【摘要】 鄂尔多斯盆地南部中生界延长组长6—长8中发育与地震有关的震积岩,通过岩心观测识别出的震积岩标志主要有微同沉积断裂、震裂缝、液化砂岩脉、振动液化卷曲变形构造、地震角砾岩、负荷构造及枕状层等。同时在塔17井中发现完整的震积岩垂向序列,序列自下而上分为下伏未震层、微断裂层、微褶皱层、碎块层及液化均一层,上覆未震层。该震积岩的发现为盆地构造演化提供了动力学解释,表明晚三叠世随着秦岭、南祁连海槽的封闭,南北向逆冲带发生强烈活动,是本区延长组震积作用的直接诱发因素。同时该震积岩的发现,为盆地西南部延长组长6—长8发育的大规模浊积岩的外界触发机制是由地震活动引起的提供了有力证据。更多还原

【Abstract】 Many earthquake-related seismites were discovered in the Chang 6-Chang 8 of the Yanchang Formation, Upper Triassic, southern Ordos Basin. Having surveyed the cores of wells, many typical deformation structures were discovered, such as syn-sedimentary micro fractures, stone veins, vibration liquefaction, deformation structure, earthquake breccia and load-casts and balls-and pillows types, etc. The complete vertical sequence of seismite of Well Ta 17, which include shattered rock bed, ladder-shaped faulted bed, vibration liquefaction deformation structure bed, liquefied sandstone vein bed, rubble bed and homogenized bed. The discovery of seismite can be used to interpret the tectonic evolvement of the basin. In Late Triassic, with the closing of Qinling and the sea slot of Southern Qilian, the south-north thrust band appeared strong activity. It was the direct inducing factors of the seimo-deposition in Yanchang Formation.and provided the evidence for the turbidite of Chang 6-Chang 8 of the Yanchang Formation, southwestern Ordos Basin, and the outsider trigger mechanism of the turbidite is earthquake activity.更多还原