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14C Tephrochronology With Different Fractions of Paleosol Humic Matter at Procida Island, Italy

Published online by Cambridge University Press:  18 July 2016

Marisa Alessio ,
Lucia Allegri ,
Carlo Azzi ,
Gilberto Calderoni ,
Cesarina Cortesi ,
Salvatore Improta  and
Vincenzo Petrone
Marisa Alessio
Affiliation:
Department of Physics
Lucia Allegri
Affiliation:
Department of Physics
Carlo Azzi
Affiliation:
Department of Physics
Gilberto Calderoni
Affiliation:
Department of Earth Sciences, University “La Sapienza”, Rome, Italy
Cesarina Cortesi
Affiliation:
Department of Earth Sciences, University “La Sapienza”, Rome, Italy
Salvatore Improta
Affiliation:
Department of Physics
Vincenzo Petrone
Affiliation:
Department of Physics
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Abstract

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14C apparent ages along with δ13C values for three different fractions of humic matter (HM) isolated from a suite of four paleosols (PAs) interbedded within tephra are reported. The dated HM fractions were: 1) HA, the easily released humic acids; 2) HAtot, the bulk of humic acids; 3) RES, the insoluble HM. The 14C sequence dated from 13,000–25,000 BP, in agreement with stratigraphy and previous data. Age differences up to 2540±430 were statistically significant among fractions; their order of magnitude being independent from C content and depth. All the PAs showed a common pattern of among-fraction age variation, 14C aging trending from RES to HAtot through HA. As the HM fractions exhibited quite comparable δ13C values (δ13C = −25.4±0.2), it is inferred that the primitive organic matter (OM) input to PAs was dominantly supplied by vegetation of C-3 photosynthetic pathway which underwent complete decomposition during diagenesis.

Type
II. Carbon Cycle in the Environment
Information
Radiocarbon , Volume 31 , Issue 3: June 20-25, 1988 Dubrovnik, Yugoslavia , 1989 , pp. 664 - 671
Copyright
Copyright © The American Journal of Science 

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