Elsevier BV Acta Medica Okayama 2352-409X 70 2026 A semi-quantitative archaeothermometer based on feldspar and volcanic glass compositions in ancient ceramics from the Kibi region, Japan 105566 EN Toshio Nozaka Department of Earth Sciences, Okayama University Naoya Ohbayashi Department of Earth Sciences, Okayama University Yuki Toda Department of Earth Sciences, Okayama University Taiji Anami Department of Earth Sciences, Okayama University Kanako Sugiura Department of Archaeology, Okayama University Takahiro Nozaki Research Institute for the Dynamics of Civilizations, Okayama University Osamu Kimura Research Institute for the Dynamics of Civilizations, Okayama University Naoko Matsumoto Research Institute for the Dynamics of Civilizations, Okayama University Akira Seike Department of Archaeology, Okayama University In this study, we analyzed the chemical compositions of feldspar and volcanic glass clasts in haniwa from kofuns and Sue ware from the Sabukaze kiln site, both in the Kibi region, southwestern Japan, to estimate the thermal conditions of ceramic firing in the 5th–8th centuries CE. Based on the coexistence of molten and unmolten feldspar rims, the solidus temperatures were estimated at ∼ 1050°C–1150°C for haniwa and ∼ 1150°C–1200°C for Sue ware. Volcanic glass compositions changed systematically during firing, showing increases in K2O and decreases in Na2O. From these observations, we propose a semi-quantitative archaeothermometer using variations in the K/Na molar ratio of volcanic glass within a ceramic matrix. This approach can be applied to investigate the development of kiln-firing in the Kibi region, the existence of haniwa potters employing different firing methods, variation in heat input for producing Sue vessels of differing sizes or functions, and temperature-controlled practices in Sue ware production. No potential conflict of interest relevant to this article was reported.

Elsevier BV Acta Medica Okayama 2352-409X 60 2024 Petrological characterization for material provenance of haniwa earthenware from mounded tombs in the Kibi region, Japan 104813 EN Toshio Nozaka Department of Earth Sciences, Okayama University Naoya Ohbayashi Department of Earth Sciences, Okayama University Yuki Toda Department of Earth Sciences, Okayama University Kanako Sugiura Department of Archaeology, Okayama University Takahiro Nozaki Research Institute for the Dynamics of Civilizations, Okayama University Osamu Kimura Research Institute for the Dynamics of Civilizations, Okayama University Naoko Matsumoto Research Institute for the Dynamics of Civilizations, Okayama University Akira Seike Department of Archaeology, Okayama University To determine the provenance of the materials used in the production of haniwa earthenware unearthed from mounded tombs (kofun) in the Kibi region (modern Okayama Prefecture) during the Kofun period (late 3rd – 6th century CE) of Japan, we carried out petrological analyses of haniwa sherds, including optical microscopy, X-ray diffractometry, X-ray fluorescence spectroscopy, and electron-probe analysis. The 25 haniwa sherds analyzed from 12 representative mounded tombs are composed of mineral and rock inclusions with variable grain size set in a clay matrix. The dominant inclusions are quartz, K-feldspar, and plagioclase, associated with minor amounts of amphibole, volcanic glass, and granitic rocks in all the haniwa sherds, and small amounts of hornfels, quartz rock, and accessory minerals, including mica, ilmenite, and chromite, in some of the sherds. Amphibole and plagioclase have compositional variations indicative of the mixing of tephra and granitic components. The compositions of volcanic glass inclusions are similar to those of the Aira-Tanzawa and Kikai-Akahoya tephras widely distributed in southwestern Japan. Bulk chemical compositions show magmatic differentiation trends, which are variable between individual tombs. From these results, it is concluded that the paste materials of haniwa in the Kibi region were commonly derived from weathered granitic rocks mixed with minor amounts of three widespread tephras. The variations of chemical and mineralogical compositions are probably the reflection of local geologic settings, suggesting the presence of specific mining sites of paste materials around each tomb. The mining sites could be located at the bases of hills of granitic rocks covered by widespread tephras and in some cases, near the flood plain of big river systems. No potential conflict of interest relevant to this article was reported.

岡山大学文明動態学研究所 Acta Medica Okayama 2436-8326 3 2024 趣旨説明 134 140 EN Naoko MATSUMOTO 展望：文明動態学研究所第１回特別展　津島から世界へ、世界から津島へ (Perspectives: From Tsushima to the world and from the world to Tsushima) 10.18926/66197 No potential conflict of interest relevant to this article was reported.

岡山大学文学部考古学研究室 Acta Medica Okayama 2023 鳥取県西伯郡大山町岩伏し遺跡第３次〜第６次発掘調査報告書 EN Naoko Matsumoto No potential conflict of interest relevant to this article was reported.

岡山大学文学部考古学研究室 Acta Medica Okayama 2016 鳥取県西伯郡大山町岩伏し遺跡第1次・第2次発掘調査報告書 EN Naoko Matsumoto Research Department of Archaeology Faculty of Letters Okayama University 主な遺跡は縄文時代早期押型文土器、縄文時代後期の土器・石器。縄文早期の地表面を確認、黒ボク層中で土器集中部を検出。 No potential conflict of interest relevant to this article was reported.

岡山大学文明動態学研究所 Acta Medica Okayama 2436-8326 1 2022 創刊にあたって 1 2 EN Naoko Matsumoto 巻頭言(Foreword) No potential conflict of interest relevant to this article was reported.

岡山大学文学部 Acta Medica Okayama 2019 はじめに EN Ayami Nakatani Naoko Matsumoto Jun Mitsumoto No potential conflict of interest relevant to this article was reported.

岡山大学文学部考古学研究室 Acta Medica Okayama 2004 瓜生田遺跡発掘調査概報 EN No potential conflict of interest relevant to this article was reported.

岡山大学文学部考古学研究室 Acta Medica Okayama 2014 ニ本松上郷後峯遺跡発掘調査報告書 EN Naoko Matsumoto No potential conflict of interest relevant to this article was reported.

岡山大学文学部考古学研究室 Acta Medica Okayama 2013 井後草里遺跡第4次・第5次発掘調査報告書 EN Naoko Matsumoto No potential conflict of interest relevant to this article was reported.

岡山大学文学部考古学研究室 Acta Medica Okayama 2010 井後草里遺跡第3次発掘調査報告書 EN Naoko Matsumoto No potential conflict of interest relevant to this article was reported.

岡山大学文学部考古学研究室 Acta Medica Okayama 2008 井後草里遺跡第2次発掘調査報告書 EN Naoko Matsumoto No potential conflict of interest relevant to this article was reported.

岡山大学文学部考古学研究室 Acta Medica Okayama 2007 出崎船越南遺跡発掘調査報告書 EN Naoko Matsumoto No potential conflict of interest relevant to this article was reported.

岡山大学大学院文化科学研究科 Acta Medica Okayama 1880-9162 1 1 2003 日本列島の先史時代における異文化接触と文化の生成：学際的共同研究に向けて 117 126 EN Naoko Matsumoto 10.18926/1730 文化共生学の実践的研究の一環として、日本列島の先史時代における異文化接触と文化の生成をテーマにした考古学・人類学・社会学・社会心理学による共同研究を計画している。このプロジェクトは緒についたばかりであり、具体的な成果を出すにはまだ時間がかかると思われるが、本稿では、この研究テーマの概要と意義、とくに学際的な共同研究が必要である理由について述べ、今後の研究の方向性を示すことにしたい。 No potential conflict of interest relevant to this article was reported.