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HOLOCENE FLOODPLAIN LAKE-SEDIMENTS IN THE AMAZON - C-14 DATING AND PALEOECOLOGICAL USE
Tekijät: RASANEN ME, SALO JS, JUNGNER H
Kustantaja: PERGAMON-ELSEVIER SCIENCE LTD
Julkaisuvuosi: 1991
Journal: Quaternary Science Reviews
Tietokannassa oleva lehden nimi: QUATERNARY SCIENCE REVIEWS
Lehden akronyymi: QUATERNARY SCI REV
Vuosikerta: 10
Numero: 4
Aloitussivu: 363
Lopetussivu: 372
Sivujen määrä: 10
ISSN: 0277-3791
DOI: https://doi.org/10.1016/0277-3791(91)90037-U
Tiivistelmä
We think that the observed bias towards older C-14 ages documented in the gyttja clays is caused by the high proportion of old (fine particulate) organic matter being recirculated and resedimented within the suspension load, The strong fluvial control of lake sedimentation and the unreliability of the C-14 dates from the Amazon suspension-rich floodplains call for caution in palaeoecological interpretation. Furthermore, owing to the low number of within-lake replicate cores in the Amazon Holocene stratigraphy analyses, we consider the postulated Holocene climatic oscillation schemes to be tentative only.
We think that the observed bias towards older C-14 ages documented in the gyttja clays is caused by the high proportion of old (fine particulate) organic matter being recirculated and resedimented within the suspension load, The strong fluvial control of lake sedimentation and the unreliability of the C-14 dates from the Amazon suspension-rich floodplains call for caution in palaeoecological interpretation. Furthermore, owing to the low number of within-lake replicate cores in the Amazon Holocene stratigraphy analyses, we consider the postulated Holocene climatic oscillation schemes to be tentative only.
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