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http://dx.doi.org/10.5467/JKESS.2022.43.3.405

Detrital Zircon U-Pb Ages of the Cretaceous Gurye Group, Gurye Basin, Korea: Implications for the Depositional Age and Provenance  

Kim, Youhee (Department of Geological Sciences, Pusan National University)
Chae, Yong-Un (Department of Geological Sciences, Pusan National University)
Ha, Sujin (Department of Geological Sciences, Pusan National University)
Choi, Taejin (Department of Earth Science Education, Korean National University of Education)
Lim, Hyoun Soo (Department of Geological Sciences, Pusan National University)
Publication Information
Journal of the Korean earth science society / v.43, no.3, 2022 , pp. 405-429 More about this Journal
Abstract
Detrital zircon LA-MC-ICP-MS U-Pb dating of the Cretaceous Gurye Group, Gurye Basin, was carried out. Gurye Group consists of Supyeongri, Geumjeongri, Togeum, and Obongsan formations in ascending order, and five samples were collected for age dating. Based on the dating results, the lowermost Supyeongri and the uppermost Obongsan formations show narrow age ranges. Only Precambrian and Late Cretaceous zircons were found in the Supyeongri and Obongsan formations, respectively. However, the upper and lower Geumjeongri, and Togeum formations show wide age ranges from the Precambrian to Cretaceous. The youngest detrital zircon U-Pb ages of each formation except the Supyeongri Formation, which lacks Cretaceous zircon, were calculated to be ca. 107.4 Ma in the lower Geumjeongri Formation, ca. 104.6 Ma in the upper Geumjeongri Formation, ca. 97.7 Ma in the Togeum Formation, and ca. 88.5 Ma in the Obongsan Formation. Such results indicate that the depositional age of the Gurye Group can be constrained from the Lower Cretaceous Albian to the Upper Cretaceous Coniacian. Based on the distribution of the detrital zircon ages from each formation, the source area of the Gurye Group is interpreted to have been extended from the adjacent Youngnam Massif to the Okcheon Belt throughout the basin evolution. The increase of the Cretaceous zircon with time is thought to reflect the slab roll-back of the proto-Pacific plate during the Cretaceous.
Keywords
Gurye Basin; Gurye Group; detrital zircon U-Pb dating; Cretaceous; provenance;
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