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在甘肃省酒西盆地青南凹陷柳沟庄—窟窿山地区下白垩统下沟组及中沟组地层序列中,首次发现发育一套地震事件沉积物,是一套含微裂缝或同生变形构造及振动液化泄水构造等震积特征的泥质白云岩、白云质泥岩及泥质粉砂岩的组合。本区震积作用及震积岩的主要识别标志为振动液化卷曲变形及其伴生构造、重荷模及伴生构造、脆性和塑性两类沉积物相间的滑塌变形作用及滑塌岩、软沉积物的液化作用及泄水构造、层内阶梯状断层及地裂缝。柳沟庄—窟窿山地区下白垩统震积岩的发现,填补了本区震积岩研究的空白,反映了本区在早白垩世存在一个强烈的构造活动时期,可以推测其影响范围可能还会波及青南凹陷的其他地区,也有望在酒西盆地类似环境的其他凹陷发现震积岩,开辟震积岩研究的新领域。区域构造背景的研究同样表明,青南凹陷青西Ⅰ号同生断裂带及509断阶带的强烈构造活动正是本区早白垩世震积作用的直接诱发因素,为本区震积岩的存在提供了科学依据。
In the sequence of the Lower Cretaceous Xiagou Formation and Zhonggou Formation in the Liugouzhuang-Kulongshan area, Qingnan Sag, Jiuxian Basin, Gansu Province, it is the first time that a set of seismic event sediments have been developed, which is a set of sedimentary facies with microfracture or symbiotic deformation And shale dolomite, dolomitic mudstone and argillaceous siltstone, which are characterized by the seismogenic features of vibrating liquefaction and drainage structures. The seismogenic functions and seismite accretions in this area are the slip liquefaction of the vibrating liquefaction crimp deformation and its associated structure, the heavy load mode and its associated structure, the brittleness and plasticity, and the slump rock, soft sediment Liquefaction and drainage structure, step-like fault layer and ground fissures. The discovery of the Lower Cretaceous seismites in the Liugouzhuang-Kulongshan area has filled the gap in the study of the seismites in this area, reflecting the existence of a period of intense tectonic activity during the Early Cretaceous in this area. It can be speculated that its scope of influence may also It will affect other parts of the Qingnan depression. It is also expected to find seismites in other sags in similar environments in the Jiuxi basin and to open up new areas for the study of seismites. The study of regional tectonic setting also shows that the intense tectonic activity of the Tongxi fault zone Ⅰ and the 509 fault zone in the Qingnan sag is the direct triggering factor of the Early Cretaceous seismogenic function in this area, Provide a scientific basis.