Co-Authors:
Fine, P., Inst. of Soils & Water, ARO, The Volcani Center, Bet Dagan 50250, Israel
Singer, M.J., Inst. of Soils & Water, ARO, The Volcani Center, Bet Dagan 50250, Israel
Verosub, K.L., Inst. of Soils & Water, ARO, The Volcani Center, Bet Dagan 50250, Israel
Abstract:
It is suggested that the continuous pedogenic development of a soil profile in homogeneous parent material results in enhancement of magnetic susceptibility (MS) and in a gradual shift from multidomain to single domain and super-paramagnetic states, and that deviations from this pattern arise from discontinuities in the soil or from climatic or topographic changes. This hypothesis was tested on 18 northern California pedons, formed in four marine and river terrace systems and in volcanic parent material. Established chronosequence members were used to determine that enhancement of MS and shifts in magnetic domain state are correlated with age. Exceptionally large or small magnetic enhancement, and discontinuous magnetic profiles in other soils could each be related to morphologically or chemically determined discontinuities. Thus, magnetic susceptibility can be used to evaluate the suitability of pedons for chronosequence studies. -from Authors
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