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http://dx.doi.org/10.7854/JPSK.2019.28.4.237

SHRIMP U-Pb Zircon Dating and Volcanic Process of the Volcanic Rocks around the Jayang Caldera, Northern Yeongcheon, Korea  

Hwang, Sang Koo (Department of Earth and Environmental Sciences, Andong National University)
Jo, In Hwa (Korea Basic Science Institute)
Son, Yong Seok (Department of Earth and Environmental Sciences, Andong National University)
Song, Kyo-Young (Korea Institute of Korea Institute of Geoscience and Mineral Resources)
Yi, Keewook (Korea Basic Science Institute)
Publication Information
The Journal of the Petrological Society of Korea / v.28, no.4, 2019 , pp. 237-249 More about this Journal
Abstract
The volcanic rocks around the Jayang caldera are classified in an order such as Jukjang Volcanics, Doil Rhyolite, Unjusan Tuff and Rhyolite intrusions. By the SHRIMP U-Pb zircon datings from zircons, eruption ages of the Unjusan Tuff are constrained as 66.65±0.96 Ma in the intracaldera, and 66.08±0.62 Ma in the extracaldera outflow, and intrusion age of the ring dike is investigated as 60.74±0.66 Ma. The age data indicate that the caldera was collapsed between 66.08 Ma and 60.74 Ma, just before the dike intruded after the explosive eruption of the Unjusan Tuff. The Jayang caldera shows the composite igneous process of a perfect volcanic cycle passing from ash-flow tuffs through caldera collapse into ring dikes in the Jayang area.
Keywords
Unjusan Tuff; Ring dike; SHRIMP U-Pb dating; Jayang caldera; Volcanic process;
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