Yonaguni IV
Southern Okinawa Trough, west of Yonaguni (Japan), 1340 to 1390 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 and early barite-sphalerite-galena deposits. 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 |
|---|---|---|---|---|
| −0.1 ± 0.11 ‰ | −0.18 / −0.03 ‰ | 2 | chimney sphalerite Mean and standard deviation recalculated from 2 samples, Table 2. Formed at about 244 and 301 °C (Fe/Zn). | 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 |
|---|---|---|---|---|
| 18.5708 ± 0.0015 | 18.5694 / 18.5724 | 3 | hydrothermal deposit (whole rock) Mean and standard deviation recalculated from 3 samples, Table 3. Larger share of sedimentary lead than in the middle trough. | 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 |
|---|---|---|---|---|
| 15.6979 ± 0.001 | 15.6968 / 15.6986 | 3 | hydrothermal deposit (whole rock) Mean and standard deviation recalculated from 3 samples, Table 3. Larger share of sedimentary lead than in the middle trough. | 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 |
|---|---|---|---|---|
| 39.0842 ± 0.0067 | 39.0779 / 39.0912 | 3 | hydrothermal deposit (whole rock) Mean and standard deviation recalculated from 3 samples, Table 3. Larger share of sedimentary lead than in the middle trough. | Zhang et al. (2019), Zinc and lead isotope variation in hydrothermal deposits from the Ok… |
Deposits of the same type
- Tangyin Mer de Chine orientale
- Iheya Ridge Mer de Chine orientale
- Iheya North Mer de Chine orientale
- Matsumine Japan
- Doyashiki (Kannondo) Japan
- Fukazawa Japan
- Ezuri Japan
- Kosaka Japan
Cite this page
IsoFind Atlas (2026). Yonaguni IV, isotope signatures. https://www.isofind.tech/isotopes/en/deposits/yonaguni-iv/ (accessed 2026-10-13).
@misc{isofind2026yonaguniivisotopesignatures,
title = {Yonaguni IV, isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/yonaguni-iv/},
note = {Accessed 2026-10-13}
}Updated : 2026-10-13