Assemblages of lebensspuren and distribution characteristics in tidal flat of Luanhe delta
WANG Hailin1, ZHANG Bin1, SONG Huibo1,2, WANG Changzheng1, HU Bin1,2, ZHANG Lijun1,2
1 School of Resources and Environment,Henan Polytechnic University,Henan Jiaozuo 454003,China; 2 Key Laboratory of Biogenic Traces and Sedimentary Minerals of Henan Province,Henan Jiaozuo 454003,China
Abstract：The characteristics,distribution and assemblage of lebensspuren and their relationships with sedimentary environment and sediment properties are significant for the study of trace fossils and palaeoenvironment. However,the research on lebensspuren started late and few related work is found in China. The paper discussed the composition,assemblage and distribution characteristics of lebensspuren in tidal flat of Luanhe delta,and analyzed the relationship between the biological assemblage and the sedimentary environments. The results are as follows: (1)The lebensspuren at the surface of bedding mainly include the repichnia and trails made by arthropoda,annelida and gastropods,and the lebensspuren in the bedding include the burrows approximately perpendicular and parallel to bedding plane,in which the domichnia is dominant with high abundance and various types. (2)Three kinds of biological assemblages are established. Type I is characterized by Y-shaped and vertical tubular burrows with locally high abundance. The epigenic burrows and trails on the bedding plane are less,and the trace makers mainly include Nereis succinea and Brachyura. The bottom of the sediments are characterized as high sand content,high intensity hydrodynamics and low organic matter content,indicating the sandy delta tidal flat sedimentary environment. Type II is characterized as various burrows in the substrate and numerous trails on the surface of bedding. The burrows in the substrate include vertical tubular,J-shaped,U-shaped,Y-shaped and branched burrows with high abundance,and the trace makers mainly include Nereis succinea and Brachyura. The lebensspuren on the formation surface mainly include repichnia and trackways,e.g., Nereis succinea,Brachyura,Glossaulax didyma and Paguridae. The substrate sediments are characterized as high muddy content,high water content and high organic matter content,forming in the middle and lower tidal area of delta tidal flat. Type Ⅲ is characterized by the burrows approximately perpendicular and parallel to the bedding plane and motion traces on the bedding surface. The burrows in the substrate include vertical tubular,J-shaped,U-shaped,Y-shaped and complex branched burrows,which are mainly made by Brachyura,mud beetles and their larvaes. The burrows parallel to bedding plane are mainly made by Cryllotalpa,mud beetles and their larvaes. The motion traces on the bedding surface include the trackways made by Brachyura and footprint made by birds. The substrate sediments for type Ⅲ assemblage showed the characteristics of high muddy content,low water content,high organic matter content and high degree of consolidation,indicating the high tidal area of delta tidal flat. (3)Based on the analyses of lebensspuren assemblage,distribution characteristics and the relationship with the substrate sediments properties and sedimentary environment,a sedimentary environment distribution model of lebensspuren in deltaic tidal flat was established. The research results can not only acted as a basis for the identification of the sedimentary environment of the ancient delta tidal flat,but also provide evidence for the sedimentary environment restoration of similar relic fossil assemblages.
WANG Hailin,ZHANG Bin,SONG Huibo et al. Assemblages of lebensspuren and distribution characteristics in tidal flat of Luanhe delta[J]. JOPC, 2022, 24(6): 1179-1192.
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