Accuracy of post-bomb 137Cs and 14C in dating fluvial deposits
Quaternary Research
By: L.L. Ely, R. H. Webb, and Y. Enzel
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Abstract
The accuracy and precision of 137Cs and 14C for dating post-1950 alluvial deposits were evaluated for deposits from known floods on two rivers in Arizona. The presence of 137Cs reliably indicates that deposition occurred after intensive above-ground nuclear testing was initiated around 1950. There was a positive correlation between the measured level of 137Cs activity and the clay content of the sediments, although 137Cs was detected even in sandy flood sediments with low clay content. 137Cs is a valuable dating tool in arid environments where organic materials for 14C or tree-ring dating are scarce and observational records are limited. The 14C activity measured in different types of fine organic detritus yielded dates within 1 to 8 yr of a 1980 flood deposit, and the accuracy was species-dependent. However, undifferentiated mixtures of fine organic materials from several post-bomb deposits of various ages repeatedly yielded dates between 1958 and 1962, and detrital charcoal yielded a date range of 1676-1939. In semiarid environments, the residence time of most types of organic debris precludes accurate annual resolution of post-bomb 14C dates. ?? 1992.
Suggested Citation
Ely, L., Webb, R.H., and Enzel, Y., 1992, Accuracy of post-bomb 137Cs and 14C in dating fluvial deposits: Quaternary Research, v. 38, no. 2, p. 196-204, https://doi.org/10.1016/0033-5894(92)90056-O.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Accuracy of post-bomb 137Cs and 14C in dating fluvial deposits |
| Series title | Quaternary Research |
| DOI | 10.1016/0033-5894(92)90056-O |
| Volume | 38 |
| Issue | 2 |
| Year Published | 1992 |
| Language | English |
| Publisher | Elsevier |
| Publisher location | Amsterdam, Netherlands |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Quaternary Research |
| First page | 196 |
| Last page | 204 |