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dc.creatorSahoo, Prafulla Kumar-
dc.creatorGuimarães, José Tasso Felix-
dc.creatorSouza-Filho, Pedro Walfir Martins-
dc.creatorSilva, Marcio Sousa da-
dc.creatorMaurity, Clovis Wagner-
dc.creatorPowell, Mike A.-
dc.creatorRodrigues, Tarcísio Magevski-
dc.creatorSilva, Delmo Fonseca da-
dc.creatorMardegan, Sílvia Fernanda-
dc.creatorFurtini Neto, Antonio Eduardo-
dc.creatorDall'agnol, Roberto-
dc.date.accessioned2018-08-10T18:27:58Z-
dc.date.available2018-08-10T18:27:58Z-
dc.date.issued2016-12-
dc.identifier.citationSAHOO, P. K. et al. Geochemistry of upland lacustrine sediments from Serra dos Carajás, Southeastern Amazon, Brazil: Implications for catchment weathering, provenance, and sedimentary processes. Journal of South American Earth Sciences, [S.l.], v. 72, p. 178-190, Dec. 2016.pt_BR
dc.identifier.urihttps://www.sciencedirect.com/science/article/pii/S0895981116301730pt_BR
dc.identifier.urihttp://repositorio.ufla.br/jspui/handle/1/29949-
dc.description.abstractA multi-proxy geochemical study of surficial sediments of an upland lake (Amendoim Lake), located in the Serra dos Carajás region, Brazil, was carried out to understand catchment weathering and provenance of sediments in the basin, as well as sedimentary processes. The carbon and nitrogen isotopic compositions of organic matter in the sediment were quite homogeneous, and suggest that the organic sources for this lake are mainly composed of palms and submerged macrophytes. The R-mode factor analysis indicates that most of the trace elements, including rare earth elements (REEs), are clustered with Al (Group 1), Si is grouped with Zr and Hf (Group 4), total organic carbon (TOC) with TS and Hg (Group 2), and Fe with Mn and As (Group 3). The elements of the Group 1 show strong positive correlations with Al, suggesting that these elements are hosted in detrital minerals during laterization in the catchment basin and not significantly affected by diagenesis. The high CIA values (96–99) of sediments together with their position in A-CN-K and log (Fe2O3/K2O) vs log (SiO2/Al2O3) plots indicate intense chemical weathering in source area. However, similar geochemical signatures between lake sediments and catchment lateritic crust indicates that mechanical erosion was the dominant sediment formation process. REE patterns normalized to chondrite along with geochemical indices (Al/K, Al/Ti, La/Th, La/Al, Ti/Zr, Zr/Hf, Th/Sc, Co/Th, Ba/Sr, and Eu/Eu*) also indicate that the sediments are mainly derived from laterite crust. This study provides reliable background information to reconstruct weathering processes and lake evolution in the Serra dos Carajás area.pt_BR
dc.languageen_USpt_BR
dc.publisherElsevierpt_BR
dc.rightsrestrictAccesspt_BR
dc.sourceJournal of South American Earth Sciencespt_BR
dc.subjectLake sedimentspt_BR
dc.subjectElemental and isotope geochemistrypt_BR
dc.subjectProvenance and weatheringpt_BR
dc.subjectSedimentary processpt_BR
dc.subjectSerra dos Carajáspt_BR
dc.titleGeochemistry of upland lacustrine sediments from Serra dos Carajás, Southeastern Amazon, Brazil: Implications for catchment weathering, provenance, and sedimentary processespt_BR
dc.typeArtigopt_BR
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