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Guimarães, J.T.F.; Sahoo, P.K.; E Souza-Filho, P.W.M.; Da Silva, M.S.; Rodrigues, T.M.; Da Silva, E.F.; Reis, L.S.; De Figueiredo, M.M.J.C.; Lopes, K.D.S.; Moraes, A.M.; et al. Landscape and Climate Changes in Southeastern Amazonia. Encyclopedia. Available online: https://encyclopedia.pub/entry/42825 (accessed on 20 June 2024).
Guimarães JTF, Sahoo PK, E Souza-Filho PWM, Da Silva MS, Rodrigues TM, Da Silva EF, et al. Landscape and Climate Changes in Southeastern Amazonia. Encyclopedia. Available at: https://encyclopedia.pub/entry/42825. Accessed June 20, 2024.
Guimarães, José Tasso Felix, Prafulla Kumar Sahoo, Pedro Walfir Martins E Souza-Filho, Marcio Sousa Da Silva, Tarcísio Magevski Rodrigues, Edilson Freitas Da Silva, Luiza Santos Reis, Mariana Maha Jana Costa De Figueiredo, Karen Da Silva Lopes, Aline Mamede Moraes, et al. "Landscape and Climate Changes in Southeastern Amazonia" Encyclopedia, https://encyclopedia.pub/entry/42825 (accessed June 20, 2024).
Guimarães, J.T.F., Sahoo, P.K., E Souza-Filho, P.W.M., Da Silva, M.S., Rodrigues, T.M., Da Silva, E.F., Reis, L.S., De Figueiredo, M.M.J.C., Lopes, K.D.S., Moraes, A.M., Leite, A.S., Da Silva Júnior, R.O., Salomão, G.N., & Dall’agnol, R. (2023, April 05). Landscape and Climate Changes in Southeastern Amazonia. In Encyclopedia. https://encyclopedia.pub/entry/42825
Guimarães, José Tasso Felix, et al. "Landscape and Climate Changes in Southeastern Amazonia." Encyclopedia. Web. 05 April, 2023.
Landscape and Climate Changes in Southeastern Amazonia
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The upland lakes (ULs) in Carajás, southeastern Amazonia, have been extensively studied with respect to their high-resolution structural geology, geomorphology, stratigraphy, multielement and isotope geochemistry, palynology and limnology.

upland lakes Carajás mountain range landscape evolution

1. Introduction

The upland lakes (ULs) in the Brazilian Amazon are singular mid-altitude (from 400 m to 800 m) landforms formed over iron and iron-aluminous lateritic crusts as a result of cyclic tectonic, weathering and the erosional processes under tropical climate conditions [1][2][3]. These lakes are classified as active and inactive lake systems, the latter corresponding to upland swamps [4].
The sediment deposition in ULs is highly influenced by the natural and local characteristics of the catchment basin, including the geology, vegetation cover, primary productivity of the central basin [5][6][7] and relative lake age [3]. Despite the relative homogeneity, the drainage basins in southeastern Amazonia locally present various lithotypes and geomorphological settings. Consequently, they hold plant communities with different structures and compositions [8]. Moreover, diagenetic processes have modified sediment composition [5]. All of these factors have controlled the geochemical and limnological characteristics of these ULs over time [9][10].
The Quaternary deposits in Amazonian ULs have different thicknesses. Some display continuous sedimentation, as evidenced in the Seis Lagos (northwestern Amazonia), Maicuru/Maraconaí (central-northeastern Amazonia) and Carajás (southeastern Amazonia) mountain ranges [4][11][12][13][14][15][16][17][18]. The investigations conducted at these localities have allowed an evaluation of the effects of the last glacial and interglacial periods on tropical Amazonia. ULs may become more similar to terrestrial habitats during the negative water balance period produced by prolonged water stress, which may affect the ecological attributes of water-dependent biota [19][20]. In contrast, more resilient ULs may act as microrefuges for such organisms. Thus, both the physical and biological aspects, as well as their dynamic nature, must be carefully evaluated over shorter (annual to decadal) and longer (century to millennial) time scales.

Geology, Physiography and Climate

The study area is located in the eastern portion of Carajás Province, southeastern Amazonia (Figure 1), and the geology is represented by: (1) Mesoarchean tonalite–trondhjemite–granodiorite (TTG) series and granulitic units (Xikrin-Cateté Orthogranulite) [21][22]; (2) Neoarchean metavolcano-sedimentary sequences [23]; (3) Neoarchean intrusive rocks [24] and mafic–ultramafic stratified bodies [25]; (4) Paleoproterozoic sedimentary rocks [26]; and (5) Paleoproterozoic anorogenic intrusions [27].
Figure 1. Upper map with study area in the context of South America and Amazon Rainforest (green area: forest cover, red areas: deforestation). Lower map with associated legends: geological map showing the main lithological units of the Carajás mountain range in the Brazilian Amazon. The studied lakes are located in the lateritic crusts in the Sul (active lakes: Três Irmãs, Amendoim, Violão; filled lakes: R1, R2, R4, R5), Norte (filled lake: Trilha da mata), Leste (active lake: lagoa Serra Leste—LSL), Tarzan (active lake: Tarzan) and Bocaína (filled lakes: LB3, LB4) plateaus.
The Cenozoic tropical paleoclimate has favored extensive weathering events in the region, contributing to the development of the lateritic crusts, which were mainly derived from metavolcano-sedimentary rocks, including the banded iron formation (BIF) of the Itacaiúnas Supergroup [1]. The ULs were formed according to neotectonic and weathering events that affected the lateritic crusts [1]. These lakes occur only at altitudes of between 600 and 800 m in the upper lateritic terrains (plateaus) of the Carajás mountain range, which includes Sul, Norte, Leste, Tarzan and Bocaína (Figure 1).

2. Lake Formation Processes

The lateritic crusts of the Sul mountain range are displaced by sets of E–W faults that are responsible for the morphology of the plateaus, NW–SE normal faults to NE–SW fractures, and sinistral—normal faults [3]. The partial dissolution of the lateritic crust oriented by these fractures and faults formed karst-like features, such as caves, sinkholes and underground streams [1]. A series of fault reactivations promoted the collapse of blocks along the normal faults, which formed the shallow upland lakes.
The shallow-water seismic transects and their reflection characteristics, as well as the sediment cores, allowed researchers to identify the geometry of the seismostratigraphic units deposited in the Carajás ULs [3] (Figure 2). The acoustic features are associated with the morphometry and morphology of the bedrock reflector, debris flows, synsedimentary deformational structures, plane-parallel reflectors and multiple reflectors from the water-substrate interface (Figure 2). The interface between the bottom sediments and the lateritic crust is marked by a total acoustic reflection of the crust, which produces strong-amplitude lake-bottom multiples (bedrock reflectors). The basal fine-grained deposits located near the main drainage inflows correspond to the fault-collapsed, basinward prograding clinoforms related to the delta fans. Underflow processes are responsible for carrying fine-grained particles toward the lake depocenter, interrupted by siderite beds. The top deposits are related to massive aggradational and structureless mud with some scattered peat fragments (Figure 2). This facies an arrangement that produces fining and thinning upward cycles, which might vary in thickness depending on the rate of the accommodation space.
Figure 2. NW–SE longitudinal seismic transects showing the different observed morphologic levels, depositional units, basement and multiple reflectors, and fault. The seismostratigraphic interpretation in the lower part of the figure. Upper figure (shallow seismic image), middle figure (seismostratigraphic interpretation) and lower figure (legends and location of the seismic profile in the lake bathymetry).

3. Surface Geology and Geobotany of the Catchment Basins

The lateritic crusts of the study area are genetically classified as structured (iron ore), detrital and Al-rich crusts [28] (Figure 3). Structured and detrital crusts were formed by the lateritization of BIF and the weathering of the structured crusts, respectively, and contain hematite, magnetite, goethite and secondarily quartz and clay minerals [9]. These crusts are generally thick and more resistant to modern weathering, forming only Petric Plinthosols/Petroferric Acrustox, which dominate the higher topographic levels. Conversely, the Al-rich crusts formed by the lateritization of mafic rocks are richer in clay minerals and gibbsite, especially close to the saprolite horizon. Additionally, they are less resistant to weathering and occur on lower quotas than structured and detrital crusts. Thus, these crusts may produce thicker soils (i.e., Ferrasols/Oxisols).
Figure 3. (a,b) Digital elevation model (DEM) integrated with bathymetric data showing the western and eastern portions of the Serra Sul Plateau and the main lithotypes described in the catchment basins of active ULs. Aerial photograph of (c) Três Irmãs (TI1, TI2 and TI3), (d) Amendoim (AM) and Violão lakes (VL). (e,f) DEM showing the main lithotypes described in the catchment basins of filled ULs, also a detail (black arrow) for the direction of view of photo (e,f). (g,h) Aerial photograph of the filled ULs.
The detrital and structured crusts have some peculiar characteristics, including shallow, patchy and acidic soils, with low water retention and nutrient availability and high insolation and temperature [30][31], which allowed the widespread development of canga vegetation and hindered the colonization of tree species (Figure 3a–d), such as SDF and HETF [8][30]. This interpretation is supported by the high δ13C values of the canga vegetation compared to soils in neotropical forests, which are related to more pronounced water shortages in cangas than forests [32]. Mafic sills and dikes are predominant on the slopes of the Carajás mountain range and marginal to the Três Irmãs and Violão lakes, extending toward Amendoim Lake (Figure 3a–d). Palms and macrophytes occur extensively in filled lakes (Figure 3e–h). Moreover, macrophytes, especially Isoëtes cangae, which is a very rare and endemic species, are widely found at the bottom of Amendoim Lake at depths up to 7 m [33]. The dominant plant species of each physiognomy are described in Table 1.
Table 1. Main plant species of canga vegetation, SDF (semideciduous tropical dry forests) HETF (humid evergreen tropical forest) and filled lakes according to their based on [9][34], reviewed according to Carajás Flora Project [35].

References

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  2. Costa, M.L.; Carmo, M.S.; Behling, H. Mineralogia e geoquímica de sedimentos lacustres com substrato laterítico na Amazônia Brasileira. Rev. Bras. Geociências 2005, 35, 165–176.
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  10. Sahoo, P.K.; Guimarães, J.T.; Souza-filho, P.W.; Bozelli, R.L.; de Araujo, L.R.; de Souza Menezes, R.; Lopes, P.M.; da Silva, M.S.; Rodrigues, T.M.; da Costa, M.F.; et al. Limnological characteristics planktonic diversity of five tropical upland lakes from Brazilian Amazon. Ann. Limnol. Int. J. Limnol. 2017, 53, 467–483.
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  15. D’Apolito, C.; Absy, M.L.; Latrubesse, E.M. The Hill of Six Lakes revisited: New data and re-evaluation of a key Pleistocene Amazon site. Quat. Sci. Rev. 2013, 76, 140–155.
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  18. Reis, L.S.; Bouloubassi, I.; Mendez-Millan, M.; Guimarães, J.T.F.; Romeiro, L.D.A.; Sahoo, P.K.; Pessenda, L.C.R. Hydroclimate and vegetation changes in southeastern Amazonia over the past ∼25,000 years. Quat. Sci. Rev. 2022, 284, 107466.
  19. Lopes, P.M.; Caliman, A.; Carneiro, L.S.; Bini, L.M.; Esteves, F.A.; Farjalla, V.; Bozelli, R.L. Concordance among assemblages of upland Amazonian lakes and the structuring role of spatial and environmental factors. Ecol. Indic. 2011, 11, 1171–1176.
  20. Mormul, R.P.; Esteves, F.D.A.; Farjalla, V.F.; Bozelli, R.L. Space and seasonality effects on the aquatic macrophyte community of temporary Neotropical upland lakes. Aquat. Bot. 2015, 126, 54–59.
  21. Feio, G.; Dall’Agnol, R.; Dantas, E.; Macambira, M.; Santos, J.; Althoff, F.; Soares, J. Archean granitoid magmatism in the Canaã dos Carajás area: Implications for crustal evolution of the Carajás province, Amazonian craton, Brazil. Precambrian Res. 2013, 227, 157–185.
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