准噶尔盆地南缘霍玛吐构造带晚新生代构造变形特征及时间

Structural deformation and time of late Cenozoic of Huo-Ma-Tu structural belt in South Junggar Basin,Northwest China

通过地震剖面精细地质解释,对准南缘霍马吐构造带的构造变形特征进行了系统分析.认为霍马吐构造带纵向上分三层,第一层为沿着古近系安集海河组底部泥岩层滑脱的单斜带,第二、三层在霍尔果斯为一断层转折-复合楔状叠加褶皱,在玛纳斯为一断层转折-断层传播叠加褶皱,在吐谷鲁则为一断层传播-断层传播叠加褶皱,滑脱层分别为下白垩统和中、下侏罗统的煤系或泥岩.构造变形开始于塔西河组(N1t)沉积期,定型于西域组(Q1x)沉积期及之后,并大体具有"西早东晚"、"上早下晚"的构造变形特征.

Based on the ：seismic profile interpretation, the structural deformation features of Huo-Ma-Tu structural belt in southern Junggar basin, northwest China is presented. Huo-Ma-Tu structural belt in section is composed of three layers of structures. The upper is a monoelie detached along to the bottom of Anjihaihe Formation of Paleogene; the middle and lower is a hybrid fault-bend/wedgement fold in Huorguosi, hybrid fault-bend/fault-propagation fold in Malasi, and hybrid fault-propagation/fault-propagation fold in Tugulu respectively. And the detachment layer is the mudstone of Lower Cretaceous in the middle, and coal and mudstone of Middle and Lower Jurassic in the lower. The structural deformation started in the sedimentary period of Taxihe Formation （NIt）, and formed in and after the sedimentary period of Xiyu Formation （Q1 x）, and exhibits the features of earlier in the west and upper than in the east and lower.