Multivariate statistics and geochemical approaches for understanding source-sink relationship - a case study from close-basin lakes in Southeast Amazon

Moraes, Aline Mamede; Sahoo, Prafulla Kumar; Guimarães, José Tasso Felix; Leite, Alessandro Sabá; Salomão, Gabriel Negreiros; Souza-Filho, Pedro Walfir M.; Júniora, Wilson Nascimento; Dall’Agnol, Roberto

doi:10.1016/j.jsames.2020.102497

Cited by 8 publications

(2 citation statements)

References 48 publications

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“…Variation in land use types within the lake-catchment system is of great importance to understanding lake environmental changes [6,7]. Lakes are a sink that receive the erosional materials from river catchments via the processes of soil erosion, delivery, and accumulation [8][9][10]. Lacustrine sediments, in which stable, continuous, and high-resolution records are contained, can be regarded as excellent archives for identifying the erosional sources under diversified land use patterns over time [7,11].…”

Section: Introductionmentioning

confidence: 99%

Evaluating the Evolution of Soil Erosion under Catchment Farmland Abandonment Using Lakeshore Sediment

Wang

Zhao²,

Han³

et al. 2022

Sustainability

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Discriminating the potential sources contributing to lacustrine sediment is helpful for decision-making for catchment soils and lake management strategies within lake-catchment systems. Using a sediment fingerprinting approach from the multivariate mixing model, the spatiotemporal sources of geology and land use were identified in a small agricultural catchment in southwest China. Results showed that sediment accumulation rates (SARs) were estimated to range from 0.002 to 0.065 g cm−2 a−1 (mean 0.015 ± 0.016 g cm−2 a−1), which has a positive correlation with instrumental Indian Summer Monsoon (ISM) precipitation. Time-integrated sources were divided into four zones in combination with the changes in SARs, which were qualitatively and quantitively interpreted by particle size, and precipitation, and historical land use polies over the past ~160 years. Spatially, Quaternary granite (QG) in geology and channel bank (CB) in land use were the dominant contributors to the lakeshore sediment, respectively. Two relatively higher contributions of abandoned land (AL) to lakeshore sediment were found during the periods of 1930s–1950s and post-1990s, which originated from the dual impacts of topographical factors of slope gradient and elevation, and socioeconomic factors of the gap of farmer’s expenditure to income. The results illustrate that restricting the farmland to be abandoned would be useful for reducing the soil erosion within the lake-catchment system.

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Section: Introductionmentioning

confidence: 99%

Evaluating the Evolution of Soil Erosion under Catchment Farmland Abandonment Using Lakeshore Sediment

Wang

Zhao²,

Han³

et al. 2022

Sustainability

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“…During the last 10 years, multidisciplinary research has been carried out in upland lakes located along the borders of the Archean volcanic and iron‐rich rocks of the Carajás Mineral Province. These studies attempt to understand the late Quaternary environmental history and climate changes that took place in this part of the Amazonia region (Guimarães et al ., 2016, 2017; Reis et al ., 2017) and the close relations between lake basin morphology and sedimentary and geochemical processes (Sahoo et al ., 2015; Souza‐Filho et al ., 2016; Moraes et al ., 2020).…”

Section: Introductionmentioning

confidence: 99%

The role of fault reactivation in the development of tropical montane lakes

Souza‐Filho

Pinheiro

Costa

et al. 2020

Earth Surf Processes Landf

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This work details the role of fault reactivation in the development of tropical montane lakes by using basin morpho-structural analysis and seismostratigraphic studies. The upland lakes are severely faulted sinkholes, whose faults penetrate the Quaternary sedimentary units. Four main stages are related to the lake formation: (i) an Early Proterozoic tectonic deformation of the rocks along the southern border of the Carajás Structure, where the lake is placed; (ii) differential erosion byand building ofthe formation of the South Carajás Hill; (iii) Fe-rich crust formation by weathering and gravitational collapse faults following the E-W plateau border and the start of Violão Lake formation during the Pliocene-Pleistocene; and (iv) episodic fault-fracture reactivation by gravitational collapse causing pulses of subsidence in the lake and outlining its faulted borders. Dissolution of the lateritic crust and erosion by runoff drainage under wet climate conditions were coeval with fault activities, which allowed the deposition of relatively thick clastic deposits organized in three main seismostratigraphic units associated with major lake-level fluctuations. Initial fault reactivation under low-level water started lacustrine basin development with deposition of prograding fan deltas related to the main drainage. A second fault reactivation by gravitational collapse increased the lake accommodation space and resulted in the deposition of fine-grained sediments from dilute interflows or overflows until 36000calyear BP. At about 31000calyear BP, rapid decreases in the lake water level under redox conditions at the sediment/water interface allowed widespread siderite formation. A third gravitational collapse episode was responsible for the increase in the lake area and depth and the returning of clastic/organic deposition up to the present. This tropical montane lake can be seen as a representative example for understanding the formation of other upland lakes controlled by fault reactivation.

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Provenance identification of soil at the confluence of Thar desert, Aravalli hills, and alluvial plain based on trace and rare earth elements geochemistry

2021

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Multivariate statistics and geochemical approaches for understanding source-sink relationship - a case study from close-basin lakes in Southeast Amazon

Cited by 8 publications

References 48 publications

Evaluating the Evolution of Soil Erosion under Catchment Farmland Abandonment Using Lakeshore Sediment

Evaluating the Evolution of Soil Erosion under Catchment Farmland Abandonment Using Lakeshore Sediment

The role of fault reactivation in the development of tropical montane lakes

Provenance identification of soil at the confluence of Thar desert, Aravalli hills, and alluvial plain based on trace and rare earth elements geochemistry

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