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Sources of iron oxides in reddish brown soil profiles from calcarenites in Southern Spain

1986; Elsevier BV; Volume: 37; Issue: 1 Linguagem: Inglês

10.1016/0016-7061(86)90043-1

1872-6259

J. Torrent, A. Cabedo,

Soil and Unsaturated Flow

We studied the distribution with depth of the different forms of iron in two reddish brown (rubified) soils developed on hematite-free calcarenites in the Province of Córdoba, southern Spain. Hematite appeared in significant amounts in the A and B horizons of the soils and seemed to have originated mainly from the weathering of the Fe-bearing clay minerals (smectites). Because of their low contents of Fe, both the non-clay fraction and the carbonate of the parent material contributed little to Fe-oxide formation. The distribution with depth of goethite in the clay fractions suggested that part of the initial goethite had been lost and might have been altered to hematite.