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http://dx.doi.org/10.22807/KJMP.2020.33.4.339

SHRIMP Zircon U-Pb Ages of Basement Rocks in the Danyang National Geopark  

Cheong, Wonseok (Department of Earth & Environmental Sciences, Chungbuk National University)
Han, Giun (Department of Earth & Environmental Sciences, Chungbuk National University)
Kim, Taehwan (Division of Polar Earth-System Sciences, Korea Polar Research Institute)
Aum, Hyun Woo (Department of Earth & Environmental Sciences, Chungbuk National University)
Kim, Yoonsup (Department of Earth & Environmental Sciences, Chungbuk National University)
Publication Information
Korean Journal of Mineralogy and Petrology / v.33, no.4, 2020 , pp. 339-347 More about this Journal
Abstract
We carried out the U-Pb age dating of zircon from basement rocks in the southern part of the Danyang National Geopark. Two migmatitic gneisses composed of biotite±sillimanite±garnet+feldspar+quartz were dated. Leucosomes in the samples were clearly distinguished from their melanosomes. The U-Pb isotopic compositions of zircon from sillimanite- and garnet-bearing migmatitic samples were measured using a secondary ion microprobe, yielding metamorphic ages, 1870±10 Ma (2σ)와 1863±6 Ma (2σ), respectively. 1.87~1.86 Ga metamorphic ages are consistent with those of the Paleoproterozoic low-P and high-T regional metamorphism (1.87~1.85 Ga) in the Yeongnam Massif. The maximum depositional age based upon the apparent 207Pb/206Pb ages of detrital zircon in the samples was estimated as 2.06 Ga, and thus sedimentation age of the protolith of the migmatitic gneisses ranges between 2.06 and 1.87 Ga.
Keywords
Danyang National Geopark; Yeongnam Massif; migmatitic gneiss; zircon; U-Pb age;
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