14C Tephrochronology With Different Fractions of Paleosol Humic Matter at Procida Island, Italy. Issue 3 (18th July 2016)

• Record Type: Journal Article
• Authors: Alessio, Marisa; Allegri, Lucia; Azzi, Carlo; Calderoni, Gilberto; Cortesi, Cesarina; Improta, Salvatore; Petrone, Vincenzo
• Is Part Of: Radiocarbon. Volume 31:Issue 3(1988)
• Page Start: 664
• Page End: 671
• Publication Date: 2016-07-18
• Subjects: Radiocarbon dating -- Periodicals; 930.1028505
• DOI: 10.1017/S0033822200012261
• Languages: English
• ISSNs: 0033-8222

Abstract

Abstract : 14 C apparent ages along with δ 13 C 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 14 C 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, 14 C aging trending from RES to HAtot through HA. As the HM fractions exhibited quite comparable δ 13 C values (δ 13 C = −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.