3.34Ma以来河北平原衡水地区沉积物粒度特征及沉积环境意义  

Sediment grain size characteristics and sedimentary environment significance in Hengshui area,Hebei Plain since 3.34 Ma

作　　者：张胄 于娟[2,3] 吴利杰 张翼龙 李瑞[1] ZHANG Zhou;YU Juan;WU Lijie;ZHANG Yilong;LIRui(College of WaterResources and Environment,Hebei University of Geosciences,Shijiazhuang 050031;Institute of Hydrogeology and Environmental Geology,CAGS,Shijiazhuang 050061;Key Laboratory of Quaternary Chronology and Hydrological Environmental Evolution,CAGS,Shijiazhuang 050061,China)

机构地区：[1]河北地质大学水资源与环境学院,石家庄050031 [2]中国地质科学院水文地质环境地质研究所,石家庄050061 [3]中国地质科学院第四纪年代学与水文环境演变重点实验室,石家庄050061

出　　处：《干旱区资源与环境》2021年第3期103-108,共6页Journal of Arid Land Resources and Environment

基　　金：中国地质调查局中国地质科学院基本科研业务费(JYYWF20182803、JYYWF20181304)资助。

摘　　要：通过对河北平原衡水地区JZ孔的粒度测试与分析,探讨了3.34Ma以来该地区沉积物粒度特征、水动力条件及沉积环境演变历史。研究表明:3.34Ma.以来,沉积物平均粒径在0.74~4.80φ之间,粒径偏粗;分选系数处于0.88~2.21之间,属差-较好分选性;偏态在-0.2~2.89之间,以正偏为主;峰态范围处于1.88~13.88之间,尖锐。频率分布曲线主要为不对称单峰态,峰值在0~4φ之间,概率累积曲线二段式跳跃组分含量占比多,三段式以滚动组分为主。3.34~2.58Ma B.P.水动力条件弱,主要发育浅湖洼地环境;2.58~0.78Ma B.P.早期由浅湖向洼地环境过渡,夹河流环境,中期滨湖与河流环境交替,晚期为洼地环境;0.78~0.128Ma B.P.期间由洼地向河流环境转变;0.128~0.01Ma B.P.早期发育滨湖环境,晚期水动力条件由弱变中等,洼地与河流环境先后发育;0.01Ma B.P.至今为泛滥平原。Based on the grain size test and analysis of JZ hole in Hengshui area of Hebei Plain,the grain size characteristics,hydrodynamic conditions and evolution history of sedimentary environment in this area since 3.34 ma are discussed.The results show that:since 3.34 ma B.P.,the average grain size of sediments is between 0.74~4.80φ,and the particle size is relatively coarse;the sorting coefficient is between 0.88~2.21;the SK1 is between-0.2~2.89,mainly positive deviation;the KG is between 1.88~13.88,sharp.The frequency distribution curve is mainly asymmetric single peak state,the peak value is between 0~4φ.The two-stage jump component content is more in the probability cumulative curve,and the rolling component is dominant in the three-stage curve.3.34~2.58 Ma B.P.has weak hydrodynamic conditions,mainly developed shallow lake depression environment;2.58~0.78 Ma B.P.transited from shallow lake to depression environment in the early stage,mixed with river environment;in the middle stage,lakeside and river environment alternated,and in the late stage,it changed from depression to river environment during 0.78~0.128 Ma B.P.;0.128~0.01 Ma B.P developed lakeside environment in the early stage,and the hydrodynamic condition changed from weak to moderate in the late stage,depression and river environment developed successively;0.01 Ma B.P.is now a flood plain.

关 键 词：河北平原 衡水地区 粒度特征 沉积环境 

分 类 号：P512.2[天文地球—地质学]