Journal of the Korean earth science society (한국지구과학회지)

The Korean Earth Science Society (한국지구과학회)
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Detrital zircon U-Pb ages of the uppermost Jinju Formation in the Natural Monument No. 534 'Tracksite of Pterosaurs, Birds, and Dinosaurs in Hotandong, Jinju', Korea

  • Chae, Yong-Un (Department of Geological Sciences, Pusan National University) ;
  • Lim, Jong Deock (National Research Institute of Cultural Heritage) ;
  • Kim, Cheong-Bin (Department of Physics Education, Sunchon National University) ;
  • Kim, Kyung Soo (Department of Science Education, Chinju National University of Education) ;
  • Ha, Sujin (Department of Geological Sciences, Pusan National University) ;
  • Lim, Hyoun Soo (Department of Geological Sciences, Pusan National University)
  • Received : 2020.08.13
  • Accepted : 2020.08.26
  • Published : 2020.08.31
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Abstract

LA-MC-ICP-MS zircon U-Pb dating was conducted to constrain the timing of fossil formation and the depositional age of the uppermost Jinju Formation located in Natural Monument No. 534 (Tracksite of Pterosaurs, Birds, and Dinosaurs in Hotandong, Jinju), and 87 Cretaceous, 1 Precambrian, and 2 Jurassic zircons were obtained from 90 valid analytical points. Most Cretaceous zircons were found to have a youngest graphical peak age of ca. 106.5 Ma, suggesting the depositional age of the uppermost Jinju Formation. Based on this study and previous works, the average sedimentation rate of the Jinju Formation was calculated to be approximately 0.17-0.31 mm/year in the Milyang Subbasin, and the Cretaceous zircons of the uppermost Jinju Formation seem to have originated mainly from the western or northwestern parts of the Gyeonggi Massif. Unlike the Nakdong and Hasandong formations of the Sindong Group, most zircons analyzed in the uppermost Jinju Formation were Cretaceous. This suggests that volcanic activity occurred in the area closer to the Gyeongsang Basin due to the roll-back of subducting paleo-Pacific Plates during the Jinju period.

Keywords

References

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