准噶尔盆地不同期次石炭系断裂特征及分布

石炭系断裂十分发育，断裂样式有逆冲、背冲、对冲断裂类型，断裂平面分布具有明显的分区定向性，断裂主要沿NE—SW向、NWW—NEE向、NEE—SWW向、NW—SE向、近EW向5个方向展布。断裂发育时期特征明显， 各期构造运动对石炭系断裂发育及分布的影响程度有较大差别。现今石炭系断裂应是多期构造运动叠加的产物，在地震剖面上通过分析断裂及其相邻地层所具有的反射特征的差别，根据断裂上下地层的变形特征、厚度变化和断裂切割地层年代的差异来判别断裂发育的时期和持续的时段，将石炭系断裂按发育时期进行分离，再现各个主要构造运动期石炭系断裂的平面分布特征。盆地石炭系断裂按主要发育时期可分为海西期断裂、印支期断裂和燕山期—喜马拉雅期断裂。海西期断裂是石炭系发育的主要断裂，海西期发育的断裂多数在后期又继续活动，仅在海西期发育而后期不再活动的石炭系断裂主要分布在盆地腹部地区；印支期发育而后期不再活动的石炭系断裂主要分布在盆地东北缘地区；仅在燕山期—喜马拉雅期发育的石炭系断裂主要分布在盆地东部地区。

FEATURE AND DISTRIBUTION OF CARBONIFEROUS SURFACE FAULT IN DIFFERENT TECTONIC MOVEMENTS IN JUNGGAR BASIN

With many faults in Carboniferous，the styles of the faults are diversity，there are thrust fault，back fault and flushes fault.As a zonality of plane distribution，the faults spread in five directions，i.e.，northeast to southwest， northwest to west and northeast to east， northeast to east and northwest to west， northwest and northeast，and near east to west.The characteristics of the fault development period are very obvious，and the different tectonic movements effected differently on the fault development and on the fault distribution.The present faults in Carboniferous are as a result of many stacking tectonic movements.According to faults analysing in seismic profiles and reflection characteristics of neighbor strata，based on deformation characteristics between the above and under formations，changes in the thickness and difference of time faults cutting strata，the periods of fault development and fault duration are judged.So the faults in Carboniferous were separated by the the fault development period，and the plane distribution of faults in very key tectonic movement time is clear.The Carboniferous faults of Junggar basin are divided by its times into Hercynian fault，Indosinian fault and Yanshanian-Himalayan fault.The Hercynian fault is the foremost Carboniferous fault，and this kind fault continues to act in the last time.In general，the Carboniferous fault just growing in Hercynian mainly distributes in the hinterland of Junggar basin，in Indosinian mainly distributes in the northeast margin of Junggar basin and in Yanshanian-Himalayan mainly distributes in the east area of Junggar basin.