永定河中下游MIS7以来地层沉积演化及新石器时代以来气候变化
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P534.63;P512.2;X141

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国家自然科学基金项目(41972196)、中国地质调查局项目(12120114007701)及北京市地质矿产勘查开发局项目(PXM2019_158203_000005)联合资助。


Stratigraphic sedimentary evolution of the middle and lower region of the Yongding Rive since MIS7 and its climate evolution since the Neolithic
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    摘要:

    利用廊坊东A27钻孔岩心资料,样品微体生物、孢粉特征综合分析,结合AMS14C测年,对永定河中下游地区MIS7以来的地层进行分析,建立了MIS7以来的沉积地层格架,并对其进行了年代厘定,讨论了该地区大约MIS7阶段以来氧同位素分期气候下的地层及环境效应。结果表明,永定河中下游地区晚第四纪可划分为U1~U8共8个沉积单元,分别对应于MIS1~MIS7以及MIS8晚期的沉积地层,与海洋氧同位素分期有很好的对应关系。U1单元为MIS1形成的湖沼—河谷—泛滥平原沉积,U2单元为MIS2形成硬质黏土(第1硬土层)—下切河谷—湖沼沉积,U3单元为MIS3形成的湖沼—河谷—泛滥平原沉积,U4单元为MIS4形成的河间地块沉积(第2硬土层,暴露失水沉积),U5单元为MIS5形成的湖沼夹分支河道沉积,U6单元为MIS6形成的下切河谷夹短暂湖沼沉积,U7单元为MIS7形成的以湖沼为主沉积,U8单元为MIS8晚期形成的泛滥平原沉积,重塑了MIS7以来沉积环境模式,建立了本区晚第四纪精细年代地层框架。笔者认为永定河中下游在新石器时期以河湖共存为主,在其晚期为湖沼发育达到顶峰,出现泥炭层,直至商周时期后在气候变化影响下湖沼消退转变为泛滥平原面貌,为区域古地理环境及生态修复提供重要参考依据。

    Abstract:

    Based on the core datas of A27 borehole and the characteristics of micropaleontology and sporopollen in the east of Langfang, combined with the AMS14C datas, analyzed the stratum,established the stratigraphic framework, since the MIS7,in the middle and lower region of the Yongding River. In addition, the stratigraphic and environmental effects under the oxygen isotope staging climate are discussed.The results show that stratigraphy can be divided into 8 sedimentary units(U1~U8), respectively, and have a good correspondence with the marine isotope stage, which correspond to the MIS1~MIS7 and late MIS8, in the Late Quaternary of the middle and lower region of the Yongding River. U1 unit is the lacustrine-valley-floodplain sediment formed during MIS1, U2 unit is the hard clay (the first hard clay) -incised valley-lacustrine sediment formed during MIS2, U3 unit is the lacustrine -valley-floodplain sediment formed during MIS3, U4 unit is massife sediment formed during MIS4 (including the second hard clay, exposed dewatered sediment), U5 unit is lacustrine and branch channel sediment formed during MIS5, U6 unit is incised valley during MIS6 with ephemeral Lake and marsh deposit, U7 unit is a lake-marsh deposit formed by MIS7, U8 is floodplain sediment formed during the late MIS8. It reshaped the sedimentary environment model since MIS7 and defined the geologic time scale in the late Quaternary.It is believed that rivers and lakes are coexisted in the Neolithic period, the lake reached its peak, and peat layer appears in its late era, in the middle and lower reaches of the Yongding River.Until the Shang-Zhou dynasties, the limnetic facies fade away and transform into flood plain facies under the influence of climate change.It can provide an important reference for regional palaeogeographic environment and ecological restoration.

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赵勇,杨誉博,李瑞杰,杨吉龙,王强,李亚林,王纯君,魏波,方同明,王志辉. 永定河中下游MIS7以来地层沉积演化及新石器时代以来气候变化[J]. 中国地质, 2021, 48(4): 1188-1199.
ZHAO Yong, YANG Yubo, LI Ruijie, YANG Jilong, WANG Qiang, LI Yalin, WANG Chunjun, WEI Bo, FANG Tongming, WANG Zhihui. Stratigraphic sedimentary evolution of the middle and lower region of the Yongding Rive since MIS7 and its climate evolution since the Neolithic[J]. Geology in China, 2021, 48(4): 1188-1199(in Chinese with English abstract).

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  • 收稿日期:2020-06-04
  • 最后修改日期:2020-06-29
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  • 在线发布日期: 2021-09-03
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