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http://dx.doi.org/10.7854/JPSK.2014.23.3.209

SHRIMP U-Pb Zircon Ages of the Yeongju and Andong Granites, Korea and their Implications  

Yoon, Rina (Division of Earth Environmental System, Pukyong National University)
Song, Yong-Sun (Department of Earth Environmental Sciences, Pukyong National University)
Yi, Keewook (Division of Earth and Environmental Science, Korea Basic Science Institute)
Publication Information
The Journal of the Petrological Society of Korea / v.23, no.3, 2014 , pp. 209-220 More about this Journal
Abstract
SHRIMP zircon U-Pb age dating is carried out for the Yeongju and Andong granite batholiths intruding the Precambrian metamorphic complex and Paleozoic sedimentary formations within the NE Yeongnam Massif, Korea. Dating of zircons from a hornblende-biotite tonalite and an equigranular biotite granodiorite in the Yeongju granite has yielded ages of ca. 187 Ma and ca. 186 Ma, respectively. Also, dating of zircons from a biotite granodiorite and a very coarse-grained biotite granite in the Andong granite has yielded ages of ca. 182Ma and ca. 186Ma, respectively. These data indicate that the main intrusions of the Yeongju and Andong granite batholiths occur almost at the same age. The oldest age of ca. 194 Ma has been determined on zircons from a hornblende gabbro in the Andong granite, and the youngest age of 175 Ma is obtained from the Chunyang granite pluton, mainly consisting of fine-grained two-mica granite, of the Yeongju batholith. These results indicate that Jurassic Daebo magmatism in the Yeongju-Andong area, NE Yeongnam massif, started early at the Early Jurassic with an intrusion of mafic magma, and followed by an emplacement voluminous granite magma during the middle of the Early Jurassic, and was finalized with the emplacement of relatively small amount of much evolved granite magma at the end of Early Jurassic.
Keywords
Yeongju granite; Andong granite; SHRIMP; zircon; U-Pb age; Yeongnam massif;
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Times Cited By KSCI : 8  (Citation Analysis)
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