Fig. 1. Geologic map of the Mt. Baekdu volcanic field (Modified after Lee, 1991).
Fig. 2. Photograph of the outcrop showing columnar jointing (upper) and porphyritic texture with phenocrysts of plagioclase (lower right; basaltic trachyandesite(B-1), lower left; trachybasalt(B-2)).
Fig. 3. Photomicrograph showing porphyritic texture with phenocrysts of plagioclase in the cryptocrystalline (upper; B-1) and intersertal (lower; B-2) groundmass. Width of photo is about 6 mm. Crossed nicols. Pl; plagioclase, Px; pyroxene.
Fig. 5. Pyroxene compositions for Changbai trachybasalt (B-2) and Wangtian'e basaltic trachyandesite (B-1) in the system of CaSiO3-MgSiO3-FeSiO3 (Morimoto, 1988).
Fig. 6. Olivine compositions for Changbai trachybasalt (B-2)(Deer et al., 1972).
Fig. 4. An-Ab-Or diagram showing feldspar compositions for Changbai trachybasalt (B-2) and Wangtian’e basaltic trachyandesite (B-1) (Deer et al., 1972).
Table 1. Representative major element analysis (wt%) of feldspars and pyroxene of Wangtien’e basaltic trachyandesite
Table 2. Representative major element analysis (wt%) of feldspars, pyroxene and olivine of the Changbai trachybasalt.
Table 3. Calculated crystallization temperature of olivine, clinopyroxene, and plagioclase of Changbai trachybasalt (B-2) and Wangtian’e basaltic trachyandesite (B-1).
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