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Petrology of the Cretaceous Volcanic Rocks in the Gyemyeong peak and Janggun peak area, Mt. Geumjeung, Busan  

Kim, Hye-Sook (Department of Geological Sciences, Pusan National University)
Kim, Jin-Seop (Department of Geological Sciences, Pusan National University)
Moon, Ki-Hoon (Department of Geological Sciences, Pusan National University)
Publication Information
The Journal of the Petrological Society of Korea / v.18, no.1, 2009 , pp. 1-17 More about this Journal
Abstract
This article carried studies of the petrographical and petrochemical characteristics on the Cretaceous volcanic rocks in the area of Janggun peak and Gyemyeong peak which is located at the northeastern area of Mt. Geumjeong, Busan. The areas are composed of andesitic rock, sedimentary rock, rhyolitic rock, and intrusive hornblende, biotite granites, in ascending order. According to petrochemistry, the major elements show the calc-alkaline rock series ranged medium-K to high-K. With increasing $SiO_2$, $Al_{2}O_{3}$, $Fe_{2}O_{3}$, $TiO_2$ CaO, MgO MnO and $P_{2}O_{5}$ are decreased and $K_{2}O$ and $Na_{2}O$ are increased in the volcanic rocks. The trace element compositions show high LILE/HFSE ratios and negative anomaly of Nb, and REE patterns show enrichments in LREE and (-) anomaly values increase of Eu from the basaltic andesite to andesite facies, therefore the volcanic rocks have typical characteristics of continental margin arc calc-alkaline volcanic rocks, produced in the subduction environment. The volcanic rock show nearly the same patterns in spider and REE diagram. Fractional crystallization of the basaltic magma would have produced the calc-alkaline andesitic magma. And the rhyolitic magma seems to have been evolved from the basaltic andesitic magma with fractional crystallization of plagioclase, pyroxene, hornblende, biotite.
Keywords
Janggun peak; Gyemyeong peak; fractional crystallization; calc-alkaline rock series;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
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