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河北三河晚更新世地层粒度特征分析
引用本文:刘智荣,沈军,黄静宜,陈耀飞.河北三河晚更新世地层粒度特征分析[J].地质学报,2016,90(5):997-1005.
作者姓名:刘智荣  沈军  黄静宜  陈耀飞
作者单位:1) 防灾科技学院地震科学系, 河北燕郊, 065201;2) 中国地质大学(北京)地球科学与资源学院,北京,100083
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
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。

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
收稿时间:2014/9/22 0:00:00
修稿时间:2015/4/27 0:00:00

Grain Size Analysis of the Late Pleistocene Sediments in Sanhe County, Hebei Province
LIU Zhirong,SHEN Jun,HUANG Jingyi and CHEN Yaofei.Grain Size Analysis of the Late Pleistocene Sediments in Sanhe County, Hebei Province[J].Acta Geologica Sinica,2016,90(5):997-1005.
Authors:LIU Zhirong  SHEN Jun  HUANG Jingyi and CHEN Yaofei
Institution:1) Institute of Disaster Prevention Science and Technology, Yanjiao, Hebei, 065201; 2) School of Earth Sciences and Resources, China University of Geosciences, Beijing, 100083
Abstract:Measurement, dating and grain size analysis of the Quarternary section in Qixinzhuang, Sanhe County, Hebei province, were carried out. The results show that the section was formed in about12.23±1.32 to 19.35±2.10Ka B.P, for the accumulation of late Pleistocene. Based on parameters of grain size, frequency distribution curves and probability accumulation curves, combined with sediment lithology and sedimentary structures, the sedimentary environment of the section, in Sanhe County, Hebei Province were relatively stable low water conditions of the river environment, and can be further subdivided into the river sand dam and flood plain deposit. The test results provide important basic information and data for the formation and development of the northern part of North China, evolution history of the Chaobai River downstream, the deposition rate of late Pleistocene, the activity difference between two discs of the new Xiadian fault and the study of the sediment environment of Dachang sag.
Keywords:parameters of grain size  probability accumulation curves  the late Pleistocene  the river sand dam  the flood plain deposit
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