河北三河晚更新世地层粒度特征分析

发布时间：2018-01-25 17:31

本文关键词： 粒度参数概率累积曲线晚更新世河流砂坝泛滥平原　出处：《地质学报》2016年05期 　论文类型：期刊论文

【摘要】：本文通过详细测量河北三河齐心庄一带第四纪剖面、采集光释光测年样品和粒度样品,分析该区地层形成年龄、沉积速率、各粒度样品粒度参数、频率分布曲线及概率累积曲线,进而推断其沉积环境。实测剖面显示地层可以分为20层,沉积物以细砂、粉砂和黏土为主。第2层光释光地质年龄为12.23±1.32ka,第19层光释光地质年龄为19.35±2.10ka,故实测剖面为晚更新世末期堆积,根据地层厚度及年龄测定结果测算出该区平均沉积速率为0.071cm/a。12个粒度样品频率分布曲线均为不对称的单峰态,表明沉积物成分单一,为相对稳定条件下形成。概率累积曲线分为两段式和三段式,滚动组分较少,总体为能量相对不高的沉积环境。地层自下而上呈现明显的旋回性沉积特征,存在两种韵律沉积模式:"中砂-细砂-粉砂"和"粉砂-黏土"。结合区域地质特征,综合分析结果显示河北三河晚更新世地层形成于相对稳定的低水能条件下的河流环境,进一步可细分为河流砂坝和泛滥平原沉积。本文研究结果对于探讨华北北部平原的形成与发展过程、潮白河下游的变迁历史、晚更新世末期的沉积速率提供了重要的基础资料和数据。实测剖面位于新夏垫断裂的下盘,本文测试结果对于研究新夏垫活断裂两盘的差异性活动和断裂性质提供了重要的资料。
[Abstract]:In this paper, the Quaternary section of Qixinzhuang area in Sanhe River, Hebei Province is measured in detail, and the age of formation, deposition rate and granularity parameters of the samples are analyzed. The frequency distribution curve and probability accumulation curve are used to infer the sedimentary environment. The measured profiles show that the strata can be divided into 20 layers and the sediments are fine sand. The age of photoluminescence geology is 12.23 卤1.32 ka in the second layer and 19.35 卤2.10 ka in the 19th layer. Therefore, the measured profile is the late Pleistocene accumulation. According to the results of stratigraphic thickness and age measurement, the average deposition rate of 0.071 cm / a.12 grain size samples in this area is determined to be an asymmetric single peak state, indicating that the sediment composition is single. The probability accumulation curve can be divided into two sections and three sections with less rolling components and a relatively low energy sedimentary environment. The strata show obvious cyclic sedimentary characteristics from bottom to top. There are two rhythmic sedimentary models: "medium sand fine sand silt" and "silt clay". The comprehensive analysis results show that the late Pleistocene strata of Sanhe River in Hebei Province were formed in a relatively stable river environment under low water energy conditions. It can be further subdivided into river bar and flood plain sedimentation. The results of this paper are useful to discuss the formation and development process of North China Plain and the vicissitude history of the lower Chaobai River. The sedimentary rate at the end of the late Pleistocene provides important basic data and data. The results of this paper provide important data for the study of the differential activities and fracture properties of the two active faults in the new summer cushion.
【作者单位】：防灾科技学院地震科学系;中国地质大学(北京)地球科学与资源学院;
【基金】：自然科学基金面上项目(41372216) 中央高校创新项目团队资助计划(ZY20120102)共同资助
【分类号】：P534.631
【正文快照】： 注:本文由自然科学基金面上项目(41372216)和中央高校创新项目团队资助计划(ZY20120102)共同资助。河北三河夏垫以1679年发生的8级地震而引起世人的广泛注意,前人先后在该区进行了大量地震方面的研究(Gao Jinghua et al.,2008;HuangXiuming et al.,1991;Jiang Wali et al.,200

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