Sítio da Coitadinha (Portugal)
Bragança district, Trás-os-Montes, Portugal
Other hydrothermalPb-Sb (Ag)
- Type
- Pb-Sb quartz veins (galena, berthierite, stibnite)
Stibnite-quartz veins of the Bragança district (Galicia-Trás-os-Montes zone), in allochthonous and parautochthonous thrust sheets with Silurian to Devonian phyllites; no granite crops out near the veins. N80°E vein, 0.30 m thick, at Grijó de Vale Benfeito (Macedo de Cavaleiros), 2 to 22 g/t Au and 28 to 280 g/t Ag. Stibnite lead (Neiva et al., 2008) close to the orogene curve, µ2 of 9.66 to 10.04: homogeneous upper-crustal source, probably the host metasediments. Coordinates not published (map only).
206Pb/204Pb isotope ratio, no unit Values of the same system
Standard : NIST SRM 981
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 18.235 ± 0.027 | 18.216 / 18.254 | 2 | stibnite Mean and standard deviation recalculated from 2 analyses, 18.216 to 18.254 (analyse 1 18.216; analyse 2 18.254); µ2 = 9.83, 10.02 (Stacey and Kramers). | Neiva et al. (2008), Antimony quartz and antimony-gold quartz veins from northern Portuga… |
207Pb/204Pb isotope ratio, no unit Values of the same system
Standard : NIST SRM 981
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 15.645 ± 0.031 | 15.623 / 15.667 | 2 | stibnite Mean and standard deviation recalculated from 2 analyses, 15.623 to 15.667 (analyse 1 15.623; analyse 2 15.667); µ2 = 9.83, 10.02 (Stacey and Kramers). | Neiva et al. (2008), Antimony quartz and antimony-gold quartz veins from northern Portuga… |
208Pb/204Pb isotope ratio, no unit Values of the same system
Standard : NIST SRM 981
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 38.344 ± 0.104 | 38.27 / 38.417 | 2 | stibnite Mean and standard deviation recalculated from 2 analyses, 38.270 to 38.417 (analyse 1 38.270; analyse 2 38.417); µ2 = 9.83, 10.02 (Stacey and Kramers). | Neiva et al. (2008), Antimony quartz and antimony-gold quartz veins from northern Portuga… |
Deposits of the same type
Cite this page
IsoFind Atlas (2026). Sítio da Coitadinha (Portugal), isotope signatures. https://www.isofind.tech/isotopes/en/deposits/sitio-da-coitadinha-portugal/ (accessed 2026-10-16).
@misc{isofind2026sitiodacoitadinhaportugalisot,
title = {Sítio da Coitadinha (Portugal), isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/sitio-da-coitadinha-portugal/},
note = {Accessed 2026-10-16}
}Updated : 2026-10-16