SEDIMENTS DISTRIBUTED ON BACKSIDE TIDAL FLATSBETWEEN WAGEROOGE BARRIER ISLAND (NORTHSEA) AND MAINLAND, CLAY MINERAL, HEAVY METALAND ORGANIC CARBON

Wang Shousong; Chen Changming; Irion G

The aim of the present investigation is to demonstrate the mineralogy and geochemistry of the tidal flat microenvironment in a restricted area and to reveal their variation caused by sedimentation processes. The sedimentary samples taken from different places of the backside tidal flats between the Wagerooge barrier island and the mainland south coast, West Germany are used for grain size analysis and measurement of heavy metals: Fe, Mn, Cu, Pb, Zn and organic carbon. These samples are representative of the average characteristics of sedimentary column of 20cm depth under tidal surface. The grain size distribution on the tidal flats shows a general mainland-parellel zonation. The north salt marsh near the barrier island contains a plenty of sands blown from barrier island sand dune. Clay mineral composition and the content of heavy metals: Fe, Cu, Mn, Pb, Zn in 2μm fine fraction are almost equal in different places of the tidal flats. It indicates that there is no local input of them and tidal flat sediments have suffered the sufficient mixing induced by repeated erosion and resedimentation under the effect of tidal currents. In addition, in all samples illite as a dominent clay mineral is followed by smectite, kaolinite and chlorite, which corresponds to clay mineral association found in the North Sea. In the north and south salt marshes, there is the highest organic carbon content, which may be probably related to the in site formation. Near the tidal inlet organic carbon content increases relatively because most of organic carbon come from the North Sea with tidal currents through the inlet.

Institute of Geology, Academia Sinica, Beijing;

Instititute of Marine Geology and Marine Biology Senckenberg, West Germany

Received Date: 1986-04-25

Publish Date: 1988-06-10

Abstract: The aim of the present investigation is to demonstrate the mineralogy and geochemistry of the tidal flat microenvironment in a restricted area and to reveal their variation caused by sedimentation processes. The sedimentary samples taken from different places of the backside tidal flats between the Wagerooge barrier island and the mainland south coast, West Germany are used for grain size analysis and measurement of heavy metals: Fe, Mn, Cu, Pb, Zn and organic carbon. These samples are representative of the average characteristics of sedimentary column of 20cm depth under tidal surface. The grain size distribution on the tidal flats shows a general mainland-parellel zonation. The north salt marsh near the barrier island contains a plenty of sands blown from barrier island sand dune. Clay mineral composition and the content of heavy metals: Fe, Cu, Mn, Pb, Zn in 2μm fine fraction are almost equal in different places of the tidal flats. It indicates that there is no local input of them and tidal flat sediments have suffered the sufficient mixing induced by repeated erosion and resedimentation under the effect of tidal currents. In addition, in all samples illite as a dominent clay mineral is followed by smectite, kaolinite and chlorite, which corresponds to clay mineral association found in the North Sea. In the north and south salt marshes, there is the highest organic carbon content, which may be probably related to the in site formation. Near the tidal inlet organic carbon content increases relatively because most of organic carbon come from the North Sea with tidal currents through the inlet.

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Reference (22)

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SEDIMENTS DISTRIBUTED ON BACKSIDE TIDAL FLATSBETWEEN WAGEROOGE BARRIER ISLAND (NORTHSEA) AND MAINLAND, CLAY MINERAL, HEAVY METALAND ORGANIC CARBON

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