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• W2534477855 abstract "Jeju Island which belongs to the Circum Japan Sea Alkali Rock Province is situated at about 90km the southern of Korean Peninsula. Its shape is an ellipe with size of 80×40km2, and it is characterized by symmetrical form whose peak is Mt. Halla (1950m). It is shield volcano formed by central eruptions, neighborhood of Mt. Halla may be acted as eruption centers, during Upper Pliocene to Lower Pleistocene age, and they have erupted in historic time. Landform of this island can be divided into lava plateau, shield shaped Halla volcanic edifice and parasitic scoria cones more than 360, accoring to topographically. It is composed chiefly of voluminous, thick basaltic lava piles, and accompanied with less abundant pyroclastic rocks. Hyaloclastite also occurs in small amount on coastal line. Volcanism of this island can be classified into 4 stages, which are further subdivided into 19 stratigraphic units. The stage 1 began with eruption of basaltic lava which contains olivine phenocryst and formed basement as a plateau from the marine floor to sea level. Pyroclastic sedimentary rocks composed of an alternation of shale, tuffaceous sandstone and fossil-shell are intercalated between stages 1 and 2. The stage 2 commenced with eruption of basaltic lava distributed as forming a lava plateau, which is the most abundant in volume. It is similar petrographically to basaltic lava of the stage 1. During this stage, lavas change from basalt through trachyandesite to trachyte with decreasing its volume. Pyroclastic sedimentary rock contained fossil-shell is exposed between the stages 2 and 3. The stage 3 formed shield shaped Halla volcanic edifice whose peak is about 2000m in height, and finally maked Backlockdam crater (400m in diameter) which is petrographically built up of two walls: basaltic and trachytic lavas. During this stage, lavas change from basalt to trachyandesite or to trachyte with decreasing its volume, repeatedly. Therefore, this stage can be further divided into 3 substages. The lava flows are characterized by plaigoclase and clinopyroxene phyric. The stage 4, final activity, produces more than 360 parasitic scoria cones which mostly distributed on the vicinity of long axis of this island, most of which consist of pyroclastic material but rarely do basaltic and tracyandesitic lava flows." @default.
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• W2534477855 date "1982-01-01" @default.
• W2534477855 modified "2023-09-25" @default.
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• W2534477855 doi "https://doi.org/10.2465/ganko1941.77.55" @default.
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