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http://dx.doi.org/10.5467/JKESS.2022.43.5.618

Granite Dike Swarm and U-Pb Ages in the Ueumdo, Hwaseong City, Korea  

Chae, Yong-Un (Department of Geological Sciences, Pusan National University)
Kang, Hee-Cheol (Department of Geological Sciences, Pusan National University)
Kim, Jong-Sun (Korea National Park Research Institute, Korea National Park Service)
Park, Jeong-Woong (Soong-Moon High School)
Ha, Sujin (Department of Geological Sciences, Pusan National University)
Lim, Hyoun Soo (Department of Geological Sciences, Pusan National University)
Shin, Seungwon (Department of Geology, Kangwon National University)
Kim, Hyeong Soo (Department of Earth and Environmental Sciences, Korea University)
Publication Information
Journal of the Korean earth science society / v.43, no.5, 2022 , pp. 618-638 More about this Journal
Abstract
The Middle Jurassic granite dike swarm intruding into the Paleoproterozoic banded gneiss is pervasively observed in Ueumdo, Hwaseong City, mid-western Gyeonggi Massif. Based on their cross-cutting relationships in a representative outcrop, there are four dikes (UE-A, UE-C, UE-D, UE-E), and depending on the direction, there are three granite dike groups, which are NW- (UE-A dike), NW to WNW- (UE-C dike), and NE-trending (UE-D and UE-E dikes). These granite dikes are massive, medium-to coarse-grained biotite granites, and their relative ages observed in outcrops are in the order of UE-A, UE-D (=UE-E), and UE-C. The geometric analysis of the dikes indicates that the UE-A and UE-C dikes intrude under approximately NE-SW trending horizontal minimum stress fields. The UE-A dike, which showed a relatively low average SiO2 content by major element analysis, is a product of early magma differentiation compared to other dikes; therefore, it is consistent with the relative age of each dike. The 206Pb/238U weighted mean ages for each dike obtained from SHRIMP zircon U-Pb dating were calculated to be 167 Ma (UE-A), 164 Ma (UE-C), 167 Ma (UE-D), and 167 Ma (UE-E), respectively. The samples of the UE-A, UE-D, and UE-E dikes showed very similar ages. The UE-C dike shows the youngest age, which is consistent with the results of the relative age in the outcrops and major element analysis. Therefore, the granite dikes intruded into the Middle Jurassic (approximately 167 and 164 Ma), coinciding with those of the Gyeonggi Massif, where the Middle Jurassic plutons are geographically widely distributed. This result indicates that the wide occurrence of the Middle Jurassic plutons on the Gyeonggi Massif was formed as a result of igneous activity moving in the northwest direction with the shallower subduction angle of the subducting oceanic plate during the Jurassic.
Keywords
Ueumdo; granite dike swarm; cross-cutting relationship; Middle Jurassic; subduction angle;
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