Abstract The 7-km-diameter Jeokjung–Chogye Basin in Hapcheon, southeastern Korean Peninsula, is well-known for its bowl-shaped geomorphology. Here we report the first direct evidence of impact cratering from this basin based our investigations on a 142-m-deep core. The lithological units could be divided into soil-channel sediments (0–6.2 m), lacustrine sediments with fine silt-clayey lamination (6.2–72 m), and impact breccia (72–142 m). We report for the first time, unique impact-driven metamorphic features, including shatter cones at 130 m and planar deformation features (PDFs) in quartz grains from the impact breccia. Based on the radiocarbon dates of charcoals in the lacustrine sediments, we estimate that the impact likely happened during the last glacial period, although further confirmation using other dating techniques is awaited. This relatively young crater provides a rare opportunity to reconstruct high-resolution paleoclimate changes recorded in laminated lacustrine sediments, and to investigate shock metamorphism in a location that experienced significant surficial weathering and erosion under a tropical–temperate climate.

中文翻译：

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朝鲜半岛首次发现撞击坑

摘要 朝鲜半岛东南部咸川县直径 7 公里的 Jeokjung-Chogye 盆地以其碗状地貌而闻名。在这里，我们报告了该盆地撞击坑的第一个直接证据，这是基于我们对 142 米深的岩心的调查。岩性单元可分为土壤河道沉积物（0-6.2 m）、具有细粉砂-粘土层理的湖相沉积物（6.2-72 m）和撞击角砾岩（72-142 m）。我们首次报告了独特的撞击驱动变质特征，包括 130 m 处的破碎锥和来自撞击角砾岩的石英颗粒的平面变形特征 (PDF)。根据湖相沉积物中木炭的放射性碳测年，我们估计影响可能发生在最后一个冰期，但有待使用其他测年技术进一步证实。