Genesis and paleoclimatic significance of palygorskite in the cretaceous paleosols of the Bauru Basin, Brazil

Silva, Márcio Luiz da; Batezelli, Alessandro; Ladeira, Francisco Sérgio Bernardes

doi:10.1016/j.catena.2017.12.031

Cited by 18 publications

(13 citation statements)

References 39 publications

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“…Whilst previous studies of Bauru DFS palaeosols have been undertaken (e.g. Suguio et al ., ; Fernandes, ; Ladeira et al ., ; Dal'Bo et al., ; Fernandes, ; Pereira et al ., ; Silva et al ., ; Silva et al ., ; Nascimento et al ., Silva et al ., ,b,c), little is known about their lateral and vertical distributions or their stratigraphic meaning. Associated with the facies and architectural elements, palaeosol profiles with different degrees of evolution occur.…”

Section: Resultsmentioning

confidence: 99%

“…The formation of palygorskite and carbonatic horizons has been associated with arid to semi‐arid conditions (Goudie, ; Wright & Tucker, ; Abtahi & Khormali, ; Khormali et al ., ; Daoudi, ; Silva et al ., ,b,c), usually with rainfall amounts between 500 mm and 1000 mm (Wright & Tucker, ). The fact that palygorskite stands out in well‐developed Bt and Bk horizons is related to both its position in the landscape and good drainage.…”

Section: Resultsmentioning

confidence: 99%

“…The carbonate palaeosol profiles described in this part of the study area containing high concentrations of CaCO 3 consist of Ck, Bt, Bk and Btk horizons, and are classified as pisolitic, laminar, and chalky (Alonso‐Zarza, ; Alonso‐Zarza & Wright, ; Pereira et al ., ; Silva et al ., ; Silva et al ., ; Nascimento et al ., ; Silva et al ., ,b,c), indicating varying degrees of development. The thick, well‐developed palaeosol profiles with Bt and Bk horizons were probably formed over hundreds or thousands of years (Birkeland, ), indicating stable surfaces and low sedimentation rates (Alonso‐Zarza & Silva, ).…”

Section: Resultsmentioning

confidence: 99%

“…The palaeosol profiles described in this part of the study area containing carbonate concentrations can be classified as transitional, chalky or nodular horizons ( sensu Alonso‐Zarza & Wright, ; Pereira et al ., ; Silva et al ., ; Silva et al ., ; Nascimento et al ., ; Silva et al ., ,b,c), presenting abundant powdery calcium and carbonatic nodules. In the palaeosols described in this part of the study area, carbonate precipitation occurred in association with roots (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…In recent decades, the study of the palaeosols has been emphasized in sedimentological analysis and palaeoenvironmental evolution (e.g. Suguio et al., ; Fernandes, ; Ladeira et al., ; Dal'Bo et al ., ; Fernandes, ; Pereira et al., ; Silva et al., ; Silva et al ., ; Basilici et al ., ; Nascimento et al ., ; Silva et al ., ,b,c).…”

Section: Introductionmentioning

confidence: 97%

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Facies and palaeosol analysis in a progradational distributive fluvial system from the Campanian–Maastrichtian Bauru Group, Brazil

et al. 2018

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The Upper Cretaceous Bauru Group in south‐east Brazil consists of alluvial strata whose characteristics and distribution indicate a fluvial system developed in a semi‐arid to arid climate. Sections exposed within a 90 000 km2 study area in Minas Gerais State (in south‐eastern Brazil) were evaluated using facies and palaeosol analysis to formulate depositional and pedogenic models that may account for geomorphic and climate features. From east to west, the study succession records a gradual decrease in grain size, an increase in the width/thickness ratio in channels, a decrease in the lateral and vertical connectivity of channel deposits, and an increase in overbank deposits. The fluvial architecture indicates a braided channel belt, ephemeral ribbon–channels, and an unconfined fluvial facies from east to west in the study area. The lateral and vertical distribution of facies, stratigraphic architecture and palaeocurrent data suggest proximal, medial and distal portions of a progradational distributive fluvial system. The sedimentary dynamics were marked by the building and abandonment of channels related to processes of aggradation, vegetation growth and palaeosol generation. Macromorphological and micromorphological analyses have identified pedological and mineralogical features that indicate an arid to semi‐arid climate with a provenance from the north‐eastern part of the basin (Alto Paranaiba Uplift). From the proximal to the distal portions of the distributive fluvial system, the palaeosol development is different. In the proximal portion, the palaeosols are absent or poorly developed, allowing a possible general comparison with the present soil order: Inceptisols and Aridisols. In the medial portion of the fluvial system, the palaeosols are well‐developed and characterized by Bt, Btk, C and Ck horizons (Alfisols, Aridisols, Inceptisols and Entisols). Poorly drained to well‐drained palaeosols from the base to the top in the distal plain (Aridisols and Inceptisols) are associated with geomorphic and hydromorphic changes in the fluvial system due to progradational evolution. The genetic relationship between the fluvial architecture and the palaeosols enhances the understanding that the sedimentation and pedogenesis that occurs in different portions of the distributive fluvial system are related to the tectonic and climatic evolution of the basin.

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