Geochemistry of upland lacustrine sediments from Serra dos Carajás, Southeastern Amazon, Brazil: Implications for catchment weathering, provenance, and sedimentary processes

Sahoo, Prafulla Kumar; Guimarães, José Tasso Felix; Souza-Filho, Pedro Walfir M.; Silva, Marcio Sousa da; Maurity, Clóvis; Powell, M. A.; Rodrigues, Tarcísio Magevski; Silva, Delmo Fonseca da; Mardegan, Sílvia Fernanda; Neto, Antônio Eduardo Furtini; Dall’Agnol, Roberto

doi:10.1016/j.jsames.2016.09.003

Cited by 35 publications

(27 citation statements)

References 54 publications

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“…The multi-proxy geochemical analyses of surface sediments of these lakes, soils and lithotypes of their catchments, supplemented by statistical methods, evaluated the major factors such as catchment lithology, source area weathering, transport, and depositional processes that influencing the modern sedimentation in the lakes (Sahoo et al, 2015(Sahoo et al, , 2016a(Sahoo et al, , 2017a(Sahoo et al, , 2019. The results show that detritic sediments are mainly enrichment of Fe2O3 and P2O5 and Se when compared to upper continental crust (UCC).…”

Section: Modern Sedimentation Patterns: Basin Morphology and Source-tmentioning

confidence: 99%

“…Binary plot of (a) δ 13 C vs. C/N and (b) δ 15 N vs. δ 13 C of the surficial sediments of the active ULs, and (c) δ 13 C vs. C/N and (d) δ 15 N vs. δ 13 C of sediment cores from filled ULs of the Carajás region (fields based on Deines, 1980;Boutton, 1991;Hamilton and Lewis, 1992;Thornton and McManus, 1994;Meyers, 1997;Brenner et al, 1999;Troxler and Richards, 2009;Sahoo et al, 2015Sahoo et al, , 2016aSahoo et al, , 2017a, The δ 13 C and δ 15 N, and C/N data from surficial sediments of the Violão Lake indicate that the organic matter comes from the siliceous sponge spicules, algae, and C3 vascular forest plants (Sahoo et al, 2015). The latter is dominant in the shallower portion of this lake (arm), with more impoverished δ 15 N. Considering the Amendoim Lake, the stable isotopic compositions are quite homogeneous, and suggest organic sources composed of submerged macrophytes and palms (Sahoo et al, 2016a). More diversified sources occur in the Três Irmãs Lake.…”

Section: The Role Of Isotopes In Understanding the Sources Of Sedimenmentioning

confidence: 99%

“…The ULs sediments are highly influenced by natural and local characteristics of each catchment basins, including parent rock properties, source-area weathering, rheology, morphology and vegetation cover, as well as the primary productivity of the central basins (Sahoo et al, 2015(Sahoo et al, , 2016a(Sahoo et al, , 2017a. The interrelation of these factors have controlled the geochemical and limnological characteristics of these lakes through time (Sahoo et al, 2017b).…”

Section: Introductionmentioning

confidence: 99%

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Upland Lakes of the Carajás Region: Origin and Development through Time

Guimarães¹,

Sahoo²,

Souza-Filho³

et al. 2019

Preprint

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Upland lakes (ULs) of the Carajás, southeastern Amazonia, have been intensively studied to their evolution during the Quaternary, as well as the development of the associated biota. In this review, several classical and modern approaches from structural geology to the pollen rain and sedimentary data which cover an area of around 41,300 km2 were compiled. Multi-elemental geochemistry indicates that the detrital sediments derived from weathered crusts and soils, while the sedimentary organic matter represent autochthonous (siliceous sponge spicules, algae, macrophytes) and allochthonous (C3 plants and freshwater DOC) sources. Modern pollen rain suggests that even small lakes and canga areas can reflect forest signal, which depends on the topographic control and prevailing wind direction on pollen deposition. Integrated data of the sedimentary cores indicate that the active lakes never dried up during the last 50 ka cal BP. However, subaerial exposure occurs on filled lakes such as ST02 Lake during the LGM, LB3 and R2 lakes at the mid-Holocene due to drier paleoclimate conditions. Considering the organic proxies, only LB3 Lake presents expansion of C4 canga (montane savanna) plants since ULs of the Serra da Bocaína does not present siderites. Siderite formation on ULs deposits also points to drier paleoenviromental conditions, interrupting predominantly wet conditions. However, there is no evidence for widespread expansion of savanna into Southeastern Amazonia during the late Pleistocene and Holocene.

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Section: Modern Sedimentation Patterns: Basin Morphology and Source-tmentioning

confidence: 99%

Section: The Role Of Isotopes In Understanding the Sources Of Sedimenmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Upland Lakes of the Carajás Region: Origin and Development through Time

Guimarães¹,

Sahoo²,

Souza-Filho³

et al. 2019

Preprint

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“…The pond dries seasonably, corroborating for the lower content of organic matter. Additionally, the lagoon has organic inputs from sources composed primarily of palms and macrophytes (Sahoo et al, 2016). The enormous Fe concentration is a reflex of the geochemistry of this enriched Fe 2 O 3 sediment.…”

Section: Discussionmentioning

confidence: 99%

Ex-situ cultivation of Isoetes cangae and Isoetes serracarajensis (Isoetaceae) two endemic species from Brazilian Amazon

et al. 2019

Preprint

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Isoetes L. is a genus of lycophytes widely distributed around the world that has a large number of endemic species. Here we document the first successful large scale ex-situ cultivation of the new endemic species from Brazilian Amazon quillworts Isoetes cangae and Isoetes serracarajensis.These isoetids are endemic of an iron mining site and grow on a superficial broad applicability, assisting other low-cost cultivation studies, which are very important in ecosystem recovery of mining areas and conservation strategies.

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“…Analytical precision is ± 0.1% and ±0.2‰, respectively. The interpretations about sources of organic matter were based on previous works and references therein (Deines 1980, Salomons and Mook 1981, Meyers 1994, Thornton and McManus 1994, Tyson 1995, Meyers 1994, 1997, 2003, Lamb et al 2006, Sahoo et al 2015, 2016b.…”

mentioning

confidence: 99%

Holocene history of a lake filling and vegetation dynamics of the Serra Sul dos Carajás, southeast Amazonia

Guimarães

Sahoo

Souza‐Filho

et al. 2019

An. Acad. Bras. Ciênc.

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Down-core changes in sedimentary facies, elemental geochemistry, pollen, spore, δ 13 C, δ 15 N and radiocarbon records from a filled lake, named R4, of the Serra Sul dos Carajás were used to study the relationship between the paleomorphological and paleoecological processes and their significance for Holocene paleoclimatology of the southeast Amazonia. The sediment deposition of the R4 lake started around 9500 cal yr BP. Increase of detrital components from 9500 to 7000 cal yr BP suggests high weathering of surrounding catchment rocks and soils, and deposition into the lake basin under mudflows. At that time, montane savanna and forest formation were already established suggesting predominance of wet climate. However, from 7000 to 3000 cal yr BP, a decline of detrital input occurred. Also, forest formation and pteridophytes were declined, while palms and macrophytes were remained relatively stable, indicating that water levels of the lake is likely dropped allowing the development of plants adapted to subaerial condition under drier climate conditions. After 3000 cal yr BP, eutrophication and low accommodation space lead to high lake productivity and the final stage of the lake filling respectively, and forest formation may has acquired its current structure, which suggests return of wetter climate conditions.

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Geochemistry of upland lacustrine sediments from Serra dos Carajás, Southeastern Amazon, Brazil: Implications for catchment weathering, provenance, and sedimentary processes

Cited by 35 publications

References 54 publications

Upland Lakes of the Carajás Region: Origin and Development through Time

Upland Lakes of the Carajás Region: Origin and Development through Time

Ex-situ cultivation of Isoetes cangae and Isoetes serracarajensis (Isoetaceae) two endemic species from Brazilian Amazon

Holocene history of a lake filling and vegetation dynamics of the Serra Sul dos Carajás, southeast Amazonia

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