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Geochemical evidence of the 8.2 ka event and other Holocene environmental changes recorded in paleolagoon sediments, southeastern Brazil

Published online by Cambridge University Press:  20 January 2017

Alethéa E.M. Sallun ,
William Sallun Filho ,
Kenitiro Suguio ,
Marly Babinski ,
Simone M.C.L. Gioia ,
Benjamin A. Harlow ,
Wania Duleba ,
Paulo E. De Oliveira ,
Maria Judite Garcia  and
Cinthia Z. Weber
...Show all authors
Alethéa E.M. Sallun*
Affiliation:
Instituto Geológico, Secretaria do Meio Ambiente do Estado de São Paulo, 04301-903 São Paulo, SP, Brazil
William Sallun Filho
Affiliation:
Instituto Geológico, Secretaria do Meio Ambiente do Estado de São Paulo, 04301-903 São Paulo, SP, Brazil Instituto de Geociências, Universidade de S"o Paulo, 05508-080 São Paulo, SP, Brazil
Kenitiro Suguio
Affiliation:
Instituto de Geociências, Universidade de S"o Paulo, 05508-080 São Paulo, SP, Brazil CEPPE, Universidade Guarulhos, 07023-070 Guarulhos, SP, Brazil
Marly Babinski
Affiliation:
Instituto de Geociências, Universidade de S"o Paulo, 05508-080 São Paulo, SP, Brazil
Simone M.C.L. Gioia
Affiliation:
Instituto de Geociências, Universidade de S"o Paulo, 05508-080 São Paulo, SP, Brazil
Benjamin A. Harlow
Affiliation:
Stable Isotope Core Laboratory, Washington State University, Pullman, WA 99164-4236, USA
Wania Duleba
Affiliation:
Instituto de Geociências, Universidade de S"o Paulo, 05508-080 São Paulo, SP, Brazil
Paulo E. De Oliveira
Affiliation:
CEPPE, Universidade Guarulhos, 07023-070 Guarulhos, SP, Brazil
Maria Judite Garcia
Affiliation:
CEPPE, Universidade Guarulhos, 07023-070 Guarulhos, SP, Brazil
Cinthia Z. Weber
Affiliation:
Instituto Geológico, Secretaria do Meio Ambiente do Estado de São Paulo, 04301-903 São Paulo, SP, Brazil
Sérgio R. Christofoletti
Affiliation:
Instituto Geológico, Secretaria do Meio Ambiente do Estado de São Paulo, 04301-903 São Paulo, SP, Brazil Instituto Florestal, Secretaria do Meio Ambiente do Estado de S"o Paulo, 13500-970, Rio Claro, SP, Brazil
Camilla da S. Santos
Affiliation:
CEPPE, Universidade Guarulhos, 07023-070 Guarulhos, SP, Brazil
Vanda B. de Medeiros
Affiliation:
CEPPE, Universidade Guarulhos, 07023-070 Guarulhos, SP, Brazil
Juliana B. Silva
Affiliation:
Instituto de Geociências, Universidade de S"o Paulo, 05508-080 São Paulo, SP, Brazil
Maria Cristina Santiago-Hussein
Affiliation:
CEPPE, Universidade Guarulhos, 07023-070 Guarulhos, SP, Brazil
Rosana S. Fernandes
Affiliation:
CEPPE, Universidade Guarulhos, 07023-070 Guarulhos, SP, Brazil
*
*Corresponding author at: Instituto Geológico, Secretaria do Meio Ambiente do Estado de São Paulo, Av. Miguel Stéfano 3900, Água Funda, 04301-903, São Paulo, SP, Brazil. E-mail address:alethea@igeologico.sp.gov.br (A.E.M. Sallun).
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Abstract

The paleoclimatic record of Juréia Paleolagoon, coastal southeastern Brazil, includes cyclic and gradual changes with different intensities and frequencies through geological time, and it is controlled by astronomical, geophysical, and geological phenomena. These variations are not due to one single cause, but they result from the interaction of several factors, which act at different temporal and spatial scales. Here, we describe paleoenvironmental evidence regarding climatic and sea level changes from the last 9400 cal yr BP at the Juréia Paleolagoon – one of the main groups of protected South Atlantic ecosystems. Geochemical evidences were used to identify anomalies from multi-proxy analyses of a paleolagoon sediment core. The anomalies of centennial scale were correlated to climate and transgression–regression cycles from the Holocene period. Decadal scale anomalous oscillations in the Quaternary paleolagoon sediments occur between 9400 and 7500 cal yr BP, correlated with long- and short-term natural events, which generated high sedimentation rates, mainly between 8385 and 8375 cal yr BP (10 cm/yr). Our results suggest that a modern-day short-duration North Atlantic climatic event, such as the 8.2 ka event, could affect the environmental equilibrium in South America and intensify the South American Summer Monsoon.

Keywords

QuaternaryGeochemistryPaleolagoon sedimentsSouth AmericaBrazil
Type
Original Articles
Information
Quaternary Research , Volume 77 , Issue 1 , January 2012 , pp. 31 - 43
Copyright
University of Washington

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