Bragança district (Portelo, Ribeira)
Bragança district, Trás-os-Montes, Portugal
Other hydrothermalSn (W)
- Type
- Granite-related cassiterite veins and greisens
Cassiterite greisens and veins of Portelo and Ribeira, and two samples without precise locality. 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 |
|---|---|---|---|---|
| 0.56 ± 0.33 ‰ | 0.23 / 1.07 ‰ | 6 | primary cassiterite Mean and standard deviation recalculated from 6 samples, Appendix A3. Mean δ124/120Sn of 0.15 ‰ (Puratronic). Replicates of a sample averaged. Breakdown (δ124Sn): unknown locality 0.50, 0.25; Mina da Ribeira 1.07; Mina do Portelo 0.83, 0.50, 0.23. | Marahrens (2021), Tin isotope analysis of tin ore deposits in Europe and Central Asia in … |
Deposits of the same type
- Calabor Spain
- Ourense Province (tin fields) Spain
- Vila Real district (including Borralha) Portugal
- Guarda district (Belmonte, Torrinhas, Fonte do Seixo) Portugal
- Salamanca Province (unspecified origin) Spain
- Aveiro district (Regoufe, Bustelo) Portugal
- Galicia (unspecified origin) Spain
- Viseu district (tin fields) Portugal
Cite this page
IsoFind Atlas (2026). Bragança district (Portelo, Ribeira), isotope signatures. https://www.isofind.tech/isotopes/en/deposits/district-de-braganca-portelo-ribeira/ (accessed 2026-10-13).
@misc{isofind2026bragancadistrictporteloribeir,
title = {Bragança district (Portelo, Ribeira), isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/district-de-braganca-portelo-ribeira/},
note = {Accessed 2026-10-13}
}Updated : 2026-10-13