[Objective]The Pearl River Delta front is a complicated sedimentary system controlled by rivers,waves,and tides. Most previous studies focused on the physical and chemical sedimentary characteristics. However,biogen-ic sedimentary structures are extremely sensitive to the environment;therefore,comprehensive and high resolution research should be conducted.[Methods]Based on sedimentary and ichnological methods,salinity,turbidity,total organic carbon (TOC),grain size analysis,X-ray scans,and three-dimensional (3D) reconstruction were applied to the modern biogenic sedimentary structures in different microenvironments of the Pearl River Delta front.[Results]The main results are as follows:(1) The main trace makers are Bivalve clams,Arthropoda hermit crabs,Crustacean crabs,Annelid bitoothed berbera,and chordate mudskippers. (2) The main biogenic traces include climbing tracks,foot tracks,bird tracks and excretion tracks,and burrows,and the main morphology of burrows include Y,L,U,and I-shape. (3) The diversity,abundance,and bioturbation in the tidal channel and island are higher than the inter-distributary bay.[Conclusions]This study perfected the ichnology of the delta front and modern delta sedimentary en-vironment. Moreover,it resolved the high resolution identification of a paleo-delta front sedimentary system.
modern biological tracesichnologydelta frontPearl River Delta
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