Formation and stability of Fe oxides are governed by specific pedoenvironmental conditions, which makes the oxides useful indicators for pedoenvironmental and
pedogenetic processes (KAMPF & CURI, 2000).
This matrix of possible effects will contribute to the persistence of the pellet morphology in the soil fabric and to the
pedogenetic changes and post-depositional weathering that will modify the initially deposited fabric.
The degree of soil stability under different land uses is correlated with the importance of the formation and accumulation of
pedogenetic maghemite in the superficial soil horizons.
Da Silva Terra, "Spectral pedology: a new perspective on evaluation of soils along
pedogenetic alterations," Geoderma, vol.
Morphological analysis showed that the studied soil profile has higher clay content in the Bt horizon than in the E horizons as a result of
pedogenetic processes.
The textural differentiation might be caused by an illuvial accumulation of clay, predominant
pedogenetic formation of clay in the subsoil, destruction of clay in the surface horizon, selective surface erosion of clay, upward movement of coarser particles due to swelling and shrinking, biological activity, and a combination of two or more of these different processes [18].
When occurring naturally in the soil environment as a consequence of the
pedogenetic processes of weathering of parent materials, their contents are at levels that are considered to be trace (<1000mg/kg) [2].
This is typical of Sardinia during this period (Scanu et al., 2014), and is thus unmistakable with respect to other emersion periods of different ages and showing diverse features: e.g., the Permian emersion periods are never marked by
pedogenetic processes.
This is not a minor issue, as formal definition of gypsisols "soils with a significant accumulation of
pedogenetic gypsum (CaS[O.sub.4] x 2[H.sub.2]O) in the solum" (Driessen & al., 2001), is ambiguous.
student in 1963 and presents the thesis about the "
Pedogenetic Formations and the Quaternary Deposits in Central and South Dobrogea--A Paleogeographic and Paleopedological Study" (p.