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http://dx.doi.org/10.7854/JPSK.2017.26.3.271

Geochemical Characteristics of A-type granite in Dongcheondong, Gyeongju  

Myeong, Bora (Department of Geology, Kyungpook National University)
Ju, Jiwon (Department of Geology, Kyungpook National University)
Kim, Junghoon (Division of Environment Policy, Gyeongsangbuk-Do)
Jang, Yundeuk (Department of Geology, Kyungpook National University)
Publication Information
The Journal of the Petrological Society of Korea / v.26, no.3, 2017 , pp. 271-280 More about this Journal
Abstract
The Dongcheondong granite is alkali feldspar granite in Dongcheondong, Gyeongju. The granite is coarse grained and consists of alkali feldspar, quartz, amphibole, and biotite. Alkali feldspar is perthitic orthoclase and quartz often shows undulatory extinction. Plagioclase often shows albite twins, and biotite and amphibole emplace as interstitial minerals. The Dongcheondong granite is plotted in A-type area having high ($Na_2O+K_2O)/Al_2O_3$ and low (MgO+CaO)/FeOT ratio. The Dongcheondong A-type granite has higher $SiO_2$, $Na_2O$, $K_2O$, Zr, Y, and REE contents (except for Eu) and lower $TiO_2$, $Al_2O_3$, CaO, MgO, Sr, Ba, and Eu contents than I-type granites in Gyeongsang Basin. These results show that the geochemical characteristics of the Dongcheondong A-type granite are distinguished from I-type granite in Gyeongsang Basin. A-type granite in the Dongcheondong is thought to has been generated by partial melting of I-type tonalite or granodiorite.
Keywords
Alkali-feldspar granite; A-type granite;
Citations & Related Records
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