Abstract
Three types of Au mineralization are known in the Ivalojoki area, in the southern part of the granulite complex of Lapland. These are epigenetic quartz-carbonate and quartz-hematite veins, the likely source of placer gold, and an arsenopyrite-bearing shear zone at Harrioja. The average Au content of the quartz-carbonate veins is 0.2 ppm, varying between 0.002 and 3.0 ppm; 2–6 ppm Au has been detected earlier in the Mäkärärova quartz-hematite vein. The maximum Au value in the Harrioja shear zone, where no placer gold has been found, is 0.4 ppm. Arsenic and Sb are both correlative with Au in veins and glacial till, as are Au and vein quartz in the till. The correlation between panned gold and instrumentally analyzed Au is low, as in most cases are the correlations between Au and other trace metals, till lithology and heavy minerals. The isotopic composition of trace lead from placer gold samples suggests the age of granulite metamorphism, but this may be spurious due to restricted sample material.
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