Acoustic velocity logging at the McConnell nickel deposit, Sudbury area, Ontario: preliminary in situ measurements

Abstract

An acoustic velocity logging probe has been used to acquire data on the seismic characteristics of the McConnell nickel deposit in the Sudbury area. Preliminary results indicate good velocity contrasts in the stratigraphic sequence associated with the massive sulphides. These velocity contrasts are related to the density and elastic properties of the rocks; density was measured in the same borehole with a density logging probe. One interesting observation is that the high density massive sulphides have low P-wave velocities relative to the host rocks. This is not a universally applicable condition because some massive sulphides in other areas being investigated have higher velocities. Full sonic waveforms were recorded and these will be further studied to extract S-wave velocities. The P- and S-wave velocity and amplitude logs will then be used to derive valuable geotechnical information.

Combined 3‐D Interpretation of Airborne, Surface, and Borehole Vector Magnetics at the McConnell Nickel Deposit

“…The massive sulphides are bounded, generally at the top, by quartz diorite dikes (the elliptical quartz diorite pods of the McConnell offset dike). Sulphides are also found in the surrounding schists, amphibolites, conglomerates, metasediments, Sudbury breccia, and quartz diorite dikes (Pflug et al, 1994).…”

Combined 3‐D interpretation of airborne, surface, and borehole vector magnetics at the McConnell Nickel deposit

“…Most of the rock units overlying the ore body consist of metasediments and conglomerates. The massive sulphides are bounded, generally at the top, by quartz diorite dikes (the elliptical quartz diorite pods of the McConnell offset dike), but sulphides are found in the surrounding schists, amphibolites, conglomerates, metasediments, Sudbury breccia, and quartz diorite dikes (Pflug et al, 1994).…”