Koniambo
Koniambo massif, North Province, New Caledonia, France
OtherNi (Co)
- Type
- Nickel laterite on peridotite (saprolite and garnierite)
Klippe of the Eocene obducted peridotite nappe, capped by a laterite about 40 m thick: goethite limonite, saprolite with disseminated ore and garnierite along fractures, little altered peridotite, then a sheared serpentine sole with magnesite veins sometimes associated with amorphous silica. The per descensum model links veins and lateritisation; magnesite Δ47 thermometry (0.652 to 0.695 ‰, i.e. 26 ± 4 to 35 ± 6 °C, Kluge et al., 2015 calibration) gives an equilibrium water of -8.4 to -11.2 ‰ (δ18O), of meteoric origin. Indicative coordinates.
δ18O in ‰ (per mil) Values of the same system
Standard : V-SMOW
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 27.4 / 29.5 ‰ | 36 | serpentine-sole vein magnesite individual values not published (Figure 5 only). Homogeneous δ18O: constant, low-temperature formation conditions. | Quesnel et al. (2015), Formation of silica and magnesite veins in the massif of peridotit… | |
| 28 ‰ | 25 | vein silica (quartz, amorphous silica) approximate central value, spread of about 10 ‰ around it. Translucent amorphous silica of the sole and late brown silica of the saprolite above +30 ‰; quartz veins of the fracture networks below 27 ‰, formed hotter, which questions their supergene origin. | Quesnel et al. (2015), Formation of silica and magnesite veins in the massif of peridotit… |
δ13C in ‰ (per mil) Values of the same system
Standard : V-PDB
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| −17 / −8.5 ‰ | 36 | serpentine-sole vein magnesite individual values not published (Figure 5 only). At least two carbon sources: soil organic carbon near -15 ‰ (or kinetic effects in highly alkaline fluids), atmospheric for the high values. | Quesnel et al. (2015), Formation of silica and magnesite veins in the massif of peridotit… |
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Cite this page
IsoFind Atlas (2026). Koniambo, isotope signatures. https://www.isofind.tech/isotopes/en/deposits/koniambo/ (accessed 2026-10-13).
@misc{isofind2026koniamboisotopesignatures,
title = {Koniambo, isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/koniambo/},
note = {Accessed 2026-10-13}
}Updated : 2026-10-13