Abstract

Progressive change in the ratio of the weight percentage of the anion radical to the cation radical as the fundamental control of sequence in deposition of minerals is the basic thesis of this paper. Evidence is given showing that oxide minerals are deposited in an " ideal" or " normal sequence " in such order that each mineral has a larger weight percentage in the anion radical than the next older mineral; sulphides are deposited after oxides with each younger sulphide having a smaller weight percentage in the anion radical than the next older mineral. Textures as a means of determining age relationships are discussed. Actual sequences of various classes of ore deposits are given and compared with the theoretical "normal sequence."

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