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Tracing the source of iron bloom slags and iron ores excavated from archaeological sites in Chungju area, South Korea

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Abstract

Iron ores and iron bloom slags from two iron archaeological sites (Chilgeumdong: 300–600 AD, Wanori: ∼20th century) as well as iron ores from six iron deposits in Chungju, South Korea, were examined to assess the provenance of the raw iron ores. Different ore mineralogy proves to be a useful tool in interpreting the ore provenance of samples from the iron archaeological sites, although limited by the simplicity of the assemblage. The application of Ca + Al + Mn vs. Ti + V diagram for classifying the genetic type of magnetite suggests that the iron ores of the iron archaeological sites may have originated from multiple deposits. Comparing the chondrite-normalized REE patterns and the correlation between Lan and Cen in iron ores and iron bloom slags aids in determining the provenance of samples from the iron archaeological sites. Despite notable deviations, the use of Pb-Sr isotope ratios as a means of identifying the origin of unprocessed iron ores proves to be a meaningful approach. Based on our findings, it appears that the iron ores discovered at archaeological sites were typically sourced from nearby iron deposits like Changdong, Yeonsudong, Daekyo, and possibly Manjeong. This preference for local sources as opposed to more distant ones, such as Obok and Yusang, seems to have remained a constant throughout various historical epochs, spanning from the Baekjae to the Joseon period. Overall, this study demonstrates the effectiveness of integrated interpretation of various complementary approaches, including ore petrography, trace and rare earth element geochemistry, and Pb-Sr isotope analysis, in determining the provenance of raw iron ores excavated from iron archaeological sites.

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Acknowledgments

This research was conducted as a part of the Cultural Heritage Survey Research and Development (R&D) of the National Research Institute of Cultural Heritage under the Cultural Heritage Administration and was also supported by the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government (MOTIE) (20214000000500, Training program of CCUS for the green growth). The authors would like to thank staff of the Jungwon National Research Institute of Cultural Heritage for valuable assistance.

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Correspondence to Dongbok Shin.

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Table S1

. LA-ICP-MS analysis of magnetite from iron archaeological sites and iron deposits

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Jo, J., Kim, S., Shin, D. et al. Tracing the source of iron bloom slags and iron ores excavated from archaeological sites in Chungju area, South Korea. Geosci J 28, 193–212 (2024). https://doi.org/10.1007/s12303-024-0001-9

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  • DOI: https://doi.org/10.1007/s12303-024-0001-9

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