Climatically driven Quaternary sedimentation in a passive margin tropical context: Insights into the geomorphological evolution of Northeastern Brazil

Fonsêca, Drielly Naamma; de Barros Corrêa, Antonio Carlos; de Lira, Daniel Rodrigues; de Azevêdo Cavalcanti Tavares, Bruno; Torres, Bruno Araújo; Gonçalves, Rhandysson Barbosa; da Silva, Wermerson Flávio

doi:10.1016/j.geomorph.2024.109316

Geomorphology

2024

DOI: 10.1016/j.geomorph.2024.109316

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Climatically driven Quaternary sedimentation in a passive margin tropical context: Insights into the geomorphological evolution of Northeastern Brazil

Drielly Naamma Fonsêca,

Antonio Carlos de Barros Corrêa,

Daniel Rodrigues de Lira

et al.

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Sedimentological and geochemical proxies reveal changes in the South Atlantic Convergence Zone in Southeast South America during the Late-Holocene

de Mahiques,

Nagai,

Rodrigues Ventura

et al. 2024

The Holocene

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Today, the South Atlantic Convergence Zone (SACZ), a convective band that extends across central Brazil to the western South Atlantic Ocean, modulates Southern Hemisphere summer rainfall in Southeastern Brazil. During the Holocene, however, the role of the SACZ over the rainfall regime in this part of South America is still under debate. This study aims to provide new insights into the SACZ Late-Holocene variability through analysis of the geochemical (XRF-based bulk sediment Metal/Metal ratios) and sedimentological (grain size and end-member modeling) variations along four cores retrieved in a coastal area (24–49 m water depth) located in the core of modern SACZ. Our records show an increase in Ti/Ca ratios, suggesting increased rainfall and that the terrigenous input to the Brazilian southeastern inner shelf changed in the Late-Holocene (last 4200 years). These changes are also followed by a decrease in the K/Ti ratio, indicative of an increase in chemical weathering in the sediment source, and an increase in the Mn/Ti, suggesting an increase in oxidation. Additionally, decadal-scale variability with periodicities of 25 and 55 years obtained by a time-series (Redfit) analysis highlights a potential role of the Pacific Decadal Oscillation and the Atlantic Multidecadal Oscillation, respectively, as drivers of the SACZ variability over the last 4200 years.

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Sedimentological and geochemical proxies reveal changes in the South Atlantic Convergence Zone in Southeast South America during the Late-Holocene

de Mahiques,

Nagai,

Rodrigues Ventura

et al. 2024

The Holocene

View full text Add to dashboard Cite

show abstract

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Climatically driven Quaternary sedimentation in a passive margin tropical context: Insights into the geomorphological evolution of Northeastern Brazil

Cited by 1 publication

References 122 publications

Sedimentological and geochemical proxies reveal changes in the South Atlantic Convergence Zone in Southeast South America during the Late-Holocene

Sedimentological and geochemical proxies reveal changes in the South Atlantic Convergence Zone in Southeast South America during the Late-Holocene

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