Beaufor

Val-d'Or, Quebec (Abitibi greenstone belt), Canada

Orogenic goldAu

Type: Orogenic gold in quartz-tourmaline veins at the margin of the Bourlamaque pluton

Mine of the Val-d'Or vein field: quartz-tourmaline-carbonate (QTC) veins in shear zones. Daver et al. (2020): three-phase paragenesis, early gold and pyrite under reducing conditions, tourmaline and barite under an oxidizing fluid, then barren As-Co-Ni cubic pyrite; district tourmaline δ11B from -15.6 to -7.7 ‰, lighter to the west, mixing of a deep metamorphic fluid and a supracrustal fluid. Mine closed in 2019 east of the Bourlamaque pluton, at the contact with mafic rocks of the Dubuisson Formation; decimetre- to metre-scale lenses in subhorizontal extensional shears.

δ11B in ‰ (per mil) Values of the same system

Standard : NIST SRM 951

Value	Range	n	Mineral or matrix	Source
−9.9 ± 0.8 ‰	−11.2 / −8.9 ‰	17	tourmaline from a crack-and-seal quartz-tourmaline vein (sample 11, level 22C-355) Mean and standard deviation recalculated from 17 analyses, -11.2 to -8.9 (1 -9.1; 2 -8.9; 3 -8.9; 4 -9.5; 5 -9.4; 6 -11.0; 7 -11.1; 8 -9.6; 9 -9.3; 10 -9.7; 11 -9.6; 12 -9.4; 13 -10.9; 14 -11.2; 15 -10.5; 16 -9.7; 19 05 -10.9). Published mean -9.9 ± 0.7 ‰. Analysis "19 05" has a raw ratio from another session; analyses 17 and 18 are missing from the table.	Daver et al. (2020), Three-stage formation of greenstone-hosted orogenic gold deposits in…

Deposits of the same type

Cite this page

IsoFind Atlas (2026). Beaufor, isotope signatures. https://www.isofind.tech/isotopes/en/deposits/beaufor/ (accessed 2026-10-20).

@misc{isofind2026beauforisotopesignatures,
  title = {Beaufor, isotope signatures},
  author = {{IsoFind Atlas}},
  year = {2026},
  url = {https://www.isofind.tech/isotopes/en/deposits/beaufor/},
  note = {Accessed 2026-10-20}
}

Updated : 2026-10-20