전라남도 화순군의 고생대 석탄기와 중생대 백악기의 지질환경 복원

초록

This study was conducted as part of the mentorship program at the Science Education Institute for Gifted Students, Chonnam National University. Geological fieldwork and laboratory thin-section analyses were carried out on the Carboniferous Oeumri Formation and the Cretaceous Jangdong Tuff, both distributed in Hwasun-gun, Jeollanam-do, to investigate past depositional environments and tectonic settings. Sedimentary facies and depositional structures observed in outcrops suggest that the Oeumri Formation and Jangdong Tuff were mainly deposited in beach and fluvial environments, respectively. The modal compositions of sandstones were plotted on the QFL ternary diagram to elucidate the past tectonic settings. Sandstones from the Oeumri Formation and Jangdong Tuff plot in the recycled orogen field and the dissected arc field on the QFL diagram. Consequently, the geologic environments of the Hwasun region changed from a shallow marine environment with a recycled orogenic tectonic setting at approximately 300 Ma to a fluvial environment near a volcanic arc region around 100 Ma.

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