Abstract
Coastal dunefields along the east coast of Korea have long been thought to have originated from beach ridges that prograded during the Holocene, but there has been little chronological evidence based on absolute dating. In this paper, we use optically stimulated luminescence (OSL) dating and ground-penetrating radar (GPR) surveys to reconstruct the coastal progradation of Anin dunefield in the Gangneung area on the east coast of Korea. GPR profiles and sedimentological analyses of four beach-foredune ridges reveal that the ridges are composed mainly of beach deposits showing seaward-dipping and horizontal laminae, capped by eolian sands with landward-dipping laminae. The beach deposits are, in places, underlain by fluvial sands with gravels. Coupled with data from OSL dating, we interpret these results to mean that the fluvial sands and rounded cobbles were deposited in the study area, during the last glacial period. Between the mid-Holocene (~6.5 kyr) and
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