Duanqiao hydrothermal field
Southwest Indian Ridge, segment 27 (50°24′E), Océan Indien (eaux internationales)
Volcanogenic massive sulfidesCu-Zn (Ga)
- Type
- Ultraslow-ridge seafloor massive sulphides
Ultraslow Southwest Indian Ridge (half-spreading rate 0.7 to 0.9 cm/yr), between the Indomed and Gallieni transform faults. Field found during cruise DY-20 on an axial high with thick crust and active volcanism (about 1700 m deep), activity over about 200 × 125 m; loose mounds and collapsed chimneys of pyrite, chalcopyrite and sphalerite on basalts. Sulphide δ71Ga close to that of the nearby MORB (+1.22 ‰): gallium mainly leached from the basalts, with minor seawater and sediment contributions; the 0.6 ‰ spread among sulphides would reflect rapid precipitation or mixing of generations (Zhang et al., 2021). Indicative coordinates from Duanqiao Hill (IHO gazetteer proposal), next to the field.
δ71Ga in ‰ (per mil) Values of the same system
Standard : NIST SRM 994
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 1.19 ± 0.24 ‰ | 0.93 / 1.55 ‰ | 5 | massive sulphides (whole rock) Mean and standard deviation recalculated from 5 analyses, samples MS-3 to MS-7, 1.7 to 29.5 µg/g Ga; the most Ga-rich (MS-7) is the lightest. | Zhang et al. (2021), Ga isotopic fractionation in sulfides from the Yuhuang and Duanqiao … |
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Cite this page
IsoFind Atlas (2026). Duanqiao hydrothermal field, isotope signatures. https://www.isofind.tech/isotopes/en/deposits/champ-hydrothermal-de-duanqiao/ (accessed 2026-10-15).
@misc{isofind2026duanqiaohydrothermalfieldisot,
title = {Duanqiao hydrothermal field, isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/champ-hydrothermal-de-duanqiao/},
note = {Accessed 2026-10-15}
}Updated : 2026-10-15