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한국지구과학회
The Korean Earth Science Society

pISSN : 1225-6692  |  eISSN : 2287-4518



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kess64, vol. 41, no. 4, pp.367-380, August, 2020

DOI. https://doi.org/10.5467/JKESS.2020.41.4.367

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

Yong-Un Chae1, Jong Deock Lim2, Cheong-Bin Kim3, Kyung Soo Kim4, Sujin Ha1 , Hyoun Soo Lim1,*
1 Department of Geological Sciences, Pusan National University, Busan 46241, Korea 2 National Research Institute of Cultural Heritage, Daejeon 34122, Korea 3 Department of Physics Education, Sunchon National University, Suncheon 57922, Korea 4 Department of Science Education, Chinju National University of Education, Jinju 52673, Korea

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.

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