Please use this identifier to cite or link to this item: http://repositorio.ufla.br/jspui/handle/1/29949
metadata.artigo.dc.title: Geochemistry of upland lacustrine sediments from Serra dos Carajás, Southeastern Amazon, Brazil: Implications for catchment weathering, provenance, and sedimentary processes
metadata.artigo.dc.creator: Sahoo, Prafulla Kumar
Guimarães, José Tasso Felix
Souza-Filho, Pedro Walfir Martins
Silva, Marcio Sousa da
Maurity, Clovis Wagner
Powell, Mike A.
Rodrigues, Tarcísio Magevski
Silva, Delmo Fonseca da
Mardegan, Sílvia Fernanda
Furtini Neto, Antonio Eduardo
Dall'agnol, Roberto
metadata.artigo.dc.subject: Lake sediments
Elemental and isotope geochemistry
Provenance and weathering
Sedimentary process
Serra dos Carajás
metadata.artigo.dc.publisher: Elsevier
metadata.artigo.dc.date.issued: Dec-2016
metadata.artigo.dc.identifier.citation: SAHOO, 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.
metadata.artigo.dc.description.abstract: A 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.
metadata.artigo.dc.identifier.uri: https://www.sciencedirect.com/science/article/pii/S0895981116301730
http://repositorio.ufla.br/jspui/handle/1/29949
metadata.artigo.dc.language: en_US
Appears in Collections:DCS - Artigos publicados em periódicos

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