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Earth, Planets and Space
Fig. 5 | Earth, Planets and Space

Fig. 5

From: Genesis of the columnar joints from welded tuff in Mount Mudeung National Geopark, Republic of Korea

Fig. 5

AFM diagram showing whole-rock composition in terms of Na2O + K2O, total iron as FeO and MgO. Rock samples were collected at the Ipseok-dae (unfilled triangles), Seoseok-dae (unfilled diamonds), Gwangseok-dae (unfilled circles), and Chotdae-bong (unfilled rectangles) colonnades. The dotted line indicates the boundary between calc-alkaline and tholeiitic series derived by Irvine and Baragar (1971). The trend of analyses of samples from Mt. Mudeung is a representative of calc-alkaline arc volcanos

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