Journal ArticleDOI
Delivery and deposition of organic matter in surface sediments of Lagoa do Caçó (Brazil)
Abdelfettah Sifeddine,Philip A. Meyers,Renato Campello Cordeiro,Renato Campello Cordeiro,Renato Campello Cordeiro,Ana Luiza Spadano Albuquerque,Ana Luiza Spadano Albuquerque,Ana Luiza Spadano Albuquerque,Marcelo Bernardes,Marcelo Bernardes,Marcelo Bernardes,Bruno Turcq,Jorge Abrao,Jorge Abrao,Jorge Abrao +14 more
TLDR
The depth-related processes that affect the production and deposition of sedimentary organic matter in Lagoa do Caco (Brazil) were analyzed to identify the depthrelated processes as discussed by the authors.Abstract:
Elemental and isotopic compositions of organic matter in surficial sediments from five transects across Lagoa do Caco (Brazil) were analyzed to identify the depth-related processes that affect the production and deposition of sedimentary organic matter in this shallow tropical lake. Each of four transverse transects began at a margin dominated by aquatic macrophytes (Eleocharis), crossed the central deep part of the lake, and terminated in the opposite, macrophyte-dominated margin. In each transect, TOC concentrations, C/N ratios, and δ13C values decreased between 0 and 4 m, whereas δ15N values increased. The variables remained stable in sediment from 4 m water depth to the center of the lake at 10 m. The depth-related patterns reflect differences in both the delivery and the deposition of organic matter in the lake. Organic matter is produced in abundance in the marginal area by emersed and submerged macrophyte vegetation that diminishes with depth and disappears at 4 meters. After the disappearance of macrophytes, organic matter is produced at low rates principally by open-lake phytoplankton. Drawdown of dissolved oxygen is high in the lake margins, but it is low in the oligotrophic open waters of the lake. Preservation of organic matter is consequently better in sediments of the lake margins than in deep waters. The depth-related pattern of organic matter delivery and deposition in the sediments of Lagoa do Caco, in which water levels are sensitive to groundwater fluctuations, shows that the elemental and isotopic compositions of sediment organic matter can provide a record of changes in the paleohydrology of this and other similar shallow lake systems.read more
Citations
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Journal ArticleDOI
Geochemistry of upland lacustrine sediments from Serra dos Carajás, Southeastern Amazon, Brazil: Implications for catchment weathering, provenance, and sedimentary processes
Prafulla Kumar Sahoo,José Tasso Felix Guimarães,Pedro Walfir M. Souza-Filho,Marcio Sousa da Silva,Clovis Wagner Maurity,Michael Powell,Tarcísio Magevski Rodrigues,Delmo Fonseca da Silva,Silvia Fernanda Mardegan,Antonio Eduardo Furtini Neto,Roberto Dall'Agnol +10 more
TL;DR: In this article, a multi-proxy geochemical study of surficial sediments of an upland lake (Amendoim Lake), located in the Serra dos Carajas region, Brazil, was carried out to understand catchment weathering and provenance of sediments in the basin, as well as sedimentary processes.
Journal ArticleDOI
Late Holocene paleoenvironmental changes in Northeast Brazil recorded by organic matter in lacustrine sediments of Lake Boqueirão
Renata Zocatelli,Bruno Turcq,Mohammed Boussafir,Renato Campello Cordeiro,Jean-Robert Disnar,Renata Lima Costa,Abdelfettah Sifeddine,Ana Luiza Spadano Albuquerque,Marcelo Bernardes,Jérémy Jacob +9 more
TL;DR: In this article, the authors studied the lacustrine sediments of Lake Boqueirao, which is located at 5°S latitude on the Brazilian Atlantic coast; it is directly influenced by displacement of the Intertropical Convergence Zone (ITCZ).
Journal ArticleDOI
A 15.4-ka paleoclimate record inferred from δ13C and δ15N of organic matter in sediments from the sub-alpine Daping Swamp, western Nanling Mountains, South China
Wei Zhong,Zhiqiang Wei,Yu Chen,Shengtan Shang,Jibin Xue,Jun Ouyang,Jiayuan Cao,Bin Chen,Chan Zhu +8 more
TL;DR: This paper inferred past climate conditions from the δ13C and δ15N of organic matter (OM) in a sediment core (DP-2011-02) from the sub-alpine Daping Swamp, in the western Nanling Mountains, South China.
Journal ArticleDOI
Paleoseismic record obtained by coring a sag-pond along the North Anatolian Fault (Turkey)
Aurélia Hubert-Ferrari,Ulas Avsar,Meriam El Ouahabi,Gilles Lepoint,Philippe Martinez,Nathalie Fagel +5 more
TL;DR: In this article, a 2m-deep, 700m-long lake that is cross-cut by the North Anatolian Fault contains a reliable paleoseimological record that can be obtained through coring.
Journal ArticleDOI
Mercury accumulation rates in Caço Lake, NE Brazil during the past 20.000 years
Luiz Drude de Lacerda,Bruno Turcq,Bruno Turcq,A. Sifeddine,A. Sifeddine,A. Sifeddine,Renato Campello Cordeiro,Renato Campello Cordeiro +7 more
TL;DR: In this article, sediment cores from two locations across Caco Lake (Brazil) identified paleoclimate factors that had affected the Hg deposition in this shallow tropical lake and its relationship with past climate and basin processes.
References
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Book
Principal Component Analysis
TL;DR: In this article, the authors present a graphical representation of data using Principal Component Analysis (PCA) for time series and other non-independent data, as well as a generalization and adaptation of principal component analysis.
Reference EntryDOI
Principal Component Analysis
TL;DR: Principal component analysis (PCA) as discussed by the authors replaces the p original variables by a smaller number, q, of derived variables, the principal components, which are linear combinations of the original variables.
Journal ArticleDOI
Preservation of elemental and isotopic source identification of sedimentary organic matter
TL;DR: The amount and type of organic matter in the sediments of lakes and oceans contribute to their paleoenvironmental and paleoclimatological records as discussed by the authors, but only a small fraction of the initial aquatic organic matter survives destruction and alteration during sinking and sedimentation.
Book ChapterDOI
Sediment Organic Matter
Philip A. Meyers,Jane L. Teranes +1 more
TL;DR: The organic matter content of lake sediments provides a variety of indicators, or proxies, that can be used to reconstruct paleoenvironments of lakes and their watersheds and to infer histories of regional climate changes as mentioned in this paper.
Journal ArticleDOI
Stable isotope (δ13C and δ15N) signatures of sedimented organic matter as indicators of historic lake trophic state
TL;DR: This paper explored the use of carbon and nitrogen isotopes (δ13C and δ15N) in sedimented organic matter (OM) as proxy indicators of trophic state change in Florida lakes.