Title: A Study on the Marine Depositional Environment of Pohang to Ulsan
Abstract: Submarine depositional environment on the southwestern area of the East Sea was studied by the sedimentological and micropaleontological analyses of seven surface and eight core samples from the Pohang to Ulsan coastal areas. The surface sedimentary fades are classified into clay, mud, clayey sand, muddy sand, sand, slightly gravelly muddy sand. The sediments are coarsening toward the outer shelf in the southeastern part of the study area. The core sediments are mainly consisted of thinly-laminated mud and bioturbated mud fades. Seventeen silicoflagellate species belonging to five genera are identified from the study area. The silicoflagellate assmblages include two varieties and a forma. From the silicoflagellate assemblage and sedimentological results, it is considered that the study area is mainly influenced by the warm Tsushima Current with a weaker cold water mass under active reworking and redeposition of the sediments, and the sediments having a primarily terrigenous origin in the study area were transported.by several sedimentary mechnisms as turbidites, winnowing and suspension associated with the postglacial sea level uprise. In addition, the coarse sediments in the study area is relict ones in glacial age.
Publication Year: 1997
Publication Date: 1997-01-01
Language: en
Type: article
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