准噶尔盆地西北缘布龙果尔凹陷构造变形特征解析

Research on the deformation characteristics of Bulonggoer Sag in northwest of Junggar Basin

布龙果尔地区位于谢米斯台与沙尔布尔提褶皱造山带的交汇部位,该区构造复杂,至今仍属于研究的空白区域。此次在1:200000和1:50000地质图及地质报告的基础上,结合野外实地构造考察,对区内的构造发育特征进行了详细的分析研究。强烈的构造运动导致区内不整合发育,根据这些不整合,可以将研究区中泥盆统一第三系地层划分为6个主要构造层。布龙果尔地区断裂非常发育,其中压扭性断层最为发育并具有规模大,与区域地层走向、褶皱轴线平行展布的特点;扭性断层亦很发育,与压扭性断层配套出现;张性断裂区内不发育,仅在局部可见。区内的褶皱主要是在海西、燕山及喜马拉雅山构造运动时期形成,不同构造时期形成的褶皱在规模、延伸方向及其与断裂的关系方面均具有不同的特征。研究表明,布龙果尔地区构造演化过程具有明显的阶段性,其中海西、燕山及喜马拉雅山期构造运动是区内3个最主要的构造演化阶段。

Bulongguoer area located in the convergence region of Ximisitai and Shaerbuerti orogen has been not researched by anyone because the complexity of it＇s structure. Based on geologic maps and reports and field comprehensive survey, the structural feature of Bulongguoer is analysed detaily. Lots unconformity generates because the intensive tectonic movement. According to these unconformity,the Middle Devonian to Neogene formation of Bulongguoer can be divided into six stockwerkes. Faults are very developed in research area. The most developed Compresso-shear faults are large in scale and parallel to the regional stratigraphy aligement and folds axial trend. Shear faults are also very developed assorted with compresso-shear faults. However, extension faults only can be founded in few region. The folds of the Bulongguoer mainly format during Hercynian,Yenshan and Himalayan movement epoch and the folds format in different movement epoch has different character in scale, bearing of trend and the relationship with faults. The results show that NE tectonic belts are the dominant structural pattern which control the the major regional structural form, sedimentary, magmatic activity and mineralization.