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http://dx.doi.org/10.5467/JKESS.2008.29.7.539

Geochemistry, Isotope Properties and U-Pb Sphene Age of the Jeongeup Foliated Granite, Korea  

Jeong, Youn-Joong (Korea Basic Science Institute)
Cheong, Chang-Sik (Korea Basic Science Institute)
Park, Cheon-Young (Department of Resource Engineering, Chosun University)
Shin, In-Hyun (Department of Earth Sciences, Chosun University)
Publication Information
Journal of the Korean earth science society / v.29, no.7, 2008 , pp. 539-550 More about this Journal
Abstract
In this paper, we investigate the geochemical and isotope properties of the Jeongeup foliated granite (hereafter, the JFG) in the Jeongeup area, aiming at establishing the movement age of the Honam shear zone by U-Pb sphene geochronology. In the AMF diagram, the JFG corresponds to the calc alkalic rock series, and belongs to the magnesia region in the diagram of silica versus $FeO^{total}/(FeO^{total}+MgO)$. Additionally, in the Rb-Ba-Sr diagram, it is classified as granodiorite and anomalous granite with distinctive negative Eu-anomaly in the REE patterns. According to the silica and trace element contents, the JFG falls on the type VAG+syn-COLG, which implies that this was formed under the circumstance of compressional continental margin or volcanic arc. $^{143}Nd/^{144}Nd$ isotope ratios range from 0.511495 to 0.511783 and $T_{DM}$ are calculated to be about $1.68{\sim}2.36Ga$. U-Pb sphene ages of the JFG are $172.9{\pm}1.7Ma$ and $170.7{\pm}2.8Ma$, based on $^{238}U-^{206}Pb$ and $^{235}U-^{207}Pb$ ages, respectively. Presumably, the dextral ductile shearing in the Jeongeup area has occurred after 173 Ma.
Keywords
Honam shear zone; Jeoneup foliated granite (JFG); model age; U-Pb sphene age;
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