Paleosols record dry and humid paleoenvironments during the Upper Pleistocene in the Brazilian Pantanal

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Autor(es): dc.contributorUniversidade Estadual de Campinas (UNICAMP)-
Autor(es): dc.contributorUniversidade Estadual Paulista (UNESP)-
Autor(es): dc.contributorUniversidade de São Paulo (USP)-
Autor(es): dc.creatorLadeira, Francisco Sérgio Bernardes-
Autor(es): dc.creatorMescolotti, Patricia Colombo-
Autor(es): dc.creatordo Nascimento Pupim, Fabiano-
Autor(es): dc.creatorde Faria, Laura Milani Dias Mathias-
Autor(es): dc.creatorAssine, Mario Luis-
Data de aceite: dc.date.accessioned2025-08-21T18:30:18Z-
Data de disponibilização: dc.date.available2025-08-21T18:30:18Z-
Data de envio: dc.date.issued2022-05-01-
Data de envio: dc.date.issued2022-05-01-
Data de envio: dc.date.issued2022-05-01-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1016/j.catena.2022.106113-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/234264-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/234264-
Descrição: dc.descriptionInformation on Quaternary landscapes and paleoenvironmental changes in the interior of Brazil are scarce. One of such areas, particularly sensitive to these variations, is the modern tropical Pantanal wetland, whose alluvial deposits record paleoenvironmental and paleoclimatic changes during the late Quaternary. Based on detailed pedological and sedimentological descriptions, stimulated optical luminescence dating and analytical data we described a well-exposed sedimentary succession that crops out in slope terraces of the Aquidauana River, located in the southern area of the Pantanal. We interpret environmental changes that have occurred since the beginning of the Upper Pleistocene, and which affected sedimentation and biogeochemical processes. Basal deposits comprise cross-stratified sands, which record active fluvial sedimentation from ∼106 to ∼70 ka, a period of probable increased river discharge. Fluvial channel facies are overlaid by pedogeneized floodplain deposits, in which we recognized a pedocomplex composed of a sequence of three late Pleistocene truncated paleosol profiles and a Holocene soil profile. The two lower paleosols are Vertisols with mottling, slickensides, rhizolites and septarian glaebules of carbonate. These characteristics indicate prolonged drought periods under semi-arid to arid climates ca. ∼70 and ∼30 ka. The upper paleosol profile is a Planosol (Ultisol) with block structure, waxiness, iron glaebules, and manganese films, pointing to prevailing humid climates during the terminal Pleistocene (since ∼30 ka). Covering this truncated Planosol is a layer of fine to medium-grained Holocene sands, with development of a horizon A of an Arenosol (Entisol). These paleoenvironmental changes correlate with regional changes in precipitation deduced from speleothems in nearby plateaus and in southeastern Brazilian sites.-
Descrição: dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)-
Descrição: dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)-
Descrição: dc.descriptionLaboratory of Pedology (LabPed) Department of Geography Institute of Geosciences UNICAMP, R. Carlos Gomes, 250, São Paulo-
Descrição: dc.descriptionDepartament of Geology Institute of Geosciences and Exact Sciences-UNESP, Avenida 24A, 1515-
Descrição: dc.descriptionDepartment of Environmental Sciences Federal University of São Paulo, Diadema, Rua São Nicolau, 2010, São Paulo-
Descrição: dc.descriptionDepartament of Geology Institute of Geosciences and Exact Sciences-UNESP, Avenida 24A, 1515-
Descrição: dc.descriptionCNPq: # 432985/2018-2-
Descrição: dc.descriptionFAPESP: #2014/06889-2-
Idioma: dc.languageen-
Relação: dc.relationCatena-
???dc.source???: dc.sourceScopus-
Palavras-chave: dc.subjectOptically stimulated luminescence (OSL)-
Palavras-chave: dc.subjectPaleoclimate-
Palavras-chave: dc.subjectPedocomplex-
Título: dc.titlePaleosols record dry and humid paleoenvironments during the Upper Pleistocene in the Brazilian Pantanal-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

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