Montebras
Soumans, Creuse (Marche), France
Magmatic (Ni-Cu-PGE, carbonatites)Sn-Li
- Type
- Tin-lithium granite cupola and greisen
Greisenised Variscan leucogranite cupola, former tin then amblygonite mine. Indicative coordinates.
δ124Sn in ‰ (per mil) Values of the same system
Standard : NIST SRM 3161a
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 0.72 ‰ | 1 | cassiterite One analysis, Table 2. Ore age used by the authors: 310 Ma. | Mathur et al. (2025), Global Sn isotope compositions of cassiterite identify the magmatic… | |
| 0.67 ± 0.07 ‰ | 0.56 / 0.75 ‰ | 10 | primary cassiterite Mean and standard deviation recalculated from 10 samples, Appendix A5. Mean δ124/120Sn of 0.18 ‰ (Puratronic). Replicates of a sample averaged. Very homogeneous. | Marahrens (2021), Tin isotope analysis of tin ore deposits in Europe and Central Asia in … |
206Pb/204Pb isotope ratio, no unit Values of the same system
Standard : NIST SRM 981
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 98.4138 | 1 | cassiterite concentrate (bulk lead) Single analysis, "Lead isotopes - tin ores" sheet of OSM2 (vein, Montebras Mine). Partly radiogenic lead: the value depends on the uranium content of the ore. | Williams et al. (2025), From Land's End to the Levant: did Britain's tin sources transfor… |
207Pb/204Pb isotope ratio, no unit Values of the same system
Standard : NIST SRM 981
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 19.8513 | 1 | cassiterite concentrate (bulk lead) Single analysis, "Lead isotopes - tin ores" sheet of OSM2 (vein, Montebras Mine). Partly radiogenic lead: the value depends on the uranium content of the ore. | Williams et al. (2025), From Land's End to the Levant: did Britain's tin sources transfor… |
208Pb/204Pb isotope ratio, no unit Values of the same system
Standard : NIST SRM 981
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 38.6 | 1 | cassiterite concentrate (bulk lead) Single analysis, "Lead isotopes - tin ores" sheet of OSM2 (vein, Montebras Mine). Partly radiogenic lead: the value depends on the uranium content of the ore. | Williams et al. (2025), From Land's End to the Levant: did Britain's tin sources transfor… |
Deposits of the same type
- Échassières (Beauvoir granite) France
- Golpejas Spain
- Penouta Spain
- Varuträsk Sweden
- Keliber (Central Ostrobothnia) Finland
- Pechenga Russia
- Abu Dabbab Égypte
- Eastern Desert (Mueilha, Igla, Nuweibi) Égypte
Cite this page
IsoFind Atlas (2026). Montebras, isotope signatures. https://www.isofind.tech/isotopes/en/deposits/montebras/ (accessed 2026-10-13).
@misc{isofind2026montebrasisotopesignatures,
title = {Montebras, isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/montebras/},
note = {Accessed 2026-10-13}
}Updated : 2026-10-13