INTEGRATED SEISMIC-REFLECTION AND BOREHOLE GEOPHYSICAL STUDIES AT LES-MINES-SELBAIE, QUEBEC

Integrating seismic reflection, borehole geophysical, and physical roc k property studies is an effective means of mapping lithological conta cts and structures in the crystalline crust. At Les Mines Selbaie in t he northern volcanic zone of the Late Archean Abitibi Subprovince, a h igh-frequency seismic reflection profile has provided the first images of deep crustal structures of this important polymetallic mine site. Physical rock property and borehole geophysical studies confirm that p rominent seismic reflections can be caused by lithological contacts, f aults and sulphide mineralization. At Les Mines Selbaie, the first two of these are shown by this study. Clearly identifiable reflection ima ges from sulphide mineralization have not been demonstrated in analysi s of the profile The seismic images provide useful information about g ross structure in the vicinity of Les Mines Selbaie. They can also pla ce important constraints on the sequence of tectonic events and, there fore, can aid future deep exploration programs.