临河凹陷QK3钻孔220 ka以来的沉积环境演变记录  

The Sedimentary Environment Evolution Record of QK3 Borehole in Linhe Depression since 220 ka

作　　者：毕志伟[1,2] 杨振京 王利康[1,2] 宁凯 杨庆华 刘玮 BI Zhi-wei;YANG Zhen-jing;WANG Li-kang;NING Kai;YANG Qing-hua;LIU Wei(Institute of Hydrologic and Environmental Geology, ChineseAcademy of Geological Sciences, Shijiazhuang 050061, China;Key Laboratory of Quaternary Chronology and Hydrological Environment Evolution, China Geological Survey, Shijiazhuang 050803, China)

机构地区：[1]中国地质科学院水文地质环境地质研究所,石家庄050803 [2]中国地质调查局第四纪年代学与水文环境演变重点实验室,石家庄050803

出　　处：《科学技术与工程》2021年第22期9229-9235,共7页Science Technology and Engineering

基　　金：中国地质科学院水文地质环境地质研究所基本科研业务费项目(SK202012);中国地质调查局地质调查项目(1212010913010)。

摘　　要：临河凹陷是河套盆地的一部分,黄河由西向东流经,其内发育了巨厚的沉积地层,是第四纪环境演变的理想场所。通过分析临河凹陷中QK3钻孔地层的粒度特征,结合年代地层重建了研究区中更新世晚期以来的沉积环境演变过程:189.9 ka.BP~220.26 ka.BP表现为滨湖相沉积;117.47 ka.BP~189.9 ka.BP表现为河流边滩沉积;117.47 ka.BP~189.9 ka.BP表现为河流边滩沉积;38.5 ka.BP~117.47 ka.BP表现为河流边滩和河漫湖泊的交替沉积环境;13.49 ka.BP~38.5 ka.BP表现为河流边滩相沉积环境;13.49 ka.BP以来表现为河漫湖泊相沉积环境。The Linhe Depression is a part of the Hetao basin.The Yellow River flows from west to east with a huge thickness of sedimentary strata,which is an ideal place for Quaternary environmental evolution.By analyzing the grain size characteristics of the QK3 borehole strata in the Linhe Depression,combined with the chronostratigraphy,the evolution of the sedimentary environment since the late middle pleistocene in the study area was reconstructed.The results show that,189.9 ka.BP~220.26 ka.BP appeared as lakeside deposits,117.47 ka.BP~189.9 ka.BP is represented by river bank deposits,117.47 ka.BP~189.9 ka.BP is represented by river bank deposits;38.5 ka.BP~117.47 ka.BP is represented by alternate deposits of river banks and flood lakes environment,13.49 ka.BP~38.5 ka.BP shows the sedimentary environment of river bank facies.Since 13.49 ka.BP,it shows the sedimentary environment of flood and lake facies.

关 键 词：粒度 古环境 临河凹陷 晚中更新世 

分 类 号：P534.63[天文地球—第四纪地质学]