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Dynamic weathering model; constraints required by coupled dissolution and pseudomorphic replacement

, : Dynamic weathering model; constraints required by coupled dissolution and pseudomorphic replacement. Geochimica et Cosmochimica Acta 59(8): 1559-1570

In lateritic weathering parent mineral grains are partly replaced by oxides and oxyhydroxides and partly congruently dissolved. The replacement of a parent grain by an oxide at a site results from the physical coupling of oxide growth and parent-grain dissolution: the stress between the growing oxide and an adjacent parent grain makes the volumetric rates of the two “half-reactions” equal to each other, which yields the constant volume characteristic of pseudomorphic replacement.


DOI: 10.1016/0016-7037(95)00062-5

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