Natural geobatteries associated with sulphide ore deposits, II. Field studies at the viburnum trend, southeast Missouri, U.S.A. |
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| Authors: | Prokopis Sivenas Frank W Beales |
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| Institution: | Department of Geology, University of Toronto, Toronto, Ont. M5S2A1 Canada |
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| Abstract: | Any conductive sulphide ore body can generate electrical ore potentials and this can be regarded as a geobattery, with an upper positive cathode and a lower negative anode. Two mechanisms which can occur simultaneously and which appear to explain these potentials are the oxygen concentration cell (OCC) and the sulphide galvanic cell (SGC). When there is a difference of O2 concentration between the cathode and anode, the OCC operates by contributing oxygen to the anode, and ceases when the difference is diminished. However, gradients of pH, temperature or pressure can keep the cell operating. In the SGC the sulphides dissolve at the anode (producing metal ions, sulphur and electrons), while at the cathode, either sulphides dissolve producing metal and sulphur ions, or reaction is as in the OCC. The ore potential measured in the field is the sum of the oxygen concentration cell and at times locally dominant sulphide galvanic cells. |
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