顺义断裂带北段第四纪活动规律

发布时间：2018-09-11 14:52

【摘要】：顺义断裂带位于北京平原北部,是北京平原区北东向构造中一条重要的第四纪活动断裂带。其活动的潜在破坏对北京城市发展很是不利,因此对其活动性研究意义重大。前人研究表明,顺义断裂带为第四纪同沉积断层,地层沉积时断层正在活动,下降盘呈相对凹陷地形,易于接受沉积,上升盘呈相对隆起地形不易接受沉积,所以上下两盘沉积物厚度呈现巨大差异。基于前人这一研究成果,本文在综合物探对顺义断裂带精确定位基础上,获取断裂带上下两盘第四纪钻探成果,对钻孔进行岩性与测井岩相分析、沉积旋回分析,辅助古地磁、光释光测试成果,对断裂带上下两盘第四纪地层开展综合地层对比,对第四纪以来顺义断裂带活动规律讨论。基于年代地层和岩性岩相综合分析,顺义断裂带下降盘全新世深度为10m、晚更新世深度为66.5m、中更新世深度为153.3m、早更新世深度为463.9m。沉积上,经历了河流冲积相到湖沼相到河流冲积相的沉积环境的演化,大致可以划分为15个小沉积旋回。而断裂带上升盘全新世深度为9.6m、晚更新世深度为57.5m、中更新世深度为83.4m、早更新世深度为296.5m。沉积上,经历了河流冲积相到湖沼相到河流冲积相的沉积环境的演化,大致可以划分为24个小沉积旋回。对断裂带上下两盘的综合对比,顺义断裂带全新世活动速率为0.004mm/a,晚更新世平均活动速率为0.0072mm/a,中更新世活动速率为0.0094mm/a,早更新世活动速率为0.0054mm/a。整个第四纪呈现活动强度特点为:中更新世之前活动速率递增,中更新世活动速率最大,其后活动速率逐渐减小。
[Abstract]:The Shunyi fault zone is an important Quaternary active fault zone in the north of Beijing plain. The potential damage of its activities is unfavorable to the urban development of Beijing, so it is of great significance to study its activity. Previous studies have shown that the Shunyi fault zone is a Quaternary synsedimentary fault, the fault is active in stratigraphic deposition, the descending surface is relatively concave topography, and it is easy to accept the deposition, while the rising surface is relatively uplift terrain. So there is a huge difference in sediment thickness between the next two plates. Based on the previous research results, based on the accurate location of Shunyi fault zone by comprehensive geophysical exploration, two Quaternary drilling results were obtained in this paper. Lithology and logging lithofacies analysis, sedimentary cycle analysis and paleomagnetic assistance were carried out. Based on the results of photoluminescence measurement, two sets of Quaternary strata in the fault zone are comprehensively correlated, and the active regularity of the Shunyi fault zone since Quaternary is discussed. Based on the comprehensive analysis of chronostratigraphy and lithofacies, the depth of downtrend plate of Shunyi fault zone is 10 m in Holocene, 66.5 m in late Pleistocene, 153.3 m in middle Pleistocene and 463.9 m in early Pleistocene. The sedimentary environment of fluvial alluvial facies to lacustrine facies to fluvial alluvial facies can be divided into 15 small sedimentary cycles. The depth of Holocene, late Pleistocene, Middle Pleistocene, early Pleistocene and early Pleistocene are 9.6 m, 57.5 m, 83.4 m and 296.5 m, respectively. The sedimentary environment of fluvial alluvial facies to lacustrine facies to fluvial alluvial facies can be roughly divided into 24 small sedimentary cycles. The Synthetical comparison of the two faults shows that the Holocene activity rate is 0.004mm / a, the late Pleistocene average activity rate is 0.0072mm / a, the middle Pleistocene activity rate is 0.0094mm / a, and the early Pleistocene activity rate is 0.0054mm / a. The activity intensity of the whole Quaternary is as follows: the activity rate increased before the middle Pleistocene epoch, the maximum activity rate in the middle Pleistocene epoch, and the activity rate gradually decreased after the middle Pleistocene.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P542

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