Ein Beitrag zur Entstehung der Mediterran-Roterde vom Standpunkt kolloidchemischer Bodenforschung und klimatischer Bodenzonenlehre

Evidence for isovolumetric replacement in some Terra Rossa profiles of northern Jordan

“…In this context, Blanck (1915Blanck ( , 1916Blanck ( , 1926, Blanck and Scheffer (1926), Blanck et al ( , 1928, and Blanck and Oldershausen (1936) suggested that metasomatism offers an explanation for the distribution of Terrae Rossae in Europe. Based on Regny's (1904) considerations on the role of iron precipitation from Terra Rossa soil water, Blanck's (1915) model of iron diffusion into the pores of calcareous rocks assumed that iron precipitation out of the soil water led to the replacement of limestone in a pressure-driven reaction which produced acids that further dissolved calcium carbonate, essentially resembling processes of laterite formation.…”

“…According to Blanck (1915Blanck ( , 1916 and , the small humus contents are decisive for the dominating formation of red soils on calcareous rocks in Mediterranean climates, and explain why red soils are largely absent on calcareous rocks of temperate zones. In areas with soils rich in humus, like calcareous rocks in temperate zones, the soil water is saturated with organic acids providing a "colloid" that prevents iron from precipitating even when in contact with calcareous rocks.…”