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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χARM,χARM/SIRM和χARM/χ可视为粘土(<4μm)或细粒级组分(<32μm)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。
As an important means of sedimentary record research, environmental magnetism method has been widely used in the sediments of loess, lake and shelf. However, there is not much research on the application of this method to the depositional environment of the tidal flat. Therefore, the magnetic properties and depositional environment of the sediments in the Yellow River Delta after the last ice age were analyzed by measuring the magnetism and grain size parameters of YDZ1 sediments in the tidal flat of the Yellow River Delta and combining with the dating data of AMS14C. The results show that the magnetic properties of the tidal flat sediments dominated by ferrimagnetic minerals mainly composed of pseudo-mononuclear (PSD) ~ multi-domain (MD) grains. ΧARM, χARM / SIRM and χARM / χ in the magnetic parameters Considered as a proxy for clay (<4 μm) or fraction content (<32 μm). The tidal flat sedimentary facies from top to bottom are plain flood plain, fluvial facies, delta front facies, shallow marine facies, tidal flat facies and fluvial facies. The sedimentary environment is characterized by strong (continental), weak (marine), strong Terrestrial) evolution.