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http://dx.doi.org/10.7854/JPSK.2014.23.2.31

Petrological characteristics of the Yeongdeok granite  

Woo, Hyeon-Dong (Department of Structural Systems and Site Evaluation, Korea Institute of Nuclear Safety)
Jang, Yun-Deuk (Department of Geology, Kyungpook National University)
Publication Information
The Journal of the Petrological Society of Korea / v.23, no.2, 2014 , pp. 31-43 More about this Journal
Abstract
The Yeongdeok granite emplaced in the eastern Yeongyang subbasin is typically a medium- to coarse-grained massive biotite granite. It intruded into Precambrian schist & gneiss complex and is unconformably overlain by Cretaceous sedimentary rocks. In this study, we attempt to investigate the magma type which formed Yeongdeok granite and estimate the emplacement depth using Al-in-hornblende geobarometer to mineral composition. According to the magma fractionation, $TiO_2$, $Al_2O_3$, $Fe_2O_3{^*}$, FeO, $Fe_2O_3$, MnO, MgO, CaO, $Na_2O$ and $P_2O_5$ show positive trend but $K_2O$ indicate negative trend with $SiO_2$ contents. Those are identified as calc-alkaline series in AFM diagram and show the chemical characteristics of the I-type magma through the oxidation tendency of the iron ion and the portion of the alkaline composition. When calculated using the equation of Hollister et al. (1987), the emplacement depths of the Yeongdeok granite range from 8.98 to 17.19 km and average depth was estimated 13.03 km approximately.
Keywords
Emplacement depth; Hornblende geobarometer; I-type; Yeong-Deok granite;
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Times Cited By KSCI : 12  (Citation Analysis)
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