Sedimentary Facies and Paleoenvironment of the Lower Pleistocene Sogwipo Formation, Cheju Island, Korea.

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  • Kang Soon-Seok
    Graduate School of Science and Technology, Niigata University Present Address: Department of Oceanography, Cheju National University

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Other Title
  • 韓国済州島,下部更新統西帰浦層の堆積相と古環境
  • 韓国済州島,下部更新統西帰浦層の堆積相と古環境〔英文〕
  • カンコク サイシュウトウ カブ コウシントウ ソギポソウ ノ タイセキソウ ト

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Abstract

The Sogwipo Formation is distributed along the southern coast of Cheju Island, Korea, and is covered by Middle Pleistocene volcanic lava flows. These sediments are composed of mainly light grey fine to medium sandstones, muddy sandstones, mudstones, volcanic ashes and volcanic clasts with characteristic shell beds and trace fossils. This formation contains the molluscan fossils of the Omma-Manganzian fauna.<br>The deposits can be divided into eleven sedimentary facies associations which are made in a grouping of nine sedimentary lithofacies and six sedimentary biofacies. On the basis of facies analysis, it is determined that all sedimentary facies associations were deposited at the inner shelf to foreshore and bay environments and that they were formed in a open sea to bay fluctuation system, controlled by glacio-eustatic sea level change.<br>The depositional process of the Sogwipo Formation is summarized on transgression, gradual regression and transgression stages with a ravinement surface ascendant upwards. The transgression stage mainly consists of massive shoreface sands within a channelized compact shell bed. The gradual regression stage showed change from a open shelf to a beach system gradually, while the transgression stage with transgressive conglomerate is indicated in shoreface to bay system produced by geographic changes of the sedimentary basin as the shoreline retreated during the transgression. It consists of lower shoreface shell beds and tuffaceous siltstone. The uppermost bay sediment suggests that the sedimentary basin was buried in rapid sedimentation by strong volcanic activity.<br>It is interpreted that the Sogwipo Formation has been developed by shallow marine environment on the paleo-Cheju volcano and produced two sedimentary stratigraphic cycles reflecting to the fifth order cyclic eustasy.

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