Sea-level fall and coastal water cooling during the Late Holocene in Southeastern Brazil based on vermetid bioconstructions

Author(s)

Toniolo, Thiago de Freitas ^[1] ; Fonseca Giannini, Paulo Cesar ^[1] ; Angulo, Rodolfo Jose ^[2] ; de Souza, Maria Cristina ^[2] ; Ruiz Pessenda, Luiz Carlos ^[3] ; Spotorno-Oliveira, Paula ^[4]

Affiliation

^[1] Univ Sao Paulo, Inst Geociencias, Sao Paulo - Brazil

^[2] Univ Fed Parana, Dept Geol, Curitiba, Parana - Brazil

^[3] Univ Sao Paulo, Ctr Energia Nucl Agr, Sao Paulo - Brazil

^[4] Univ Fed Rio Grande, Inst Oceanog, Programa Posgrad Oceanol, Rio Grande, RS - Brazil

• Document type: Journal article
• Source: MARINE GEOLOGY; v. 428, OCT 2020.
• Web of Science Citations: 0

Abstract

The relative sea-level variation curve, obtained by dating and leveling vermetid shells from northern Santa Catarina State (26.3 degrees S), presents fall trend during all the last 4.0 cal ka BP, which matches previous results based on the same kind of indicator for the Brazilian coast between 3 degrees S and 28 degrees S. Chemical and isotopic analyses of 50 vermetid bioconstructions from distinct localities of south-southeastern Brazilian coast indicate possible changes in the coastal water temperature. These changes may have been caused by oscillations in the strength of Brazilian Coastal Current, which carries La Plata Plume northward, being therefore responsible for the penetration of cold and less saline water masses in the study area. This is a reasonable explanation for the scarcity of vermetid biolithites around 3.4-2.6 cal ka BP and 0.5-0 cal ka BP. (AU)

• FAPESP's process: 09/54232-4 - Morphodynamics and chronology of quaternary aeolian depositional systems in Brazil
• Grantee: Paulo César Fonseca Giannini
• Support Opportunities: Regular Research Grants
• FAPESP's process: 13/21941-8 - Use of fossil vermetids from São Francisco do Sul (SC) as indicators of relative sea level variation and to the discussion of coastal circulation along the Holocene
• Grantee: Thiago de Freitas Toniolo
• Support Opportunities: Scholarships in Brazil - Scientific Initiation