Composition and distribution characteristics of modern biogenic traces in intertidal flat in Qingdao and Rizhao area,Shandong Province
Wang Hailin1, Hu Bin1,2, Song Huibo1
1 School of Resource and Environment,Henan Polytechnic University,Jiaozuo 454003,Henan; 2 Key Laboratory of Biogenic Traces & Sedimentary Minerals of Henan Province,Jiaozuo 454003,Henan
Abstract：Many traces of modern animals are found in the intertidal flat in Qingdao and Rizhao area,Shandong Province. By analyzing the relationship between the traces and the sedimentary environment,the results indicate that: (1)The major surface traces observed in the study area are the repichnia of gastropods,and the major interior traces are the domichnia. The type of the traces is multitudinous. (2)Two biogenic traces assembles are established. One is the biogenic traces assemble in the upper intertidal flat,which are mainly repichnia made by Cerithidea cingulata,repichnia,fodinichnia and domichnia made by Nereis succinea, domichnia made by Mactra veneriformis Reeve,repichnia and domichnia made by Periophthalmua cantonensis,domichnia made by Lingula anatina, domichnia and fodinichnia made by Brachyura. The characteristics of the sediment where this traces assembles produced include the high clay content,the abundance of water,oxygen and organic matter,the stable sediment. The other is the biogenic traces assemble produced in the middle and lower intertidal flat,which are mainly repichnia and cubichnia made by Natica maculosa,repichnia and cubichnia made by Glossaulax didyma,repichnia made by Solen gouldi,repichnia and domichnia made by Oratosquilla oratoria,domichnia made by Lingula anatina,domichnia and fodinichnia made by Brachyura. The characteristics of the sediment where this traces assembles produced include the lower clay content,the rough granularity,the interstitial water hold hard,the lower content of the organic matter,etc. For the intertidal flat of the study area belongs to changeable marine environment,this biogenic traces assembles can indicate the marine intertidal flat sediment environment of monsoon climate of medium latitudes. (3)By analyzing the modern animals and the traces' distribution characteristics,the relationship between the traces and the substrate,and summarizing the relationship of the traces' distribution characteristics and the sedimentary environment,the biogenic traces assemble and the distribution model of ichnoassemblages in the study area was established.
Wang Hailin,Hu Bin,Song Huibo. Composition and distribution characteristics of modern biogenic traces in intertidal flat in Qingdao and Rizhao area,Shandong Province[J]. JOPC, 2017, 19(4): 663-676.
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