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• W2724528084 abstract "Este estudo teve como objetivo realizar a caracterizacao das condicoes paleoambientais na planicie aluvial do rio Iapo, com base em um testemunho sedimentar obtido na margem esquerda do rio, situado proximo a area urbana de Castro, PR. Para tanto, ressalta-se a utilizacao de diferentes dados proxies (analise multiproxy), como espiculas de esponjas continentais e fitolitos, associados a determinacao dos valores isotopicos de δ13C, δ15N, razao C/N, datacoes absolutas (14C) e analises granulometricas. Foi possivel a identificacao, via gemoscleras preservadas no deposito estudado, de taxons de esponjas de agua doce caracteristicos de ambiente lotico e lentico, alem da deteccao de exemplar vivo de Oncosclera schubarti Bonetto e Ezcurra de Drago, 1967, aderido em substrato rochoso do leito do rio Iapo. A datacao absoluta (14C) apresentou os seguintes resultados: 18.371 anos cal. AP. (114 cm) e 2.006 anos cal. AP. (72 cm), portanto, com idades que remontam ao Pleistoceno Superior e Holoceno Superior, respectivamente. Os dados obtidos permitiram caracterizar tres fases de evolucao paleoambiental: i) fase de canal ativo ha pelo menos 18 mil anos AP.; ii) fase de abandono de canal e inicio da formacao de um meandro abandonado, com depositos relacionados a evolucao de barras em pontal; iii) condicoes paleoclimaticas proximas as atuais na regiao, com a retomada da umidade na planicie e perturbacoes por pulsos de inundacao. Normal 0 false false false PT-BR X-NONE X-NONE /* Style Definitions */ table.MsoNormalTable {mso-style-name:Tabela normal; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-parent:; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin-top:0in; mso-para-margin-right:0in; mso-para-margin-bottom:10.0pt; mso-para-margin-left:0in; line-height:115%; mso-pagination:widow-orphan; font-size:11.0pt; font-family:Calibri,sans-serif; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-ansi-language:PT-BR;} A B S T R A C T The objective of this study was to characterize the paleoenvironmental conditions in the alluvial plain of the Iapo River, based on a sedimentary sample obtained on the left bank of the river, near the urban area of Castro in the state of Parana. To this end, different proxy methods were used (multiproxy analysis), such as: continental sponge spicules and phytoliths associated with the determination of δ 13C, δ 15N isotope values, C/N ratio, absolute dating (14C) and particle size analysis. It was possible to identify freshwater sponge taxa characteristic of lotic and lentic ecosystems via gemoscleres preserved in the studied sample. Living specimens of Oncosclera schubarti Bonetto and Ezcurra de Drago,1967, were also detected, adhering to a rocky substrate in the riverbed of the Iapo. The absolute dating (14C) yielded the following results: 18,371 cal years BP (114 cm) and 2,006 cal years BP (72 cm), therefore, with ages that go back to the Upper Pleistocene and Upper Holocene, respectively. The data obtained allowed for the characterization of three phases of paleoenvironmental evolution: i) an active channel phase for at least 18 thousand years BP; ii) a channel abandonment phase and the beginning of the formation of an abandoned meander, with deposits related to the evolution of point bars; iii) paleoclimatic conditions approximating the current ones in the region, with the recovery of the humidity in the plain and flood pulse disturbances. Keywords: Micropaleontology, Late Pleistocene, Holocene." @default.
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• W2724528084 date "2016-01-01" @default.
• W2724528084 modified "2023-10-02" @default.
• W2724528084 title "Quaternary paleoenvironments of the Iapó River Plain, Castro, Paraná" @default.
• W2724528084 doi "https://doi.org/10.5935/1984-2295.20160106" @default.
• W2724528084 hasPublicationYear "2016" @default.
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