Iheya North
Middle Okinawa Trough, off Okinawa (Japan), 1000 to 1090 m depth, Mer de Chine orientale
Volcanogenic massive sulfidesZn-Pb-Cu (Ba)
- Type
- Modern seafloor hydrothermal sulfides (back-arc)
Seafloor hydrothermal field of the incipient Okinawa Trough back-arc basin, on thinned, sediment-covered continental crust. Lead mixes local volcanic and sedimentary lead; zinc mainly comes from the volcanics, with kinetic fractionation during sphalerite precipitation. Sphalerite-rich chimneys with chalcopyrite and pyrite; sphalerite formed at about 243 to 249 °C from its Fe/Zn ratio. Coordinates of the dredged samples.
δ66Zn in ‰ (per mil) Values of the same system
Standard : JMC 3-0749L
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 0.06 ± 0.05 ‰ | 0.02 / 0.12 ‰ | 3 | chimney sphalerite Mean and standard deviation recalculated from 3 samples, Table 2. Replicates averaged before computation. | Zhang et al. (2019), Zinc and lead isotope variation in hydrothermal deposits from the Ok… |
206Pb/204Pb isotope ratio, no unit Values of the same system
Standard : NIST SRM 981
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 18.4652 ± 0.0124 | 18.4517 / 18.4761 | 3 | hydrothermal deposit (whole rock) Mean and standard deviation recalculated from 3 samples, Table 3. The least radiogenic of the fields studied: mainly volcanic lead. | Zhang et al. (2019), Zinc and lead isotope variation in hydrothermal deposits from the Ok… |
207Pb/204Pb isotope ratio, no unit Values of the same system
Standard : NIST SRM 981
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 15.6384 ± 0.0034 | 15.6346 / 15.6411 | 3 | hydrothermal deposit (whole rock) Mean and standard deviation recalculated from 3 samples, Table 3. The least radiogenic of the fields studied: mainly volcanic lead. | Zhang et al. (2019), Zinc and lead isotope variation in hydrothermal deposits from the Ok… |
208Pb/204Pb isotope ratio, no unit Values of the same system
Standard : NIST SRM 981
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 38.7126 ± 0.021 | 38.6897 / 38.7309 | 3 | hydrothermal deposit (whole rock) Mean and standard deviation recalculated from 3 samples, Table 3. The least radiogenic of the fields studied: mainly volcanic lead. | Zhang et al. (2019), Zinc and lead isotope variation in hydrothermal deposits from the Ok… |
Deposits of the same type
- Iheya Ridge Mer de Chine orientale
- Tangyin Mer de Chine orientale
- Yonaguni IV Mer de Chine orientale
- Matsumine Japan
- Doyashiki (Kannondo) Japan
- Fukazawa Japan
- Ezuri Japan
- Kosaka Japan
Cite this page
IsoFind Atlas (2026). Iheya North, isotope signatures. https://www.isofind.tech/isotopes/en/deposits/iheya-north/ (accessed 2026-10-13).
@misc{isofind2026iheyanorthisotopesignatures,
title = {Iheya North, isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/iheya-north/},
note = {Accessed 2026-10-13}
}Updated : 2026-10-13