O registro climático e ambiental das conchas de sambaquis e depósitos paleolagunares na costa centro-sul Catarinense

Abstract

Aos malacólogos, Luiz Ricardo Simone (MZUSP) e Rodrigo César Marques (UFVJM), com a ajuda na identificação taxonômica e ecológica dos moluscos aqui estudados. Aos amigos do atemporal "Mocó" (a mítica e barulhenta sala 3 do Bloco C do IGc-USP) e adjacências,

ASSESSING THE 14C MARINE RESERVOIR EFFECT IN ARCHAEOLOGICAL CONTEXTS: DATA FROM THE CABEÇUDA SHELL MOUND IN SOUTHERN BRAZIL

“…This is also consistent with data presented by Casati (2019) and may be due to a lower marine influence in this period, possibly related to decreasing sea-level. According to Casati (2019), other possible influencing factors for this trend include the progressive closure of the connections between the lagoon and the sea due to siltation (Giannini et al 2010), increasing rainfall leading to enhanced fluvial input in the region (e.g., Cruz et al 2007;Bernal et al 2016) and the progradation of the Tubarão river delta increasing its influence in the lagoon (Nascimento 2010). It is here assumed that molluscs were collected from areas surrounding the site, and thus their δ 13 C and δ 18 O values would reflect local environmental conditions.…”

“…The δ 13 C and δ 18 O values for the Cabeçuda shells are in the range from 0.96 to 1.81‰ and from -1.35 to -0.31‰, respectively. These values are within the range found by Casati (2019) for several Anomalocardia shells from Cabeçuda and nearby sites. They are also broadly consistent with the modeled present-day values for the South Atlantic ocean (see Gruber et al 1999;LeGrande and Schmidt 2006;Tagliabue and Bopp 2008) and these two variables show no correlation in the set of samples analyzed in the present study (Figure 3a).…”