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Clay minerals from tidal flat sediments at Youngjong Island, Korea, as a potential indicator of sea-level change

Published online by Cambridge University Press:  09 July 2018

J. -W. Moon*
Affiliation:
Department of Earth System Sciences, Yonsei University, 134 Shinchon-dong, Seodaemun-ku, Seoul 120-749, Korea
Y. Song
Affiliation:
Department of Earth System Sciences, Yonsei University, 134 Shinchon-dong, Seodaemun-ku, Seoul 120-749, Korea
H. - S. Moon
Affiliation:
Department of Earth System Sciences, Yonsei University, 134 Shinchon-dong, Seodaemun-ku, Seoul 120-749, Korea
G. H. Lee
Affiliation:
Department of Earth System Sciences, Yonsei University, 134 Shinchon-dong, Seodaemun-ku, Seoul 120-749, Korea

Abstract

Clay minerals from the tidal flat sediments along the coast of Youngjong Island, west of mainland Korea, were studied to ascertain their potential as an indicator of sea-level fluctuation. Semi-quantitative analysis of their clay-size fractions by XRD shows that the vertical distribution of clay minerals can be separated into four clay mineral assemblage units. Based on the relative contents of chlorite, four sedimentary units are distinguishable, and the abundance of chlorite is inversely related to that of smectite. The kaolinite content is constant, and so it is clear that chlorite originating from the Han River was transformed to smectite by pedogenesis during regression periods. Therefore, the relative contents of clay minerals from the unconsolidated materials in the tidal flat of Youngjong Island canbe used as indicators of transgression and regression in accordance with the sea-level fluctuation.

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2000

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