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Choi, Yire,Kim, Kyeong Ja,Cheong, Daekyo,Kim, Yong Ha UNIVERSITY OF ARIZONA 2014 RADIOCARBON Vol.56 No.3
<P>The paleoclimatic signal of Lake Hovsgol in Mongolia was investigated using authigenic beryllium isotopes from 20 sediment samples. The beryllium isotopic records from this study indicate that there were three dry and cold periods at the lake around 9400, 12,700, and 17,100 cal yr BP. The significant <SUP>10</SUP>Be signal during the Younger Dryas (YD) period is found to be lower. This indicates that the Lake Hovsgol area was subject to a period of cold and dry conditions with minimal dust input, which manifests itself as a low <SUP>9</SUP>Be profile in this study. In warmer and wetter climatic conditions, the <SUP>10</SUP>Be concentration was found to be higher, and this agrees with the sedimentation record of this study. The climatic signals from Lake Hovsgol appear to be similar to a decreased beryllium record during the deglacial period. The results of this study confirm that the Lake Hovsgol area also experienced the global paleoclimatic change associated with the YD event around 12,700 cal yr BP. Further investigation using worldwide lake records by the analytical technique of authigenic beryllium will be useful for understanding the global paleoclimatic change pattern in conjunction with lake-level change.</P>
Hoil Lee,Jin-Hyuck Choi,Yire Choi,Tae-Ho Lee,Keun-Soo Lee 대한지질학회 2021 대한지질학회 학술대회 Vol.2021 No.10
The area around the ancient capital city of Gyeongju is one of the most tectonically active regions on the Korea, as demonstrated by instrumental and historical earthquake records. However, the numerous cultural heritage sites in and around Gyeongju mean that there are many restrictions on work that could verify the geological records of significant paleo-earthquakes. To overcome these restrictions, we conducted a paleoseismological study in the cultural heritage protection zones of Gyeongju to investigate the history of earthquakes along the Yangsan Fault. We mapped geomorphic and geological expressions of the fault, and we used non- or less-destructive investigative measures such as geophysical surveying and drilling. To constrain the timing of the surface deformation, Optically-Stimulated Luminescence (OSL) and 10Beryllium cosmogenic exposure age dating method are applied. Our results imply that the fault scarps expressed on the alluvial fan formed after 81 ka with a vertical offset-rate of >0.028 m/ka. Our study shows that near-surface geophysical and drilling survey, supplemented by dating, can play an important role in tracing active faults in areas where paleo-seismological excavation investigation is impossible due to protection of cultural properties.