Genesis and Distribution of Low Fluvial Terraces Formed by Holocene Climate Pulses in Brazil

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Perez Filho, Archimedes ; Moreira, Vinicius B. ; Lammle, Luca ; Souza, Andre O. ; Torres, Bruno A. ; Aderaldo, Pedro I. C. ; Valezio, Everton V. ; Machado, David O. B. F. ; Prebianca, Mateus M. ; Mazoni, Alysson F. ; Zabini, Carolina ; Rubira, Felipe G.

• Document type: Journal article
• Source: WATER; v. 14, n. 19, p. 16-pg., 2022-10-01.

Abstract

Low fluvial terraces present azonal spatialization, encompassing several geomorphological compartments and climate zones in Brazil. Their genesis is directly related to river dynamics. When influenced by allogenic forces, such as Holocene climate pulses, it results in channel incision and posterior abandonment of the floodplain. Relatively plain landforms at different altimetric levels identified between the current floodplain and hillslope (low river terraces) are a result of these processes. Previous works using Optically Stimulated Luminescence (OSL) in low terraces of several rivers in Brazil have indicated morpho-chronologic similarities between depositional events, raising the hypothesis of feedbacks and fluvial adjustments relatively simultaneous to Holocene climate events. Considering these dynamics, this study employed OSL to obtain absolute dating information for 114 samples taken from distinct levels of the low river terraces of 30 rivers in Brazil, integrating the database of the IG-UNICAMP laboratory of Geomorphology and Environmental Analysis. Based on the data and statistical analysis (cluster and correlation analysis), this study aimed to identify relationships between different variables which might have controlled spatial homogenous and heterogeneous feedbacks during distinct paleoenvironmental contexts. The proposed methodology tested a fundamental hypothesis of the regional climatic geomorphology, and the results obtained may contribute to future discussions on the relationship between low river terraces and anthropic occupation. (AU)

• FAPESP's process: 15/10417-1 - Geochronology of veredas and campos de murundus environments on the Uberlândia - Uberaba plateau : implications for landscape development
• Grantee: Vinícius Borges Moreira
• Support Opportunities: Scholarships in Brazil - Master
• FAPESP's process: 21/05823-1 - Advanced big data analysis for Science and innovation policy analysis
• Grantee: Alysson Fernandes Mazoni
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
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• Grantee: André de Oliveira Souza
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 16/08944-6 - SPATIAL DISTRIBUTION AND GEOCHRONOLOGY OF SURFACE COATINGS IN LOW MARINE, RIVER-MARINE AND RIVER TERRACES, AT THE MOUTH OF THE RIVER BASINS OF ITAPOCU AND ARARANGUÁ (SC), ARISING OUT MARINE TRANSGRESSIONS AND REGRESSIONS EPIDODES ASSOCIATED OF CLIMATE FLU
• Grantee: Felipe Gomes Rubira
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 13/24885-1 - Equilibrium in geomorphology: geosystems, floodplains and morfodynamic of Jacaré-Pepira and Jacaré-Guaçu rivers/SP
• Grantee: Éverton Vinícius Valezio
• Support Opportunities: Scholarships in Brazil - Master
• FAPESP's process: 12/00145-6 - Landscape evolution and geocronology of Depressão Periférica and Planalto Ocidental Paulista relief
• Grantee: Archimedes Perez Filho
• Support Opportunities: Regular Research Grants
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• Grantee: André de Oliveira Souza
• Support Opportunities: Scholarships in Brazil - Master
• FAPESP's process: 16/05327-6 - Spatial distribution and geochronology of surface coatings in marine, river- marine and river terraces in the context of climate fluctuations, associated to the Holocene's marine transgression and regression episodes in the Brazilian coast
• Grantee: Archimedes Perez Filho
• Support Opportunities: Regular Research Grants
• FAPESP's process: 16/24390-0 - Geomorphological evolution of lower river terraces and abandoned meanders of an alluvial segment of the Jacaré-Guaçu river (São Paulo, Brazil)
• Grantee: Éverton Vinícius Valezio
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 19/23452-0 - Fluvial dynamics related to the formation of low fluvial terraces, in the medium course of Rio Grande, west of Bahia, Brazil, associated with holocenic climate pulses
• Grantee: Mateus Moriconi Prebianca
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• FAPESP's process: 18/07271-3 - Marine transgressions and regressions associated to Holocene climate pulsations: spacialization and geochronology of surface coverages in fluvial, fluvial-marine and marine terraces in the Brazilian coast
• Grantee: Archimedes Perez Filho
• Support Opportunities: Regular Research Grants
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• Grantee: Luca Lämmle
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 18/23828-8 - Geocronology of surface coverings at levels of low terraces, related to marine transgressions and regressions, associated with holoceniC climate pulses, in the low Apodi-Mossoró River course
• Grantee: Pedro Ítalo Carvalho Aderaldo
• Support Opportunities: Scholarships in Brazil - Doctorate