FIRST FINDING OF IMPACT CRATERING FROM THE JEOKJUNG-CHOGYE BASIN ON THE KOREAN PENINSULA |
This year, based our investigations of a 142 m-deep core, we reported for the first time that the Jeokjung–Chogye Basin in the southeastern Korean Peninsula, well-known for its bowl-shaped geomorphology, was formed by an impact event. To confirm an impact origin, the presence of unique impact-driven metamorphic features is required. We found unique impact-driven metamorphic features, including shatter cones at 130 m and planar deformation features (PDFs) in quartz grains from the impact breccia. The Jeokjung–Chogye Basin, with its signs of impact metamorphic effects, provides a rare chance to understand shock metamorphism in a location where the tropical–temperate climate has caused significant surface weathering and erosion. The preserved subsurface laminated lacustrine sediments serve as a rare archive of high-resolution paleoclimate changes in Korea.
Contact: Jaesoo Lim (limjs@kigam.re.kr)
Fig. 1. Impact event on 142m deep core in the Jeokjung-Chogye Basin (Lim et al., 2021).