地理科学 ›› 2014, Vol. 34 ›› Issue (10): 1262-1269.doi: 10.13249/j.cnki.sgs.2014.010.1262

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黄河三角洲潮滩沉积物磁性特征与沉积环境分析

彭俊1,2(), 陈洪全1, 马随随1, 李志文1   

  1. 1. 盐城师范学院城市与资源环境学院,江苏 盐城 224002
    2. 华东师范大学河口海岸学国家重点实验室,上海 200062
  • 收稿日期:2013-05-06 修回日期:2013-10-26 出版日期:2014-10-10 发布日期:2014-10-10
  • 作者简介:

    作者简介:彭 俊(1980-),男,安徽宁国人,讲师,博士,主要从事河口海岸沉积动力与地貌动力学研究。E-mail:ipengjun800506@163.com

  • 基金资助:
    河口海岸学国家重点实验室开放课题基金(SKLEC-KF201305)、国家自然科学基金(41306077)资助

Magnetic Properties of Sediment and Sedimentary Environment in Tidal Flat of the Yellow River Delta

Jun PENG1,2(), Hong-quan CHEN1, Sui-sui MA1, Zhi-wen LI1   

  1. 1. School of Urban and Resources Environment, Yancheng Teachers University, Yancheng, Jiangsu 224002, China
    2. State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China
  • Received:2013-05-06 Revised:2013-10-26 Online:2014-10-10 Published:2014-10-10

摘要:

环境磁学方法作为沉积记录研究的重要手段,已在黄土、湖泊和陆架沉积物中得到广泛应用,但将此方法应用于潮滩沉积环境的研究并不多。因此,通过测量黄河三角洲潮滩YDZ1柱样沉积物磁学和粒度参数,结合AMS14C测年数据,对末次冰盛期后黄河三角洲潮滩沉积物磁性特征与沉积环境进行分析。结果表明:以假单畴(PSD)~多畴(MD)晶粒为主的亚铁磁性矿物主导了潮滩沉积物的磁性特征,磁学参数中的χARMARM/SIRM和χARM/χ可视为粘土(<4 μm)或细粒级组分(<32 μm)含量的代用指标。潮滩沉积相序自上而下为泛滥平原相、河流相、三角洲前缘相、浅海相、潮坪相和河流相,沉积环境表现为强(陆相)、弱(海相)、强(陆相)的演变过程。

关键词: 黄河三角洲, 潮滩, 磁性特征, 沉积环境

Abstract:

Environmental magnetism is a newly rising frontier science among earth science, environmental science and magnetism. It reveals environmental actions, environmental processes and environmental problems of different temporal and spatial scales through the magnetic measurement and analysis of the magnetic mineral assemblage and characteristics. Due to the type, the content and the grain size of magnetic mineral related to the sediment sources, sediment transport capacity and early digenesis, and changes of these factors are heavily influenced by environmental changes, the information of sedimentary environment change can be extracted through the analysis of the magnetic characteristics of sediment. At present, environmental magnetic method has been widely used in loess, lake and shelf deposits as an normal mean for studying sedimentary record, but using this method on sedimentary environment in tidal flat is seldom. Hence, by measuring the magnetic parameters and the grain size parameters of the core YDZ1 in tidal flat of the Yellow River Delta, and combined with data of AMS14C dating, this paper analyzes the sediment magnetic properties and its sedimentary environment after the Last Glacial Maximum in tidal flat of the Yellow River Delta. The results show that the ferromagnetic mineral of pseudo-single domain (PSD) and multi-domain (MD) dominates the sediment magnetic properties of the core YDZ1. Among the magnetic properties of sediment, the parameters of χARM, χARM/SIRM and χARM/χ can be regarded as the substituted indexes for the clay (<4 μm) content or the fine-grained component (<32 μm) content. The sedimentary facies from surface to bottom in tidal flat of the Yellow River Delta has experienced the floodplain facies, the river facies, the delta-front facies, the neritic facies, the tidal flat facies and the river facies, and the sedimentary dynamical environment had a variation process from strong to weak, and then strong again.

Key words: the Yellow River Delta, tidal flat, magnetic properties, sedimentary environment

中图分类号: 

  • P736