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A fractal (power-law) distribution is the only statistical distribution applicable to a scale-invariant process. One of the major problems in petrology is the distribution of trace elements in the Earth's crust. Extreme values of this distribution result in ore deposits. There is accumulating observational evidence that tonnage -grade statistics of ore deposits are often fractal (powerlaw). Rayleigh distillation and chromatographic models can explain power-law (fractal) distributions for thedoi:10.1016/s0024-4937(02)00194-9 fatcat:dxmat5dctrfhnjktivfwptx324