Fukazawa
Akita Prefecture, Hokuroku district, Japan
Volcanogenic massive sulfidesZn-Pb-Cu (Ba)
- Type
- Kuroko-type volcanogenic massive sulfide
Kuroko-type massive sulfide deposit of the Hokuroku district, the type locality (Miocene). The ferruginous cherts (tetsusekiei) overlying the ores have widely scattered δ56Fe (-1.75 to +2.00 ‰ across the district), reflecting partial oxidation of hydrothermal iron in anoxic or suboxic pools; post-Kuroko ferruginous sediments range from -1.75 to +0.69 ‰, the youngest from -0.52 to +0.11 ‰. Deposit poor in yellow ore, whose ferruginous cherts carry positive δ56Fe. Indicative coordinates.
δ56Fe in ‰ (per mil) Values of the same system
Standard : IRMM-014
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| −1.39 ± 0.28 ‰ | −1.78 / −1.06 ‰ | 6 | black ore (kuroko) with sphalerite, galena and fine pyrite Mean and standard deviation recalculated from 6 samples, Supplementary Table 4. Bulk ore. | Otake et al. (2021), Large Fe isotope fractionations in sulfide ores and ferruginous sedi… |
| −0.52 ‰ | 1 | yellow ore (oko) with chalcopyrite and pyrite One analysis, Supplementary Table 4. | Otake et al. (2021), Large Fe isotope fractionations in sulfide ores and ferruginous sedi… | |
| 0.6 ± 0.98 ‰ | −0.09 / 1.29 ‰ | 2 | ferruginous chert and sediments (tetsusekiei) overlying the ore Mean and standard deviation recalculated from 2 samples, Supplementary Table 4. Bulk rock (microcrystalline hematite and quartz); variable Ce/Ce*. | Otake et al. (2021), Large Fe isotope fractionations in sulfide ores and ferruginous sedi… |
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Cite this page
IsoFind Atlas (2026). Fukazawa, isotope signatures. https://www.isofind.tech/isotopes/en/deposits/fukazawa/ (accessed 2026-10-13).
@misc{isofind2026fukazawaisotopesignatures,
title = {Fukazawa, isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/fukazawa/},
note = {Accessed 2026-10-13}
}Updated : 2026-10-13