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Radiocarbon Reservoir Ages and Hardwater Effect for the Northeastern Coastal Waters of Argentina

Published online by Cambridge University Press:  18 July 2016

Eduardo A Gómez ,
C Marcela Borel ,
Marina L Aguirre  and
Daniel E Martínez
Eduardo A Gómez*
Affiliation:
Instituto Argentino de Oceanografía (CONICET-UNS), Camino “La Carrindanga” km 7, CC 804, 8000 Bahía Blanca, Argentina. Also: UTN Facultad Regional Bahía Blanca, 11 de Abril 461, 8000 Bahía Blanca, Argentina
C Marcela Borel
Affiliation:
CONICET, Departamento de Geología, Universidad Nacional del Sur. San Juan 670, 8000 Bahía Blanca, Argentina
Marina L Aguirre
Affiliation:
INGEA CONICET, Laboratorio 6 (Malacofauna Cuaternaria), Facultad de Ciencias Naturales y Museo, Calle 64 no. 3 (119 y 120), 1900 La Plata, Argentina
Daniel E Martínez
Affiliation:
CONICET-Centro de Geología de Costas y del Cuaternario, Universidad Nacional de Mar del Plata, CC 722, 7600 Mar del Plata, Argentina
*
Corresponding author. Email: gmgomez@criba.edu.ar
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Abstract

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Accelerator mass spectrometry (AMS) radiocarbon dates were obtained for 18 mollusk shells collected alive along the Buenos Aires province coast, Argentina, over the period AD 1914–1935. Reservoir ages were estimated for all samples on the basis of the tree-ring calibration curve for the Southern Hemisphere (SHCal04, McCormac et al. 2004) and the marine δR values calculated as the difference between the conventional 14C age and the age deduced from the marine, mixed-layer model calculation (Marine04, Hughen et al. 2004). For most coastal locations, a great δR scatter was observed, ranging from 191 to 2482 yr, which is explained by the input of varying content of dissolved carbonate by rivers and groundwater (“hardwater effect”) and indicates a serious limitation for shell-based 14C chronologies. Within the interior of Bahía Blanca estuary, δR values ranged from −40 to 50 ± 46 as a consequence of the local geological particularities of the environment. This suggests that, with some restrictions, the marine calibration curve with standard parameters (δR = 0) could be used at this location.

Information

Type
Articles
Information
Radiocarbon , Volume 50 , Issue 1 , 2008 , pp. 119 - 129
Copyright
Copyright © 2008 by the Arizona Board of Regents on behalf of the University of Arizona 

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