Open Access
Table 1
Summary of the EPMA assays obtained on arsenopyrite from the Brioude-Massiac W-As-Bi-Au veins and gold from Bonnac. Estimated temperatures of crystallization with the arsenopyrite geothermometer are compared with the fluid-inclusions data (Bril, 1982).
| Arsenopyrite composition | Number of analysis | S (wt %) | Std | Fe | Std | As | Std | Sb | Std | Au | Std | Total | As (at %) | Std | T (°C) (Kretschmar and Scott, 1976) | Trapping temperature (°C) estimated by fluid inclusions (Bril, 1982) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Asp from Bonnac W-As-Bi-Au veins (data from this study and Bril, 1983) | 60 | 19.30 | 0.50 | 34.40 | 0.32 | 45.70 | 0.68 | 0.01 | 0.03 | bdl | 99.41 | 33.4 | 0.66 | 485 | >350 | |
| Asp from Vèze W-As-Bi-Au veins (data from Bril, 1983) | 3 | 19.74 | 0.63 | 34.87 | 0.26 | 45.39 | 0.89 | bdl | bdl | 100 | 32.8 | 0.87 | 470 | >350 | ||
| Asp from Bosberty W-As-Bi-Au veins (data from Bril, 1983) | 4 | 19.10 | 0.46 | 35.43 | 0.19 | 45.47 | 0.63 | bdl | bdl | 100 | 33.0 | 0.61 | 480 | >350 | ||
| Gold composition | Number of analysis | Ag (wt %) | Std | Au | Std | Total | ||||||||||
| Gold from W-As-Bi-Au veins | 10 | 16.7 | 5.70 | 82.60 | 6.92 | 99.30 |
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