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Aeromagnetic data collected along 200-m-spaced lines at 120-m terrain clearance in the Matagami area of Quebec have been used to improve geological understanding in an area where bedrock is almost completely covered with overburden. The use of the apparent-susceptibility technique has reduced anomaly overlap and has led directly to the use of rock-type susceptibility as a mapping tool.

Volcanic rocks in the area are clearly divided into magnetic (6.0 × 10-2 SI) and weakly magnetic (4.0 × 10-3 SI) units. Chemical analysis of major elements shows that both units are iron-rich tholeiites with virtually the same bulk chemistry. The original oxygen fugacity and temperature of the source magma are thus proposed as the controlling factors influencing the magnetic character of the volcanic rocks.

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