地构造环境及基底特征的分析结果 ,将准噶尔晚石炭世—二叠纪盆地定义为前陆盆地 ,其中发育 3个前陆盆地系统 :①西缘前陆盆地系统 ,该系统早期为近南北向延伸 ,从玛湖一直延伸到古车排子山前 ,后期分成南北两部分 ,北部称为西北缘前陆盆地 ,而南部被北天山前陆盆地系统所叠加 ;②克拉美丽前陆盆地系统 ;③北天山前陆盆地系统。各盆地系统的范围、发育时间和程度不同 ,前两个前陆盆地系统发育时间稍早 ,而后者盆地范围较前两者大。盆地中的所有构造特征都是这三大前陆盆地系统各构造组成要素叠加复合的结果。

The delimitation and correlation of Permian group in Junggar basin are analyzed in terms of the outcrops, drilling and geophysical data. Combining with the geological analyses of the tectonic setting and basin-filling, the Permian sequences of the basin are divided and compared. The Junggar basin in the Late Carboniferous and Permian underwent foreland basin developing processes with three foreland basin systems, including the West Foreland Basin, the Kelameili Forland Basin and the Northern Tianshan. They are different in the distribution range, developed level and developing time. All of the structures in the basin are resulted from the piling-up and compounding of the three systems.