Unreliability of 14 C Dates from Organic Matter of Soils
Contamination by recent carbon and the turnover of organic matter make dating of ancient soils difficult. In order to isolate the oldest organic fraction of sediments, two main extraction methods were previously proposed: 1) alkaline solubilization of humus that separates humins, humic acids, and fu...
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| Published in | Radiocarbon Vol. 22; no. 3; pp. 919 - 929 |
|---|---|
| Main Authors | , , |
| Format | Journal Article |
| Language | English |
| Published |
1980
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| Online Access | Get full text |
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| Abstract | Contamination by recent carbon and the turnover of organic matter make dating of ancient soils difficult. In order to isolate the oldest organic fraction of sediments, two main extraction methods were previously proposed: 1) alkaline solubilization of humus that separates humins, humic acids, and fulvic acids, and 2) successive hydrolyses that solubilize increasingly resisting products. Both preparation methods were tested on the same actual or fossil soils of different pedologic types from five geologic profiles on which other chronologic data are available.
Analytic results show that
14
C ages obtained from alkaline extraction products differ according to the duration of treatments and characteristics of soils: while hydrolysis should yield more homogeneous results and isolate oldest fractions. It seems likely that true ages of geologic formations were never obtained from their organic matter and that the oldest organic fraction, contemporaneous with the sediment formation, completely disappears. Thus, most ages from
14
C dating of organic matter of soils must be too recent. |
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| AbstractList | Contamination by recent carbon and the turnover of organic matter make dating of ancient soils difficult. In order to isolate the oldest organic fraction of sediments, two main extraction methods were previously proposed: 1) alkaline solubilization of humus that separates humins, humic acids, and fulvic acids, and 2) successive hydrolyses that solubilize increasingly resisting products. Both preparation methods were tested on the same actual or fossil soils of different pedologic types from five geologic profiles on which other chronologic data are available.
Analytic results show that
14
C ages obtained from alkaline extraction products differ according to the duration of treatments and characteristics of soils: while hydrolysis should yield more homogeneous results and isolate oldest fractions. It seems likely that true ages of geologic formations were never obtained from their organic matter and that the oldest organic fraction, contemporaneous with the sediment formation, completely disappears. Thus, most ages from
14
C dating of organic matter of soils must be too recent. |
| Author | Gilet-Blein, Nicole Marien, Gérard Evin, Jacques |
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| Cites_doi | 10.1038/202165a0 |
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| References | Scharpenseel (S0033822200010328_ref8) 1968 S0033822200010328_ref9 S0033822200010328_ref4 S0033822200010328_ref3 S0033822200010328_ref6 Jansson (S0033822200010328_ref2) 1968 Puisségur (S0033822200010328_ref7) 1976 Gilet (S0033822200010328_ref1) 1978 Paul (S0033822200010328_ref5) 1970; 3 |
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