| Titre | Vertical seismic profiling at the Bell Allard orebody, Matagami, Quebec |
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| Auteur | Adam, E; Bohlen, T; Milkereit, B |
| Source | Hardrock seismic exploration; par Eaton, D W (éd.); Milkereit, B (éd.); Salisbury, M H (éd.); Society of Exploration Geophysicists, Geophysical Developments Series no. 10, 2003 p. 181-193, https://doi.org/10.1190/1.9781560802396.ch12 |
| Année | 2003 |
| Séries alt. | Commission géologique du Canada, Contributions aux publications extérieures 2000158 |
| Éditeur | Society of Exploration Geophysicists |
| Document | publication en série |
| Lang. | anglais |
| DOI | https://doi.org/10.1190/1.9781560802396.ch12 |
| Media | papier; en ligne; numérique |
| Référence reliée | Cette publication est contenue dans Hardrock
seismic exploration |
| Formats | pdf |
| Province | Québec |
| SNRC | 32F |
| Région | Matagami |
| Lat/Long OENS | -78.0000 -76.0000 50.0000 49.0000 |
| Sujets | profils sismiques; gîtes sulfureux; gîtes volcanogènes; ondes P; gisements minéraux; vitesse des ondes sismiques; sismicité; ondes transversales; levés sismiques; interpretations sismiques;
géophysique |
| Illustrations | cartes de localisation; cartes géologiques généralisées; graphiques; profils de réflexion sismique; profils sismiques |
| Programme | Programme des partenaires industriels
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| Programme | CRSNG Conseil de recherches en sciences
naturelles et en génie du Canada |
| Diffusé | 2012 03 21 |
| Résumé | (disponible en anglais seulement)
Two vertical seismic profile (VSP) surveys have been acquired in the vicinity of a 1-km deep volcanogenic massive sulfide (VMS) deposit in the Abitibi
Sub-province of northwestern Québec. The VSP data show that the average P-wave velocity of the top 1 km of the crust around the orebody is about 6300 m/s, whereas S-wave velocities are estimated at about 3600 m/s. The agreement between the average
velocity derived from VSP and sonic logging data confirm their accuracy. One VSP survey intersected massive sulfides and recorded strong P-waves and converted S-waves scattered from the ore deposit. The second VSP survey, located about 200 m to the
northeast of the deposit, imaged a basalt/rhyolite contact; however, no prominent scattered events from the ore zone were observed. Seismic modeling shows that the VMS deposits of the Matagami mining camp generate strong scattered P- and converted
S-waves. However, the amplitudes decrease rapidly with distance and exhibit strong variations with offset and azimuth. For orebodies with complex shapes, the optimum shot location depends on the depth, dip, and strike of the target as well as the
receiver location. Large offsets between shots and downhole receivers may be necessary to image such complex, moderately dipping VMS deposits.
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| GEOSCAN ID | 211716 |
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