河套断陷带包头断裂第四纪活动性研究

发布时间：2018-05-28 05:29

本文选题：河套断陷带 + 传递斜坡　；参考：《地震地质》2016年04期

【摘要】：已有资料表明包头断裂呈NE走向隐伏展布于河套断陷带内次级盆地白彦花凹陷的东边界,目前关于该断裂的活动性资料尚需补充。鉴于包头断裂发育于由乌拉山山前断裂带和大青山山前断裂带组成的传递斜坡内部,研究其活动性不仅有助于深入讨论相邻活动断裂带的连接方式及活动响应,还可为更全面地认识河套断陷带的地震构造特征提供资料。控制性浅层地震勘探和钻孔联合剖面综合探测是当前研究隐伏断裂活动性非常有效的方法之一。跨包头断裂的浅层人工地震纵波反射剖面显示该断裂为倾向NW的正断层,深度约75m处的强反射层(Tg)位错量约为25m;在此基础上实施的联合钻探结果进一步揭示了该断裂具有明显的生长断层特征,其上断点止于地层顶部埋深45.6m的早更新世棕红色黏土层中,上覆上更新统与其为平行不整合接触。包头断裂属于早更新世断裂。
[Abstract]:It has been shown that Baotou fault is located in the eastern boundary of Baiyanhua sag in the secondary basin of Hetao fault depression with NE strike. The active data about the fault need to be supplemented at present. In view of the fact that Baotou fault developed inside the transfer slope composed of the front fault zone of Wulashan and the front fault zone of Daqingshan, the study of its activity is not only helpful to discuss the connection mode and active response of adjacent active fault zone in depth, It can also provide data for a more comprehensive understanding of the seismic structural characteristics of the Hetao fault depression zone. Controlled shallow seismic exploration and integrated exploration of combined borehole section are one of the most effective methods to study the activity of concealed faults. The longitudinal wave reflection profile of shallow artificial earthquakes across the Baotou fault shows that the fault is a normal fault inclined to NW. The dislocations of strong reflection layer Tg at a depth of about 75 m are about 25 m.The results of joint drilling on this basis further reveal that the fault has obvious characteristics of growing faults. Its upper fault point ends in the early Pleistocene brown red clay layer with a depth of 45.6 m at the top of the strata, and the upper Pleistocene is in parallel unconformity with it. Baotou fault belongs to early Pleistocene fault.
【作者单位】：河南省地震局;
【基金】：中国地震局“中国城市活动断层探测与地震危险性评价”项目资助
【分类号】：P315.2

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