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J. Conserv. Sci > Volume 32(4); 2016 > Article
Journal of Conservation Science 2016;32(4):511-520.
DOI: https://doi.org/10.12654/JCS.2016.32.4.06    Published online December 31, 2016.
고온 XRD 분석법을 이용한 카라테파 불교사원 출토 점토벽돌의 소성온도 추정연구
한민수, 이장존, 김재환
Estimation Study of Firing Temperature for Fired Clay Brick Relics Excavated from Buddhist Temple in Karatepa Using Analytical Method of High Temperature X‐ray Diffraction
Min Su Han, Jang Jon Lee, Jae Hwan Kim
초 록
본 연구는 고온 XRD 분석법을 적용하여 우즈베키스탄 카라테파 불교사원에서 수습한 점토 재질로 된 벽돌의 소성온도를 추정하는데 목적이 있다. 사원에서 수습한 점토벽돌의 구성광물은 석영, 사장석, 알칼리장석, 운모, 녹니석, 석회석, 각섬석 등이 동정되고, 일부 시료에서 석고가 확인되며, 석고는 벽돌의 점착력을 향상시킬 목적으로 사용된 것으로 판단된다. 소성온도 추정결과, 구운 벽돌인 UZ-1시료에서 석영, 사장석, 휘석계열의 광물이 동정되어 지질온도계를 이용한 소성온도는 900~1200℃로 추정된다. 반면 점토벽돌인 UZ-5에 고온 XRD 분석법을 적용해 보면, 1000℃에서 석회석이 소멸하고, 1050℃에서 녹니석의 회절 피크가 약해지는 것으로 보아 소성온도는 1000~1050℃인 것으로 추정된다. 또한 휘석계열의 광물은 재현실험에서 1050℃에서 생성되는 것을 확인하였다. 결과적으로 고온 XRD 분석결과에 의한 소성온도 추정은 일반적인 광물 동정법에 비해 보다 정확한 추정이 가능하며, 실험 하에서 광물의 소멸 및 생성 온도 영역을 살펴볼 수 있는 분석법임을 확인하였다.
중심어: 고온 XRD, 지질온도계, 소성온도, 점토벽돌, 카라테파 불교사원
ABSTRACT
The purpose of this study was to estimate the firing temperature of fired clay brick by applying high temperature X-ray diffraction(XRD) analysis. The clay bricks, which were excavated from a Buddhist temple in Karatepa, Uzbekistan were composed of quartz, plagioclase, alkali feldspar, mica, chlorite, limestone, hornblende, etc. Some clay bricks contained gypsum, which was presumed to have been used to improve the adhesive strength of the brick. Estimating the firing temperature using a geologic thermometer, the UZ-1 sample was identified as being in the quartz, plagioclase,pyroxene series, and the firing temperature was estimated to be 900-1200℃. On the other hand, applying the high temperature XRD method to the UZ-5 sample, it was found that the limestone was destroyed at 1000℃ and the diffraction peak of chlorite was weakened at 1050℃. Moreover, pyroxene series minerals developed at 1050℃ in the reproduction experiment. These results indicate that the clay bricks used in the temple were produced in a kiln that reached a temperature of more than 1000℃. Thus, high temperature XRD analysis can more accurately estimate firing temperatures as compared to the firing temperature mineral identification method and it can be used to determine the creation and extinctiontemperature range of minerals.
Key Words: High temperature XRD, Geologic thermometer, Firing temperature, Clay brick, Karatepa Buddhist temple
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