潮白河下游晚更新世晚期-全新世早期地层粒度特征  

Grain Size Analysis of the Late Pleistocene-Early Holocene Sediments in the Lower Chaobai River

作　　者：白相东[1,2] 张艳[1,2] 关成尧[1] 袁四化[1] 陆丽娜[1] 马旭东 李开玉 BAI Xiang-dong;ZHANG Yan;GUAN Cheng-yao;YUAN Si-hua;LU Li-na;MA Xu-dong;LI Kai-yu(Institiate of Disaster Prevention1,Sanhe 065201,China;Institiate of Engineering Mechanics,CEA2,Harljin 150080,China;The Institute of Geology,Chinese Academy of Geological Sciences3,Beijing 100037,China)

机构地区：[1]防灾科技学院,三河065201 [2]中国地震局工程力学研究所,哈尔滨150080 [3]中国地质科学院地质研究所,北京100037

出　　处：《科学技术与工程》2018年第17期7-13,共7页Science Technology and Engineering

基　　金：河北省高等学校科学技术研究项目(Z2015022);中央高校基本科研业务费专项资金(Z2015022;ZY20160109);中国地震局教师科研基金(20150104)资助

摘　　要：通过潮白河下游第四纪剖面测量,采集光释光样品2个,显示剖面年龄为(12.36±1.76)^(5.15±0.80)ka,沉积时代为晚更新世晚期到全新世早期。结合地层厚度,计算出该地区平均沉积速率为0.038 cm/a。采集并测试37个粒度样品,频率曲线特征是双峰、左偏双峰、右偏双峰及三峰,说明沉积物成分复杂。概率累计曲线特征是三段式,滚动组分含量存在变化,说明水动力条件存在强弱的更替。地层自下而上沉积模式是黏土-粉砂-粉砂质黏土。结合区域地质特征,综合分析潮白河下游晚更新世晚期-全新世早期沉积环境为泛滥平原沉积。本文研究结果可为潮白河下游沉积过程研究、地下水综合利用与开发提供重要地质资料。The quaternary section of lower Chaobai River was measured,and two OSL samples were collected.The OSL data shows that the profile age is（ 12. 36 ± 1. 76） ka to（ 5. 15 ± 0. 80） ka by two OSL samples. Combined with the thickness of the stratum,we calculated the sedimentation rate is 0. 038 cm/a in the studying segment. Frequency distribution curves of 37 samples show double kurtosis,left partial double kurtosis,right partial double kurtosis and triple kurtosis,which indicates that the composition of sediments is complex. The probability accumulation curves is three stages with the chang of the rolling components,showing a changing energy sedimentary environment. Sedimentary model is clay-silt-silt-clay. Combine with the regional features,comprehensive analysis indicate the Late Pleistocene-Early Holocene Sediments in the lower Chaobai River,river environment were flood plain deposit. Fundamental geology data was provided for research of the process of sedimentation of lower reaches of Chaobai River and underground water comprehensive utilization.

关 键 词：潮白河 粒度分析 光释光 泛滥平原 

分 类 号：P534.63[天文地球—第四纪地质学]