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Marine Reservoir Effect Values from Shell-Middens of San Matías Gulf, Northern Patagonia (Argentina): A 5000-yr Record

Published online by Cambridge University Press:  11 December 2017

Cristián M Favier Dubois  and
A J Timothy Jull
Cristián M Favier Dubois*
Affiliation:
INCUAPA–CONICET–UNICEN, Departamento de Arqueología, Facultad de Ciencias Sociales, Avda. del Valle 5737, B7400JWI Olavarría, Prov. de Buenos Aires, Argentina
A J Timothy Jull
Affiliation:
2Department of Geosciences and AMS Laboratory, University of Arizona, Tucson, Arizona 85721 USA 3Isotope Climatology Research Centre, Institute of Nuclear Research, 4026 Debrecen, Hungary
*
*Corresponding author. Email: cfavier3@gmail.com.
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Abstract

Ten marine reservoir effect (R) values were obtained from archaeological shell-middens along the San Matías Gulf, North Patagonian Atlantic coast, Argentina. They were determined by accelerator mass spectrometry (AMS) measurements on marine shell (Mytilidae) and charcoal samples (burned, short-lived plants) derived from a common stratigraphic unit. The R values fluctuate between 205±48 and 358±56 14C yr BP from ca. 5300 to ca. 700 14C yr BP with no obvious temporal trend. Calculated ΔR values fluctuate between +30±66 and –162±48 yr during the same time span. Local factors such as restricted connection with the open sea or presence of aged carbonates do not appear to have had an influence on this effect along the gulf coastline. The mean R value obtained (266 ± 51 yr) constitutes a useful value for correcting ages in shells from abundant archaeological deposits recorded in the area since Middle Holocene times.

Keywords

marine reservoir effectMid-Late HoloceneMytilidaenorthern Patagonia
Type
Case Study
Information
Radiocarbon , Volume 60 , Issue 2 , April 2018 , pp. 419 - 424
Copyright
© 2017 by the Arizona Board of Regents on behalf of the University of Arizona 

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