[1]王毅,郭炳跃,郭东峰,等.长江安庆段河谷区第四系沉积特征与古河道演化[J].华东地质,2023,44(03):300-312.[doi:10.16788/j.hddz.32-1865/P.2023.03.006]
　WANG Yi,GUO Bingyue,GUO Dongfeng,et al.Quaternary sedimentary characteristics and paleochannel evolution in the Anqing valley of the Yangtze River[J].East China Geology,2023,44(03):300-312.[doi:10.16788/j.hddz.32-1865/P.2023.03.006]
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长江安庆段河谷区第四系沉积特征与古河道演化()
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《华东地质》[ISSN:2096-1871/CN:32-1865/P]

卷:
44
期数:
2023年03期
页码:
300-312
栏目:
长江经济带资源与环境专辑
出版日期:
2023-09-28

文章信息/Info

Title:
Quaternary sedimentary characteristics and paleochannel evolution in the Anqing valley of the Yangtze River
作者:
王毅1;  郭炳跃1;  郭东峰1;  张斌1;  苏晶文2;  戴俊成1
1. 江苏省地质勘查技术院, 江苏 南京 210049;
2. 中国地质调查局南京地质调查中心, 江苏 南京 210016
Author(s):
WANG Yi1;  GUO Bingyue1;  GUO Dongfeng1;  ZHANG Bin1;  SU Jingwen2;  DAI Juncheng1
1. Geological Exploration Technology Institute of Jiangsu Province, Nanjing 210049, Jiangsu, China;
2. Nanjing Center, China Geological Survey, Nanjing 210016, Jiangsu, China
关键词:
沉积特征; 沉积相; 长江河谷; 第四系; 安庆地区
Keywords:
sedimentary characteristics; sedimentary facies; Yangtze valley; Quaternary; Anqing area
分类号:
P597.3 P588.122
DOI:
10.16788/j.hddz.32-1865/P.2023.03.006
摘要:
长江安庆段NE向河谷中发育河流相与山麓相两套沉积体系。文章基于实测第四系钻孔资料,通过构建NW向、NNE向钻孔对比剖面,揭示了该区长江冲积平原、岗地等地质地貌单元地层组合特征;结合区域新构造运动特征、气候变化等资料分析,探讨了长江河谷古河道演化历程。研究结果表明:长江安庆段河谷区发育了至少2个由含砾粗砂到含粉砂黏土的河流沉积旋回,两侧岗地同期沉积了下蜀组及戚家叽组山麓相地层;第四系沉积物由河流冲积、风成堆积等多种成因类型组成,经历了早中更新世冲洪积,中晚更新世风成堆积、河流下切侵蚀与充填等地质过程;新构造运动、冰期-间冰期气候旋回波动、海平面升降等因素共同影响了长江安庆段古河道演化历程。
Abstract:
Two sets of sedimentary systems, fluvial facies and piedmont facies, are developed in the NE trending valley of the Anqing section of the Yangtze River. Based on the measured Quaternary boreholes, through comparing cross sections of the NW and NNE directional boreholes, this paper revealed the stratigraphic combination characteristics of geological and geomorphic units, such as the alluvial plain and hillock of the Yangtze River. Then, we discussed the evolution process of the paleochannel in the Yangtze River valley in combination with the regional neotectonics characteristics, climate change and other information. The results show that there are at least two river sedimentary cycles developed in the Anqing valley along the Yangtze River, ranging from gravelly coarse sand to silty clay. The Xiashu Formation and Qijiaji Formation were deposited simultaneously on both sides of the hilly land. Quaternary sediments are composed of river alluvium, aeolian sediments and other genetic types, and have experienced geological processes such as early-middle Pleistocene alluvial-proluvial process, middle-late Pleistocene aeolian accumulation, river undercutting erosion and filling. Neotectonics, climate changes during the glacial to the interglacial, sea level eustacy and other factors jointly affect the evolution of the ancient channel in the Anqing section of the Yangtze River.

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备注/Memo

备注/Memo:
收稿日期:2023-2-16;改回日期:2023-4-29。
基金项目:中国地质调查局"皖江经济带安庆—马鞍山沿江段1∶5万环境地质调查(编号:DD20160247)"项目资助。
作者简介:王毅,1990年生,男,工程师,硕士,主要从事水工环地质调查和第四纪地质研究工作。Email:670363358@qq.com。
更新日期/Last Update: 1900-01-01