Geochemical characterization of the largest upland lake of the Brazilian Amazonia: Impact of provenance and processes

Sahoo, Prafulla Kumar; Guimarães, José Tasso Felix; Souza-Filho, Pedro Walfir M.; Silva, Marcio Sousa da; Júnior, Wilson Nascimento; Powell, M. A.; Reis, Luiza Santos; Pessenda, Luiz Carlos Ruiz; Rodrigues, Tarcísio Magevski; Silva, Delmo Fonseca da; Costa, Vladimir Eliodoro

doi:10.1016/j.jsames.2017.10.016

Cited by 24 publications

(32 citation statements)

References 68 publications

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“…This dataset was used for interpretation of the morphological features and real-time navigation during field surveys, which were supported by a Differential Global Positioning System. The main lithotypes and soil samples were described and collected according to Maurity and Kotschoubey (1995) and Sahoo et al (2017a).…”

Section: Methodsmentioning

confidence: 99%

“…Total sulphur (TS) and total organic carbon (TOC) were measured using a LECO CS-300 combustion analyzer. See Sahoo et al (2017a) for more details about sample preparation and data treatment.…”

Section: Methodsmentioning

confidence: 99%

“…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%

“…The results show that detritic sediments are mainly enrichment of Fe2O3 and P2O5 and Se when compared to upper continental crust (UCC). High Chemical Index of Alteration (CIA), Mafic Index of Alteration (MIA) and Index of Laterization (IOL) values indicate intense chemical weathering at source areas, however, similar values between soils and catchment rocks indicates the weathering transformation between them and its erosion led to its deposition as sediment into the lakes (Sahoo et al, 2017a).…”

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

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: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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

confidence: 99%

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

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 geochemical and pedogenic signatures of Shantisagara lake sediments, southern India: Implications for weathering, terrigenous influx, and provenance during the Holocene

et al. 2022

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Lake sedimentary processes and vegetation changes over the last 45k cal abpin the uplands of south‐eastern Amazonia

Guimarães

Sahoo

Figueiredo

et al. 2021

J Quaternary Science

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This study addresses paleoclimate influences in a southern Amazonia ecotone based on multiproxy records from lakes of the Carajás region during the last 45k cal a BP. Wet and cool environmental conditions marked the initial deposition in shallow depressions with detrital sediments and high weathering rates until 40k cal a BP. Concomitantly, forest and C3 canga plants, along with cool-adapted taxa, developed; however, short drier episodes enabled expansion of C4 plants and diagenetic formation of siderite. A massive event of siderite formation occurred approximately 30k cal a BP under strong drier conditions. Afterwards, wet and cool environmental conditions returned and persisted until the Last Glacial Maximum (LGM). The LGM was marked by lake-level lowstands and subaerial exposure. The transition from the LGM to the Holocene is marked by the onset of oscillations in temperature and humidity, with an expansion of forest and canga plants. Cool taxa were present for the last time in the Carajás region~9.5-9k cal a BP. After 10k cal a BP, shallow lakes became upland swamps due to natural infilling processes, but the current vegetation types and structures of the plateaus were acquired only after 3k cal a BP under wetter climatic conditions.

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Geochemical characterization of the largest upland lake of the Brazilian Amazonia: Impact of provenance and processes

Cited by 24 publications

References 68 publications

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

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

The geochemical and pedogenic signatures of Shantisagara lake sediments, southern India: Implications for weathering, terrigenous influx, and provenance during the Holocene

Lake sedimentary processes and vegetation changes over the last 45k cal abpin the uplands of south‐eastern Amazonia

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