Geological occurrences and geochemical provenance of obsidian from the Oki Islands, Iki Island, and northwestern Kyushu

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To document the geological occurrences and lithological characteristics of obsidian across the Oki Islands, Iki Island, and northwestern Kyushu and establish a comprehensive geochemical provenance database.
Performed quantitative chemical analysis on obsidian rock samples using wavelength-dispersive X-ray fluorescence (WD-XRF).
Constructed a comparative geochemical database integrating newly measured compositional data with previously published literature values.
Classified and systematized 24 distinct petrological and geochemical obsidian provenances across the study regions.
Identified three newly recognized geochemical provenances: Oki Kumi 2, Hario Nakamachi 2, and Hario Nakamachi 3.

Geochemical analysis reveals 24 distinct obsidian provenance groups across Western Japan, identifying three newly recognized volcanic sources.

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Kamei et al. (2026) studied this question.

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