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http://dx.doi.org/10.5467/JKESS.2021.42.1.11

Detrital zircon U-Pb ages of the Cretaceous Iljik, Jeomgok, and Sagok formations in the Cheongsong Global Geopark, Korea: Depositional age and Provenance  

Chae, Yong-Un (Department of Geological Sciences, Pusan National University)
Choi, Taejin (Department of Advanced Energy Engineering, Chosun University)
Paik, In Sung (Department of Earth and Environment Sciences, Pukyong National University)
Kim, Jong-Sun (Korea National Park Research Institute, Korea National Park Service)
Kim, Hyun Joo (Department of Earth and Environment Sciences, Pukyong National University)
Jeong, Hoon Young (Department of Geological Sciences, Pusan National University)
Lim, Hyoun Soo (Department of Geological Sciences, Pusan National University)
Publication Information
Journal of the Korean earth science society / v.42, no.1, 2021 , pp. 11-38 More about this Journal
Abstract
Detrital zircon U-Pb dating of samples from the Baekseoktan (Iljik Formation), Mananjaam (Jeomgok Formation), and Sinseongri (Sagok Formation) geosites in the Cheongsong Global Geopark were carried out to estimate the depositional age and provenance of the Hayang Group in the Gyeongsang Basin. In the Iljik Formation, Jurassic and Triassic zircons are dominant with minor Precambrian zircons, with no Cretaceous zircon. In contrast, the Jeomgok and Sagok formations show very similar age distributions, which have major age populations of Cretaceous, Jurassic, and Paleoproterozoic ages. The weighted mean ages of the youngest zircon age groups of the Jeomgok and Sagok formations are 103.2±0.3 and 104.2±0.5 Ma, respectively. Results suggest that the depositional ages of the Jeomgok and Sagok Formations are Albian. The detrital zircon age spectra indicate a significant change in provenance between the Iljik and Jeomgok formations. The sediments of the Iljik Formation are thought to have been supplied from nearby plutonic rocks. However, the Jeomgok and Sagok sediments are interpreted to have been derived from relatively young deposits of the Jurassic accretionary complex located in southwest Japan.
Keywords
Iljik Formation; Jeomgok Formation; Sagok Formation; U-Pb dating; provenance;
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