INFLUENCE OF BASIC MATERIAL ON SOIL GENESIS IN THE THETFORD–BLACK LAKE AREA, PROVINCE OF QUEBEC

Four profiles were sampled near the contact between the acidic and the ultramafites deposits. One profile was derived from serpentine rock whereas the three others were derived from till. Reworking of surface layers by the glacial processes and the input of dust from mining operations resulted in a slowing down process in the podzolic evolution. pH values were high and base saturation level in the B horizons reached 100%.