Journal
QUATERNARY GEOCHRONOLOGY
Volume 35, Issue -, Pages 36-42Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.quageo.2016.05.003
Keywords
Shellmound; Radiocarbon; Terrestrial snails; Marine reservoir effect; Upwelling
Funding
- Brazilian financial agency CNPq (Conselho Nacional de Desenvolvimento Cientifico e Tecnologico) [305079/2014-0]
- Brazilian financial agency CAPES (Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior) [99999.005288/2014-02]
- Brazilian financial agency FAPERJ (Fundacao de Amparo a Pesquisa do Estado do Rio de Janeiro) [E-26/111.278/2014, E-26/110.138/2014]
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The mixture of different water masses can strongly influence the marine reservoir effect (MRE) in localities under the effect of coastal marine upwelling. The Cabo Frio region, on the southeastern Brazilian coast, is well known for its seasonal marine upwelling and for its rich landscape of Holocene shell mounds. In this kind of archaeological settlement, common on the southern and southeastern Brazilian coasts, marine mollusk shells are frequently used for radiocarbon dating and can represent a valuable tool in the study of MRE. On the other hand, terrestrial mollusks have proven to be an important alternative to represent the atmospheric carbon isotopic concentration. In this work we analysed the most frequent terrestrial and marine mollusk shells from the Usiminas shellmound, on Cabo Frio Island. The radiocarbon signal of marine shells from Pinctada imbricata (Roding, 1798), Ostreidae (Rafinesque, 1815), Cymathium parthenopeum (Von Salis, 1793), Leucozonia nassa (Gmelin, 1791), Lithopoma olfersii (Philippi, 1846), and that of terrestrial shells from Thaumastus achilles (Pfeiffer, 1852) and Megalobulimus terrestris (Spix, 1827), collected from the archaeological layers in the sequence, were measured and a value of 67 +/- 33 C-14 yr was obtained for the local offset from the average global marine reservoir age. The effect of upwelling in this region and in its surrounding area is discussed. (C) 2016 Elsevier B.V. All rights reserved.
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