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http://dx.doi.org/10.7854/JPSK.2017.26.4.327

Geochemical Studies on Petrogenesis of the Cretaceous Myeongseongsan Granite in the Northwestern Gyeonggi Massif  

Yi, Eun Ji (Department of Geology, Kangwon National University)
Park, Ha Eun (Department of Geology, Kangwon National University)
Park, Young-Rok (Department of Geology, Kangwon National University)
Publication Information
The Journal of the Petrological Society of Korea / v.26, no.4, 2017 , pp. 327-339 More about this Journal
Abstract
The Cretaceous Myeongseongsan Granite in the northwestern Gyeonggi Massif consists of a major pale pink-colored biotite monzogranite and a minor white-colored biotite alkaligranite. Low Sr and high Ba concentrations, negative Eu-anomalies in REE plot, negative Sr anomalies in spider diagram, a negative correlation between Sr and Rb, and positive correlations between Sr and Ba and $Eu/Eu^*$ indicate that a fractional crystallization of both plagioclase and K-feldspar played a significant role during magma evolution. The Myeongseongsan Granite is plotted in I-& S-type granites on I, S, A-type granite classification scheme. While the biotite monzogranite is plotted in unfractionated I-& S-type granite, the biotite alkaligranite is plotted in fractionated I-& S-type granite, which indicates that the biotite alkaligranite is a more differentiated product. In order to elucidate the nature of the protoliths of the peraluminous Myeongseongsan magma, we plotted in $Al_2O_3/TiO_2$ vs. $CaO/Na_2O$ and Rb/Sr vs. Rb/Ba diagrams, and they suggest that the Myeongseongsan Granite was derived from clay-poor metagreywackes and meta-psammites or their igneous counterparts. Whole-rock zircon saturation temperature indicates that the Myeongseongsan magma was melted at $740-799^{\circ}C$.
Keywords
Myeongseongsan Granite; Cretaceous; Fractional Crystallization; Protolith;
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