Hypothesis of replacement from magmatic solutions

This hypothesis was adopted by Ries and Bowen. They were in some doubt whether the replacement preceded or followed the folding of the limestone but decided it preceded the folding. According to them the "primary" minerals—willemite, franklinite, and zincite—were deposited directly, in the order given, from magmatic solutions. The chemical nature of these minerals is such that it seems unlikely to the author that they originated through deposition from magmatic solutions. As far as he is aware, wherever zinc ores have indubitably been so deposited, it was the sulphide that was formed, and the absence of metallic sulphides is one of the characteristics of the primary ores of the Franklin district.


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