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Economic Geology; November 1966; v. 61; no. 7; p. 1266-1271
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Application of the potential-pH diagrams to characteristics of some Zechstein copper deposits

J. Serkies, F. Letowski, and J. Niemiec

Using an Eh-pH diagram for the system Cu-Fe-S-O-CO 2 , at 25 degrees C, pressure of 1 atm, and assumed activities of Cu, Fe, S, and CO 2 , the Eh (potential) at any given horizon can be estimated from the mineral phases present. The amount of copper present is inversely proportional to the potential, and calcium is directly proportional. The rates of change in these amounts, when plotted against potential, increase toward the Zechstein (Permian) basin in Poland. When potential is plotted against stratigraphic position, it shows considerable fluctuation; such diagrams are helpful in comparing mineralogy with lithologic characteristics.

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