Iheya Ridge
Middle Okinawa Trough, off Okinawa (Japan), about 1550 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. Deposits rich in tabular pyrrhotite, with sphalerite and minor chalcopyrite. Coordinates of the dredged samples.
206Pb/204Pb isotope ratio, no unit Values of the same system
Standard : NIST SRM 981
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 18.5689 ± 0.003 | 18.5668 / 18.571 | 2 | hydrothermal deposit (whole rock) Mean and standard deviation recalculated from 2 samples, Table 3. | 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 |
|---|---|---|---|---|
| 15.6706 ± 0.0016 | 15.6695 / 15.6717 | 2 | hydrothermal deposit (whole rock) Mean and standard deviation recalculated from 2 samples, Table 3. | 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 |
|---|---|---|---|---|
| 38.8914 ± 0.0043 | 38.8883 / 38.8944 | 2 | hydrothermal deposit (whole rock) Mean and standard deviation recalculated from 2 samples, Table 3. | Zhang et al. (2019), Zinc and lead isotope variation in hydrothermal deposits from the Ok… |
Deposits of the same type
- Iheya North 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 Ridge, isotope signatures. https://www.isofind.tech/isotopes/en/deposits/iheya-ridge/ (accessed 2026-10-13).
@misc{isofind2026iheyaridgeisotopesignatures,
title = {Iheya Ridge, isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/iheya-ridge/},
note = {Accessed 2026-10-13}
}Updated : 2026-10-13