【摘要】 通过野外系统地质调查和实测地质剖面研究,在海拉尔盆地内部及其周边地区识别出盆地基底大型伸展变形带、盆地伸展构造和盆地挤压构造3类构造样式。其中:盆地基底大型伸展变形带包括额尔古纳韧性剪切带和嵯岗构造片麻岩带;盆地伸展构造样式以海拉尔市北部日军要塞堑垒、断阶构造、追踪张性断层和灵泉露天煤矿大型正断层为代表;盆地挤压构造样式以头站旅店逆冲断层、灵泉露天煤矿断褶带、伊敏露天煤矿顶厚褶皱和大型同沉积褶皱为代表。在构造样式形成时代研究的基础上,结合前人地震剖面解释成果,认为海拉尔盆地由老至新至少经历了6期重要的构造变形事件,即晚侏罗世—早白垩世早期盆地基底大规模伸展、下白垩统铜钵庙组沉积期强烈断陷、下白垩统南屯组沉积后挤压反转、大磨拐河组二段—伊敏组沉积期伸展拗陷、伊敏组沉积之后至上白垩统青元岗组沉积之前强烈挤压、青元岗组沉积期同沉积挤压。6期变形事件由老至新组成了海拉尔盆地较为完整的变形序列。更多还原

【Abstract】 Three kinds of structural styles,including large extensional deformation zones at the basement of Hailaer basin,basin extensional structure and basin compressive structure,are identified in the outcrop area of Hailaer basin and around its margin through systematic field geological survey and the synthetic study of the measured geological sections.The large extensional deformation zones at the basement of Hailaer basin include Eerguna ductile shear zone and Cuogang tectonic gneiss zone.The basin extensional structures include the horst and graben,fault terrace structures and trace tension faults to the north of Hailaer and the large normal faults in Lingquan open coal mine.The basin compressive structures include the thrust faults in Touzhan hotel,the faulted and fold zones in Lingquan open coal mine and the top thick and large syn-depositional folds in the Yimin open coal mine.Based on the study on the Formation time of various structural styles and the geological interpretation of seismic profiles of Halaer basin,it is thought that Halaer basin has undergone the following six periods of important deformation events,namely,large-scale extension activity at the basement of Hailaer basin in the Late Jurassic-early period of Early Cretaceous;the strong fault depression in the sedimentary period of Tongbomiao Formation of the Early Cretaceous,the compressive tectonic inversion after the sedimentation of Nantun Formation in the Early Cretaceous,the extension depression in the sedimentary period of Yimin Formation,the strong compressive function after the sedimentation of Yimin Formation in the Early Cretaceous and before the sedimentation of Qingyuangang Formation of the Upper Cretaceous and the syn-depositional compression during the deposition period of Qingyuangang Formation.Above six major deformational events make up formed a relatively complete tectonic deformation sequence of Halaer basin.更多还原