Porto district (Rebordosa, Friande)
Porto district, Portugal
Other hydrothermalSn (W)
- Type
- Granite-related cassiterite veins and greisens
Tin mines of Rebordosa and São Tomé de Friande. 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 |
|---|---|---|---|---|
| 0.28 ± 0.04 ‰ | 0.25 / 0.31 ‰ | 2 | primary cassiterite Mean and standard deviation recalculated from 2 samples, Appendix A3. Mean δ124/120Sn of 0.01 ‰ (Puratronic). Replicates of a sample averaged. Breakdown (δ124Sn): Mina da Rebordosa 0.31; S. Tomé de Friande 0.25. | Marahrens (2021), Tin isotope analysis of tin ore deposits in Europe and Central Asia in … |
| −0.1 ‰ | 1 | cassiterite Single analysis, Table 1 (POR 08). Sample labelled only "Oporto", assigned to the Porto district with no precise deposit. | Mathur et al. (2024), Isotopic metal compositions of Viking and medieval tin artifacts fr… |
Deposits of the same type
- Valongo (vein field) Portugal
- Aveiro district (Regoufe, Bustelo) Portugal
- Viana do Castelo district (Caminha, Fontão) Portugal
- Vila Real district (including Borralha) Portugal
- Viseu district (tin fields) Portugal
- Pontevedra Province (Silleda, Tui, Forcarei) Spain
- Panasqueira Portugal
- Ourense Province (tin fields) Spain
Cite this page
IsoFind Atlas (2026). Porto district (Rebordosa, Friande), isotope signatures. https://www.isofind.tech/isotopes/en/deposits/district-de-porto-rebordosa-friande/ (accessed 2026-10-13).
@misc{isofind2026portodistrictrebordosafriande,
title = {Porto district (Rebordosa, Friande), isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/district-de-porto-rebordosa-friande/},
note = {Accessed 2026-10-13}
}Updated : 2026-10-13