| Creator |
|
|
|
| Language |
|
| Publisher |
|
|
|
| Date |
|
| Source Title |
|
| Vol |
|
| First Page |
|
| Last Page |
|
| Publication Type |
|
| Access Rights |
|
| JaLC DOI |
|
| Abstract |
九州大学総合研究博物館が所蔵する玉泉館資料の古代瓦から，飛鳥～平安時代に相当する瓦資料32点を選び，内部断面の電子顕微鏡装置（EPMA）による岩相分析を行った．瓦は部分的に内部が熔解している熔結組織と，内部が焼き固まっている焼結組織を呈するものに分けられる．焼結組織をもつ瓦断面からは，残存鉱物として，花崗岩由来の石英，斜長石，曹長石，正長石，黒雲母，白雲母，火山岩由来の火山ガラス，斜長石，黒雲母が...観察された．材料物質はおおむねこれらの混合物であり，材料供給地の特定は難しい．含まれる火山ガラスは，その化学組成から姶良カルデラ起源の姶良Tn（AT）火山灰，鬼界カルデラ起源のアカホヤ（K-Ah）火山灰と同定された．瓦内部に残存する鉱物と火山ガラスの組み合わせによって，瓦の焼成温度を推定した．焼結組織を呈する瓦は雲母の残る低温焼成（650～850℃）と，雲母はないが火山ガラスを包有する中間焼成（850～1150℃）のものに分けられる．一方，熔結組織は高温焼成（1150～1400℃）によって作られたものであった．観察した高温焼成の瓦は比較的少数で，瓦生産の黎明期には，高温焼成技術が確立されていなかった可能性を示唆している．
A series of lithological analysis for ancient roof tiles has been carried out using the electron microprobe technique. Thirty-two roof tile samples were selected from the Gyoku-sen-kan collection in the Kyushu University Museum, and are typologically-dated from the Asuka to Heian Periods, corresponding to the 7th to the 12th centuries AD. Based on electron microscopic observation, the textures of roof tiles’ interiors are divided in two types, such as sintered and welded textures that correspond to lower and higher firing temperatures, respectively. From the sections of sintered textured samples, quartz, K-feldspar, albite, plagioclase, biotite and muscovite of granitic origin, and glass shards, plagioclase and biotite of volcanic origin were identified. Mineral and glass assemblages suggest source materials were mixtures and it is difficult to identify distinct source areas. The contained volcanic glasses are derived from Aira caldera (AT) and Kikai caldera (K-Ah), which are meaning the firing temperature was not reached about magma temperature. The results indicate that there are three different firing temperatures, namely: lower (650-850℃) with mica; medium (850-1150℃) with volcanic glass; and higher (1150-1400℃) without volcanic glass and welded texture. It is suggested that high-temperature firing technique of kiln was not established yet in the early period of roof tile manufacturing in Kyushu area.show more
|
Export Mendeley
18_p015