北京凹陷北缘第四纪凹陷盆地沉积速率变化特征与顺义断裂活动性的响应关系

发布时间：2018-03-29 00:32

本文选题：北京凹陷　切入点：磁性地层　出处：《中国地质》2016年02期

【摘要】：北京凹陷受黄庄—高丽营断裂与南苑—通县断裂共同控制,形成于古近—新近纪。凹陷北缘在第四纪由于顺义断裂的强烈活动解体,形成2个新的凹陷,后沙峪凹陷和俸伯凹陷。文章在后沙峪凹陷内开展了钻孔ZK19的第四纪磁性地层研究,结合光释光测年结果获得钻孔ZK19早更新世、中更新世、晚更新世和全新世地层底板埋深分别为434 m、128 m、29.9 m和1.35 m。通过与俸伯凹陷内钻孔ZK12-2进行沉积地层厚度与沉积速率的对比分析,探讨了顺义断裂第四纪以来的活动特点,从而对北京凹陷北缘盆地演化进行了探讨。研究表明,顺义断裂在第四纪早更新世的强烈活动最终造成了北京凹陷北缘盆地的解体;中更新世,顺义断裂相对于黄庄—高丽营断裂活动性不甚明;晚更新世,顺义断裂相对于黄庄—高丽营断裂再次强烈活动,加速了北京凹陷北缘盆地的分化;全新世,顺义断裂强烈活动并造成了地表地裂缝的发育和建筑物的破坏。
[Abstract]:The Beijing sag is controlled by the Huangzhuang-Gaoliying fault and the Nanyuan-Tongxian fault and formed in the Paleogene-Neogene. The north margin of the depression disintegrated in the Quaternary due to the strong activity of the Shunyi fault, forming two new sags. In this paper, Quaternary magnetic stratigraphy of borehole ZK19 in Houshayu sag has been studied. The early Pleistocene and Middle Pleistocene of borehole ZK19 have been obtained in combination with the results of photoluminescence dating. The buried depth of strata bottom in late Pleistocene and Holocene are 434m ~ 128m ~ 29.9 m and 1.35m respectively. The characteristics of activity since Quaternary of Shunyi fault are discussed by comparing and analyzing the thickness and rate of sedimentary strata with ZK12-2 in Ringbo sag. The study shows that the strong activity of Shunyi fault during the early Quaternary Pleistocene resulted in the disintegration of the basin in the northern margin of the Beijing Sag and the Middle Pleistocene. The activity of Shunyi fault is not clear relative to Huangzhuang-Gaoliying fault, and the late Pleistocene, Shunyi fault is strongly related to Huangzhuang-Gaoliying fault, which accelerates the differentiation of the northern margin basin of Beijing sag; Holocene, The Shunyi fault was strongly active and resulted in the development of ground fissures and the destruction of buildings.
【作者单位】：北京市地质调查研究院;中国地质大学生物地质与环境地质国家重点实验室;
【基金】：北京市国土资源局“北京平原区活动断裂监测专项地质调查项目”(京国土环【2009】308号文)资助~~
【分类号】：P542;P512.2

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