Quartzito
São Paulo State, Serra do Itaberaba Group (central Ribeira Belt), about 50 km NE of São Paulo, Brazil
Orogenic goldAu (Cu, Pb, Zn)
- Type
- Gold and base metals in quartz-tourmaline-carbonate veins
Morro da Pedra Preta volcano-sedimentary Formation (Serra do Itaberaba Group, Mesoproterozoic, submarine back-arc basin), metamorphosed under amphibolite facies (peak at 640 °C and 750 MPa). Gold prospect with discordant veins tied to secondary faults of the Sertãozinho Fault System, metachert host. Garda et al. (2009): acicular green vein tourmaline heavier (-5 to -8 ‰, fluids from marine volcano-sedimentary rocks) than pale blue tourmaline of quartz-carbonate veins (-15 to -7 ‰, crustal fluids tied to Brasiliano granitoids or metasediments). Coordinates not published.
δ11B in ‰ (per mil) Values of the same system
Standard : NIST SRM 951
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| −13.06 ± 1.72 ‰ | −15.67 / −9.33 ‰ | 10 | tourmaline of the host metachert (sample F08-13) Mean and standard deviation recalculated from 10 analyses, -15.67 to -9.33 (F08-13 -12.88; F08-13 -15.67; F08-13 -12.12; F08-13 -12.63; F08-13 -12.63; F08-13 -14.15; F08-13 -13.13; F08-13 -14.91; F08-13 -9.33; F08-13 -13.13). | Garda et al. (2009), Boron isotope composition of tourmalinite and vein tourmalines assoc… |
| −6.62 ± 2.19 ‰ | −12.27 / −4.84 ‰ | 12 | acicular green vein tourmaline (sample FQ112-3A) Mean and standard deviation recalculated from 12 analyses, -12.27 to -4.84 (FQ112-3A -4.95; FQ112-3A -5.90; FQ112-3A -5.06; FQ112-3A -5.50; FQ112-3A -6.45; FQ112-3A -5.35; FQ112-3A -7.08; FQ112-3A -9.51; FQ112-3A -12.27; FQ112-3A -6.27; FQ112-3A -6.20; FQ112-3A -4.84). Quartz-tourmaline equilibrium at 570 °C (Kotzer et al., 1993) or 650 °C (Zheng, 1993) from Garda et al. (2003); calculated water at δD -91.7 ‰ and δ18O +12.3 ‰. | Garda et al. (2009), Boron isotope composition of tourmalinite and vein tourmalines assoc… |
| −11.08 ± 2.02 ‰ | −14.8 / −7.32 ‰ | 12 | pale blue tourmaline of quartz-carbonate veins (sample FQ112-46) Mean and standard deviation recalculated from 12 analyses, -14.80 to -7.32 (FQ112-46 -11.57; FQ112-46 -8.93; FQ112-46 -7.32; FQ112-46 -10.32; FQ112-46 -9.99; FQ112-46 -14.80; FQ112-46 -11.90; FQ112-46 -10.01; FQ112-46 -12.80; FQ112-46 -12.21; FQ112-46 -12.92; FQ112-46 -10.23). | Garda et al. (2009), Boron isotope composition of tourmalinite and vein tourmalines assoc… |
Deposits of the same type
- Muruntau Uzbekistan
- Kalgoorlie (Golden Mile) Australia
- Victorian Goldfields Australia
- Ashanti (Obuasi) Ghana
- Loulo (district de Gara-Yalea) Mali
- Gounkoto Mali
- Massawa Senegal
- Kirkland Lake (Macassa mine) Canada
Cite this page
IsoFind Atlas (2026). Quartzito, isotope signatures. https://www.isofind.tech/isotopes/en/deposits/quartzito/ (accessed 2026-10-19).
@misc{isofind2026quartzitoisotopesignatures,
title = {Quartzito, isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/quartzito/},
note = {Accessed 2026-10-19}
}Updated : 2026-10-19