Abstract
The present study was focused on red sandston beds occurring in the Chilgok Formation, lower Hayang Group of Cretaceous age. Red sandstones consist mainly of plagioclase, quartz, and volcanic rock fragment, with accessory minerals such as biotite, chlorite, pyroxene, hornblende, leucoxene, ilmenite, sphene, pyrite, and hematite. Volcanic rock fragments composed of pyroxene, plagioclase, and glass material are intensively altered. Reddening of sandstones was preferentially attributed to the presence of hematite, Fe- and Ti-bearing minerals. Hematite pigmentation was largely caused by post-depositional dissolution of Fe-silicates such as chlorite, biotite, and amphibole. Diagnostic alteration of mafic minerals as well as Ti-bearing minerals, together with clay minerals, indicates that pigmentary materials in the red beds inherited from diagenetic sources in the depositional basin, possibly during early diagenesis.
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Choo, C.O., Shin, Y.S. & Koh, I.S. Mineralogical evidence for red coloration of sandstones at the Chilgok Formation of the Cretaceous Hayang Group, Southeastern Korea. Geosci J 6, 141–148 (2002). https://doi.org/10.1007/BF03028285
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DOI: https://doi.org/10.1007/BF03028285