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The late Cretaceous volcanic rocks are distributed in the Mt. Jangsan(634 m), Busan, southeast part of Gyeongsang basin, Korea. The felsic volcanic-plutonic sequence can be divided into early rhyolite, rhyolitic ash flow tuff, late rhyolite, granite porphyry and feldspar porphyry in ascending order....

The late Cretaceous volcanic rocks are distributed in the Mt. Jangsan(634 m), Busan, southeast part of Gyeongsang basin, Korea. The felsic volcanic-plutonic sequence can be divided into early rhyolite, rhyolitic ash flow tuff, late rhyolite, granite porphyry and feldspar porphyry in ascending order. Rhyolitic ash flow tuff is caldera-fill deposit and late rhyolite, granite porphyry and feldspar porphyry are ring dike intrusion of the volcanic caldera(Jangsan cauldron). According to the nomenclature for the felsic volcanic rocks based on modal composition, rhyolitic ash flow tuff is vitric tuff and crystal-vitric tuff with welded structure. Phenocrysts of ash-flow tuff consist in quartz, plagioclase, K-feldspar, hornblende and biotite. Emplacement pressure of rhyolitic ash flow tuff using hornblende-geobarometer is divided into two groups, 4.0~5.4 kbar and 1.5~2.6 kbar. The range of equilibrium temperatures of the rhyolitic magma chamber by using plagioclase-hornblende geothermometer are 845℃ and 737℃.

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