Abstract
The zoning typical of many sediment-hosted copper-iron sulfide deposits cannot be well accounted for by equilibrium approaches, which lead to inconsistencies and which are inherently ill-suited to describe a spatial, nonequilibrium process such as zoning. Much better is a kinetic approach that consists of differential equations representing dissolution, nucleation, growth, flow, and diffusion, all of which are clearly involved in ore genesis. In this kinetic model, time and spatial coordinates appear explicitly, and the equations automatically incorporate feedbacks among mechanisms. Numerical solutions of the equations for many combinations of reasonable values of the parameters involved (such as velocity and composition of the mineralizing water, equilibrium and reaction-rate constants, initial amount of pyrite in the rock, diffusion and nucleation constants, and others) can yield mineral zoning of several types, including the typical chalcocite-bornite-chalcopyrite-pyrite found at the White Pine deposit.
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Merino, E., Moore, C., Ortoleva, P., Ripley, E. (1986). Mineral Zoning in Sediment-Hosted Copper-Iron Sulfide Deposits — A Quantitative Kinetic Approach. In: Friedrich, G.H., Genkin, A.D., Naldrett, A.J., Ridge, J.D., Sillitoe, R.H., Vokes, F.M. (eds) Geology and Metallogeny of Copper Deposits. Special Publication No. 4 of the Society for Geology Applied to Mineral Deposits, vol 4. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-70902-9_40
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