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Earth, Planets and Space
Fig. 3 | Earth, Planets and Space

Fig. 3

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

Fig. 3

Petrographic images of the Cretaceous Mudeungsan Tuff (quartz-bearing andesitic-dacitic tuff) of Mt. Mudeung. a–b Thin section of slightly welded textures of the Mudeungsan Tuff with quartz and plagioclase phenocrysts in a matrix of welded glass shards in plain and cross-polar light, respectively. c–d Zoned plagioclase phenocrysts have albite twins and quartz is fine-grained and found in the groundmass. Pl plagioclase, Q quartz, kfs K-feldspar (sanidine), and CPX clinopyroxene

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