Occurrence of authigenic siderites in the Early Holocene coastal deposit in the west coast of Korea: an indicator of depositional environment
The macrotidal muddy deposits around Youngjong Island in the west coast of Korea with a radiocarbon dating of ca. 8000 yr BP contain micro-scale (ca. 150 μm) siderite concretions. The authigenic siderites exhibit the aggregated spherulitic textures with well-developed rhombs on the grain surfaces, w...
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| Veröffentlicht in: | Geosciences journal (Seoul, Korea) Korea), 1999-09, Vol.3 (3), p.163-170 |
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| container_title | Geosciences journal (Seoul, Korea) |
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| creator | Khim, Boo-Keun Choi, Kyung-Sik Park, Yong-Ahn Oh, Jae-Kyung |
| description | The macrotidal muddy deposits around Youngjong Island in the west coast of Korea with a radiocarbon dating of ca. 8000 yr BP contain micro-scale (ca. 150 μm) siderite concretions. The authigenic siderites exhibit the aggregated spherulitic textures with well-developed rhombs on the grain surfaces, which reflects good preservation. Geochemical analyses indicate that the concentrations of Mg (mean 2.6 mol%) and Ca (mean 9.4 mol%) are low whereas those of Fe (mean 70.4 mol%) and Mn (mean 17.6 mol%) are relatively high. The chemical composition suggests that the authigenic siderites might have precipitated in a non-marine environment. The occurrence of such siderites in the early Holocene sediments, considering the stratigraphic level with respect to the well-established sea-level curve helps recognize the non-marine depositional environment existed before the formation of modern tidal flats along the west coast of Korea. |
| doi_str_mv | 10.1007/BF02910272 |
| format | Article |
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The authigenic siderites exhibit the aggregated spherulitic textures with well-developed rhombs on the grain surfaces, which reflects good preservation. Geochemical analyses indicate that the concentrations of Mg (mean 2.6 mol%) and Ca (mean 9.4 mol%) are low whereas those of Fe (mean 70.4 mol%) and Mn (mean 17.6 mol%) are relatively high. The chemical composition suggests that the authigenic siderites might have precipitated in a non-marine environment. 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| subjects | Chemical composition Concretions Geology Holocene Manganese Marine environment Radiocarbon dating Radiometric dating Recent sediments Sedimentary structures Sediments Siderite Stratigraphy Tidal flats |
| title | Occurrence of authigenic siderites in the Early Holocene coastal deposit in the west coast of Korea: an indicator of depositional environment |
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