한반도 연안 해빈과 하천 모래의 암석기재학적 특성과 연안 퇴적작용에 관한 고찰

This study investigates the petrography of beach and river sands collected along the coastal regions of the Korean Peninsula to compare their compositions. The analysis is framed within the context of contemporary oceanographic and geological conditions, aiming to provide insights into sedimentary processes and provenance. Although sediment sources are likely limited within the drainage basins, river sands are predominantly composed of quartz and K-feldspar, and only minor contributions from locally distinctive geological units were observed. These findings suggest that provenance interpretations based solely on petrography may be misleading in regions with similar geological and tectonic frameworks to the Korean Peninsula. The compositional similarity between Korean beach sediments and Yellow Sea shelf deposits, along with the frequent occurrence of glauconite pellets in beach sands, suggests that contemporary riverine input is not the sole source of beach sediments. Instead, reworked shelf sediments were likely transported landward and incorporated into beach deposits during shoreline retreat associated with recent marine transgression. This interpretation provides a modern example of the influence of relict sediments on beach composition and offers a reference framework for provenance analysis of coastal deposits.