Dating constituent formation in soils to determine rates of soil processes: A review

Cornu, Sophie; Montagne, David; Vasconcelos, Paulo M.

doi:10.1016/j.geoderma.2009.08.006

Cited by 26 publications

(12 citation statements)

References 111 publications

(160 reference statements)

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“…During podzolization, a forest development induces a decrease in pH over time and a change in the organic matter entering the soils (e.g., Koerner et al, 1997;Temminghoff et al, 1998;Cornu et al, 2009). These processes -acidification, organic matter accumulation and Fe mobilization -contribute to the differentiation of typical Podzol horizons and their duration has been explored in a few studies.…”

Section: Dynamics Of Different Processes Involved In Podzolizationmentioning

confidence: 99%

Can Fe isotope fractionations trace the pedogenetic mechanisms involved in podzolization?

et al. 2017

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a b s t r a c t a r t i c l e i n f oStable Fe isotopes have shown the potential for tracing pedogenetic processes. Large isotopic fractionations were especially observed in Podzols. Nevertheless, a clear link between isotopic fractionation and elementary processes still needs to be established. To spatially distinguish the mechanisms successively involved in pedogenesis, we studied a podzolic chronosequence from Vancouver Island (British Columbia, Canada). We analyzed depth variations in soil properties (pH, particle size fractions, organic carbon, Si/Al ratio, Zr, Ti), Fe concentrations in different Fe pools, and Fe isotopic compositions. The Si/Al ratio, Zr, and Ti demonstrated that the Cox Bay Podzols developed from the same parental material, satisfying the requirements of a chronosequence. We showed that acidification, to a pH of 4.7, was a prerequisite for the start of podzolization. This first phase took place after 270 years. Furthermore, we observed that once the required pH was reached (4.7), podzolization occurred rapidly over 50 years. We found that Fe isotope fractionation in the A/E horizon was linked to mineral dissolution, while in the podzolic B horizons this fractionation was clearly associated with the accumulation of Fe-organic complexes and poorly crystalline Fe oxyhydroxides.

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Section: Dynamics Of Different Processes Involved In Podzolizationmentioning

confidence: 99%

Can Fe isotope fractionations trace the pedogenetic mechanisms involved in podzolization?

et al. 2017

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“…As a matter of fact, these weathering covers are composed of multiphased minerals for which the chronology has long been poorly documented (Cornu et al, 2009;Nahon, 2003). The first attempts of absolute dating of iron oxides by palaeomagnetism demonstrated that laterites could be older than expected (Cenozoic-Mesozoic) even if the method presented a relatively poor resolution (see e.g., Schmidt and Embleton, 1976).…”

Section: Introductionmentioning

confidence: 99%

“…The first attempts of absolute dating of iron oxides by palaeomagnetism demonstrated that laterites could be older than expected (Cenozoic-Mesozoic) even if the method presented a relatively poor resolution (see e.g., Schmidt and Embleton, 1976). In more recent times, three main new dating methods were developed that apply to secondary components of the soil and are consistent with geological time scales > 1 Ma (Cornu et al, 2009). The first one mainly relies on the measurement of the 40 Ar/ 39 Ar ratio on Kbearing manganese oxides, using laser ablation technique on single grains (Beauvais et al, 2008Bonnet et al, 2014Bonnet et al, , 2016Vasconcelos, 1999;Vasconcelos et al, 1994Vasconcelos et al, , 2013Vasconcelos et al, , 2015.…”

Section: Introductionmentioning

confidence: 99%

Combined dating of goethites and kaolinites from ferruginous duricrusts. Deciphering the Late Neogene erosion history of Central Amazonia

et al. 2018

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This study focuses on the dating of millimetric pisoliths from ferruginous duricrusts located in central Amazonia (Brazil), by coupling detailed mineralogy and two relevant dating methods: (i) (U-Th)/He analysis of goethites by mass spectrometry; (ii) analysis of radiation-induced defects of kaolinites embedded in duricrusts by electron paramagnetic resonance spectroscopy (EPR). Three samples collected at different elevations in the landscape were selected. The goethite corrected ages range from 1.1-15.2 Ma and consistently increase with elevation. EPR was performed on kaolinites after several cycles of a deferration procedure. Considering extreme geochemical scenarii, the ages of kaolinites are 1.7-7.1 Ma for a closed system and 4.0-16.7 Ma for an open system with 100% Rn loss. Ages of goethites and kaolinites are close, in the limit of the uncertainty of the methods. They show important periods of duricrust formation at Middle Miocene and at Late Miocene/Pliocene. Data allow the estimation of lowering rates between 3 and 8 m/Ma, in agreement with independent data available in the literature for the central Amazonia region or even for erosion of other cratons in the world. The two dating methods can be compared on common duricrust samples. By revealing single or multi-step weathering/erosion episodes related to relictual paleosurfaces, they also bring promising contributions to an advanced knowledge of ancient and complex lateritic geosystems.

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“…Global soil denudation rates (including but not limited to chemical weathering) can be assessed using cosmogenic nuclides like 10 Be (Heimsath et al, 1997(Heimsath et al, , 2000. Although some soil minerals can be dated with radiometric methods based on long-lived radionuclides, such as 40 Ar/ 39 Ar or U/Th-He, over a time scale of several ka (review in Cornu et al, 2009), recent (i.e.,<1 ka) processes are unable to be resolved with these methods. Over this shorter timescale, 14 C can be used to date the precipitation of pedogenic carbonates or organic matter accumulation (e.g.…”

Section: Introductionmentioning

confidence: 99%

Using short-lived nuclides of the U- and Th-series to probe the kinetics of colloid migration in forested soils

Rihs

Prunier

Thien

et al. 2011

Geochimica et Cosmochimica Acta

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Dating constituent formation in soils to determine rates of soil processes: A review

Cited by 26 publications

References 111 publications

Can Fe isotope fractionations trace the pedogenetic mechanisms involved in podzolization?

Can Fe isotope fractionations trace the pedogenetic mechanisms involved in podzolization?

Combined dating of goethites and kaolinites from ferruginous duricrusts. Deciphering the Late Neogene erosion history of Central Amazonia

Using short-lived nuclides of the U- and Th-series to probe the kinetics of colloid migration in forested soils

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