Biogenic traces in modern shoal deposits of Andong area, Hangzhou Bay
Song Huibo1,2, Yu Huixin1, Wang Hailin1, Fan Daidu3, Hu Bin1,2, Wang Fang1
1.School of Resource and Environment,Henan Polytechnic University,Jiaozuo.454003,Henan 2.Key Laboratory of Biogenic Traces and Sedimentary Minerals of Henan Province,Jiaozuo.454003,Henan 3 State Key Laboratory of Marine Geology,Tongji University,Shanghai.200092
Abstract：Various trace-makers have been found in the shoal deposits of Andong area,Hangzhou Bay,including mole crickets(Gryllotalpa unispina),mud beetles(Coleptera),mud crabs(Ilyplax ningboensis),Cerithideopsilla cingalata, mud snails(Bullacta),mudskippers or amphibious fishes(Periophthalmua cantonensis),ants and birds. The most abundant traces can be ascribed to Fodinichnia,Domichnia,Repichnia and Pascichnia. Analysis shows that significant variations in type and diversity of traces and their makers are present over the different shoal zonations. (1)The highly-vegetated supratidal flat is featured by the abundance of bird tracks,and feeding and dwelling traces of mole crickets,mud beetles and ants,in which the feeding burrows of mole cricket are the most common. (2)In the upper intertidal flat where a lot of halophilic plants dominate on the muddy substrates,the biogenic traces include the J-,W-or Y-shaped burrows by mud crabs,the pinniform crawling traces by mudskippers,and the arc-shaped,donut-shaped grazing trails and C-shaped reproduction traces by mud snails (Cerithideopsilla cingalata).(3) In the silty substrate of the middle-lower intertidal zones,the biogenic traces are characterized by the irregular grazing trails of mud snails (Cerithideopsilla cingalata) on the bedding plane. It is also found that the distribution of biogenic traces is highly related to the grain sizes and water-saturation of the substrates. This study provides not only a neoichnological approach to tidal-flat sedimentary in the Hangzhou Bay,but also a meaningful modern analogue for sedimentary facies and paleo-environmental interpretations of ancient tidal flats.
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