Abstract
The Late Carboniferous Manhang Formation is distributed in Samchok (Samcheog), Tanyang (Danyang), Chongson (Jeongseon), Kangnung (Gangreung), and Munkyong (Mungyeong) coalfields. The chemical compositions of the Manhang Formation sandstones were analyzed to infer the original sediment composition and tectonic setting of provenance. Sandstones in the five coalfields have similar chemical compositions suggesting a common provenance. On the basis of Al2O3 content, two groups of sandstones are differentiated: high alumina and low alumina groups. The former occurs in the Samchok and Tanyang coalfields; the latter in the Chongson and Kangnung coalfields. The absence of detrital alkali feldspar in the Manhang sandstones is evidenced by very low Na2O content. The geochemical characteristics support the petrographic results of Lee and Lim (1995). Normative mineralogy and discriminant function analysis indicate that the Manhang sandstones were derived from the quartzose sedimentary provenance in a recycled orogenic setting. Also, a passive continental margin tectonic setting is suggested by the K2O/Na2O−SiO2 discrimination diagram; however, such a setting is more applicable to the previous cycle before orogeny.
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Lee, Y.I. Geochemical characteristics of the Manhang Formation (Late Carboniferous) sandstones, Korea: implication for provenance. Geosci J 3, 87–94 (1999). https://doi.org/10.1007/BF02914264
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DOI: https://doi.org/10.1007/BF02914264