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Petrological and mineralogical characteristics of the rocks constituting the Sungryemun (South Gate)  

박찬수 (한국기초과학지원연구원 서울분소)
이상헌 (강원대학교 자연과학대학 지질학과)
Publication Information
The Journal of the Petrological Society of Korea / v.12, no.4, 2003 , pp. 196-206 More about this Journal
Abstract
The geochemical and mineralogical investigation on the rocks and repair material comprising of the Sungryemun (The 1st National Treasure) has been made. Rock of the Sungryemun is highly weathered coarse-grained calc-alkali granite. The rock consists mainly of quartz, perthite, plagioclase and biotite with small amounts of orthoclase, muscovite, chlorite and sericite, which are major weathering products from perthite. For obtaining informations about degree of weathering, mineral composition of the original rock calculated by CIPW norm and weathered rock composition determined by XRD quantitative analysis were plotted on a ternary diagram of quartz-potash feldspar-plagioclase. Original rock compositions are plotted on the central granite area. whereas weathered ones are plotted on the granite area close to quartz. The result means that quartz is more abundant in weathered rock, due to selective chemical weathering of potash feldspar and plagioclase over quartz. On the whole, surface of the rocks were black-coated, exfoliated and highly fractured due to the physical and chemical weathering and heavy load has made the cracks in the lower parts of the stone construction. Also, cement and nails, which was used as repair material, during the repair work in the early 1960's, has accelerated the weathering process. Furthermore, weathered conditions of repair materials are very severe. Therefore, it is very urgent to establish of the conservation plan for the Sungryemun.
Keywords
Sungryemun; granite; repair material; weathering; black-coat;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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