Abstract

Specimens of marbles, limestones, and travertine, heated at one atmosphere and at 5000 and 10,000 lb/in2 confining pressures, all showed permanent expansion, and of the same order of magnitude even at the highest pressure. Permeability of samples to water solutions (red and blue inks) increased markedly with heating. The mechanism may explain apparent high permeability of carbonate rocks to ore‐bearing solutions when these same rocks have very low permeabilities at room temperatures.

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