Study on Tidal Flat Environment and It's Sedimentary Facies Comparative

WANG Ying; ZHU Da kui; CAO Gui yun

Sedimentary facies of tidal flat indicate that coastal environment is characterized by gentle coastal slope, predominant tidal dy namics, and with plenty of fine grain (silt)sediment supply.The comparative study of sedimentary facies has shown high level agreement betw een present tidal flat and ancient fine tex tural sedimentary rocks of the middle Triassic Huangmaqing Formation in Purple Mountain of Nanjing, and Zhanjiang Formation of early Pleistocene Period in Haikou.Besides the similarity in nature of grain size probabili ty diag ram, palosalinity and Brackish paleontology group among the three sedimentary series, the major character of the rocks is the Zonation features with typical structures as rhy thmic thick-thin laminal of silty and clayey sediments, with ripples, herring bone shaped or dune-shaped cross beddings in the lower sandy sections, and polygon structures or desiccated clay cracks, clay pebbles, worm tubes or calcic concretions in the upper muddy sections.These series of sedimentary facies reflect a lower energy environment of land-sea interaction along coastal shallow sea.

1.

2. The Open Laboratory of Ore Deposit Geochemistry, Chinese Academy of Sciences, Guiyang 550002

Received Date: 2003-02-10

Rev Recd Date: 2003-03-20

Publish Date: 2003-12-10

Key words:

Abstract: Sedimentary facies of tidal flat indicate that coastal environment is characterized by gentle coastal slope, predominant tidal dy namics, and with plenty of fine grain (silt)sediment supply.The comparative study of sedimentary facies has shown high level agreement betw een present tidal flat and ancient fine tex tural sedimentary rocks of the middle Triassic Huangmaqing Formation in Purple Mountain of Nanjing, and Zhanjiang Formation of early Pleistocene Period in Haikou.Besides the similarity in nature of grain size probabili ty diag ram, palosalinity and Brackish paleontology group among the three sedimentary series, the major character of the rocks is the Zonation features with typical structures as rhy thmic thick-thin laminal of silty and clayey sediments, with ripples, herring bone shaped or dune-shaped cross beddings in the lower sandy sections, and polygon structures or desiccated clay cracks, clay pebbles, worm tubes or calcic concretions in the upper muddy sections.These series of sedimentary facies reflect a lower energy environment of land-sea interaction along coastal shallow sea.

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Study on Tidal Flat Environment and It's Sedimentary Facies Comparative

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