Kosaka
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 ‰. Indicative coordinates.
δ56Fe in ‰ (per mil) Values of the same system
Standard : IRMM-014
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| −0.61 ± 0.52 ‰ | −1.29 / −0.05 ‰ | 5 | ferruginous chert and sediments (tetsusekiei) overlying the ore Mean and standard deviation recalculated from 5 samples, Supplementary Table 4. Including two barite-rich samples. | Otake et al. (2021), Large Fe isotope fractionations in sulfide ores and ferruginous sedi… |
Deposits of the same type
- Fukazawa Japan
- Ezuri Japan
- Doyashiki (Kannondo) Japan
- Matsumine Japan
- Iheya North Mer de Chine orientale
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- Tangyin Mer de Chine orientale
- Yonaguni IV Mer de Chine orientale
Cite this page
IsoFind Atlas (2026). Kosaka, isotope signatures. https://www.isofind.tech/isotopes/en/deposits/kosaka/ (accessed 2026-10-13).
@misc{isofind2026kosakaisotopesignatures,
title = {Kosaka, isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/kosaka/},
note = {Accessed 2026-10-13}
}Updated : 2026-10-13