Abstract

The statistical analysis of chemical data by Lepp and Goldich (Econ. Geology, v. 59, p. 1025-1060, 1964) does not adequately support their conclusions because (1) it excludes post-Precambrian cherty iron formation and Precambrian minette types; (2) in attributing apparent uniformity to control in some areas, it ignores geologic evidence such as that suggesting contemporaneous vulcanism; (3) it does not satisfactorily demonstrate that significant replacement of calcium carbonate by silica has actually occurred; and (4) the assumption that the iron-calcium ratio of source areas is the same as that of the lithosphere is not necessarily valid.

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