Viana do Castelo district (Caminha, Fontão)
Viana do Castelo district, Minho, Portugal
Other hydrothermalSn (W)
- Type
- Granite-related cassiterite veins and greisens
Tin occurrences of Minho (Penedo da Poça, Gondar near Caminha, Fontão, Nogueira Almonde). Cassiterite studied by Marahrens (2021) for Bronze Age tin provenance. Approximate position of the administrative district; mines are listed in the notes. Indicative coordinates.
δ124Sn in ‰ (per mil) Values of the same system
Standard : NIST SRM 3161a
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 0.27 ± 0.4 ‰ | −0.2 / 0.85 ‰ | 5 | primary cassiterite Mean and standard deviation recalculated from 5 samples, Appendix A3. Mean δ124/120Sn of 0.00 ‰ (Puratronic). Replicates of a sample averaged. Breakdown (δ124Sn): Penedo da Poça, Vale Garrido 0.85; Gondar, Caminha -0.01; unknown locality 0.33, -0.20; Minas do Fontao 0.38. Samples MA-171002 and MA-153246 (-0.14 ‰), repeated identically in Appendix A7, are counted as secondary. | Marahrens (2021), Tin isotope analysis of tin ore deposits in Europe and Central Asia in … |
| 0.16 ± 0.3 ‰ | −0.05 / 0.37 ‰ | 2 | secondary cassiterite (placers) Mean and standard deviation recalculated from 2 samples, Appendix A7. Mean δ124/120Sn of -0.04 ‰ (Puratronic). Replicates of a sample averaged. Breakdown (δ124Sn): Nogueira Almonde 0.37; Caminha -0.05. | 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 |
|---|---|---|---|---|
| 40.8111 / 45.2091 | 2 | cassiterite concentrate (bulk lead) Range of 2 ores, "Lead isotopes - tin ores" sheet of OSM2 (buried placer, placer). Cassiterite lead is partly radiogenic and spreads along an isochron: no representative central value. Sites: Nogueira, Stream. | 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 |
|---|---|---|---|---|
| 16.8373 / 17.0546 | 2 | cassiterite concentrate (bulk lead) Range of 2 ores, "Lead isotopes - tin ores" sheet of OSM2 (buried placer, placer). Cassiterite lead is partly radiogenic and spreads along an isochron: no representative central value. Sites: Nogueira, Stream. | 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 |
|---|---|---|---|---|
| 38.923 / 39.03 | 2 | cassiterite concentrate (bulk lead) Range of 2 ores, "Lead isotopes - tin ores" sheet of OSM2 (buried placer, placer). Cassiterite lead is partly radiogenic and spreads along an isochron: no representative central value. Sites: Nogueira, Stream. | Williams et al. (2025), From Land's End to the Levant: did Britain's tin sources transfor… |
Deposits of the same type
- Pontevedra Province (Silleda, Tui, Forcarei) Spain
- Valongo (vein field) Portugal
- Porto district (Rebordosa, Friande) Portugal
- Vila Real district (including Borralha) Portugal
- San Finx Spain
- A Coruña Province (various tin occurrences) Spain
- Aveiro district (Regoufe, Bustelo) Portugal
- Galicia (unspecified origin) Spain
Cite this page
IsoFind Atlas (2026). Viana do Castelo district (Caminha, Fontão), isotope signatures. https://www.isofind.tech/isotopes/en/deposits/district-de-viana-do-castelo-caminha-fontao/ (accessed 2026-10-13).
@misc{isofind2026vianadocastelodistrictcaminha,
title = {Viana do Castelo district (Caminha, Fontão), isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/district-de-viana-do-castelo-caminha-fontao/},
note = {Accessed 2026-10-13}
}Updated : 2026-10-13