와편모조류 화석을 이용한 동해의 생층서 연구
Biostratigraphic analysis of the East Sea, using dinoflagellates
와편모조류화석 동해 생층서;
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Core samples from DolgoraeII, located at the Cenozoic Ulleung Basin, East Sea, were analyzed for dinoflagellate study. A total of 81 permanent slides were obtained from every 30m interval of 820-3220m DolgoraeII core. A majority of the dinoflagellate microfossils were recovered from interval of 820-1600m, showing a high species abundance and diversity. In contrast, only a few dinoflagellate microfossils were detected below the depth of 1600m, and species diversity and abundance are also low as compared with the upper interval. Dinoflagellate microfossils containing characteristic morphologies were analyzed and classified into 29 species, from which geologic age, paleoenvironment, and paleoclimate of the Ulleung Basin were investigated. The geologic age when DolgoraeII were deposited at the margin of the Ulleung Basin was roughly estimated as the Mddle Miocene to the Pleistocene. Warm climate was dominant during the early Middle Miocene because of the warm current, while the interval of 1600-820m seems to have been experienced the mixture of warm and cold current, resulting in a paleoenvironmental change from the warm to moderate climate. At the interval of 3220-1450m oceanic dinoflagellates were dominant, while a mixed assemblage including both neritic and oceanic dinoflagellates were obtained from the interval of 1450-820m. It is, therefore, concluded that the Dolgorae II (3220-1450m) were initially deposited at the deep sea area, changing into a shallow and neritic environment in the course of the Ulleung Basin development.
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