Geomorphic expression of shear zones in Southern Brazilian and Uruguayan Shields

Cardoso, Marcio Adriano; Silveira, Ariane Santos da; Vargas, Mateus Rodrigues de; Oliveira, José Manuel Marques Teixeira de; Barbosa, Dante Vinicius Eloy; Oliveira, Luiz Felipe Bertoldi de; Fredere, Aline Cambri; Lôndero, Vinicius

doi:10.1016/j.geomorph.2021.107678

Cited by 6 publications

(5 citation statements)

References 39 publications

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“…Transfer Phenomena in Fluid and Heat Flows XIV The evolutionary aspect of the fluvial system reproducing the retraction of knickzones is also identified, that are the anomalous slopes occasioned by erosion signals towards watersheds. In the study area, this knickzone is attributed to the Erval shear zone of NE-SW direction, generated by tectonic movement, and expressed by waterfalls in the greatest differences in the slope of the watershed [34]. Figure 5B, in the T1 increment, the highest erosion values can be observed positioned over the current knickzone.…”

Section: Resultsmentioning

confidence: 79%

Implementation, Validation and Study Case of a Landscape Evolution Model Algorithm

Barbosa,

Cardoso Jr.,

Oliveira

et al. 2023

DDF

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This paper presents a landscape evolution model based on physical processes – hillslope processes and fluvial erosion, transport, and deposition – solved by numerical methodology. That is, through the solution of differential equations approximated by numerical methods. In this case, hillslope processes are modeled through the classical diffusion equation, discretized by the finite volume method. Fluvial erosion, transport, and deposition are modeled by the fluvial potential equations (stream power law). For this, the approximation is performed by the finite difference method. The topography – initial condition – is set by digital elevation models, obtained from satellite images. These are Raster datasets, that each cell contains a representative elevation value. The drainage is determined through the classical algorithm D8, which performs a scan on the digital elevation model, tracing routes of greater slopes between the cells. The algorithm execution flowchart is presented, and the model is validated. Finally, a geomorphological study is presented in the Piratini river basin, showing thar developed model mimics largescale natural phenomena of watershed processes.

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Section: Resultsmentioning

confidence: 79%

Implementation, Validation and Study Case of a Landscape Evolution Model Algorithm

Barbosa,

Cardoso Jr.,

Oliveira

et al. 2023

DDF

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“…Therefore, similar to the northern region, the Neogene paleoenvironment at this location is interpreted as a structurally controlled incised valley, formed during the Miocene marine regression. Considering the clinothem pathway and the distribution of fluvial systems in the region (Cardoso Jr. et al., 2021), it is possible that this paleo‐incised valley was formed via the progradation of the Neogene paleo‐Jacuí over the shelf‐edge.…”

Section: Discussionmentioning

confidence: 99%

Neogene evolution of the margin adjacent to the La Plata River Delta (Pelotas Basin): Sedimentary pathways and the origins of the Rio Grande Cone

Tagliaro,

Britzke,

Gama

et al. 2024

Basin Research

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Continental margins that exhibit high terrigenous input are generally located near deltas that are capable of transporting large quantities of sediments into the basin. However, in rare cases, high terrigenous sedimentation occurs in regions deprived of major riverine systems where the sedimentary pathway is enigmatic. One such case is the Neogene of the Pelotas Basin of Brazil and Uruguay, adjacent to the La Plata River mouth. Since the Miocene, anomalous sedimentation formed a giant progradational wedge, the Rio Grande Cone, one of the largest submarine fan‐like features on Earth. To understand the Neogene evolution of the margin and the origins of the Rio Grande Cone, here we present a seismic‐stratigraphic framework based on well‐logs and 2D seismic data. Three depositional environments are identified: (1) on the shelf, upper Miocene to Pliocene fluvial channels delivered sand deposits on the mud‐dominated shelf; (2) on the slope, sediment instability resulted in structural deformation and multiple phases of mass transport deposition and (3) on the lower slope and basin floor, large contourite drifts formed by sediment reworking. We classify the Rio Grande Cone as a megaslide complex, due to its depositional and structural setting. Local deltaic systems were active on the shelf in the Neogene, but the limited size of their paleo‐drainage systems in comparison to the volume of sedimentation in the margin suggests that an additional sedimentary pathway existed. In this sense, the demise of an epicontinental sea over the La Plata Basin during the Neogene likely enabled the input of large volumes of fine sediments into the margin, via the La Plata plume water. We suggest that the desiccation of this epicontinental sea and the intensification of ocean currents since the middle Miocene explains the anomalous Neogene terrigenous influx into the SW Atlantic margin.

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“…The application of morpho-tectonic indices along continental-scale features has been discussed in many studies [6,57,63,69,70]. Various analyses have been applied to the relationship between two morphometric indices (Smf and Vf) to present a primary quantitative model of the levels of tectonic activity of mountain fronts.…”

Section: Relative Tectonic Activity Levels Discussionmentioning

confidence: 99%

“…The hypsometric integral index reflects the distribution of different elevations in a landscape [57,58]. This index is calculated for a particular catchment area [7].…”

Section: Hypsometric Integral Index (Hi)mentioning

confidence: 99%

GIS-Analysis for Active Tectonics Assessment of Wadi Al-Arish, Egypt

et al. 2023

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In this paper, we apply an effective method to evaluate relative tectonic activity by applying several morph-tectonic indices that are useful in evaluating topography and tectonics. These indices include stream length-gradient, asymmetric factor, hypsometric index, hypsometric curves, valley floor width to valley height ratio, drainage basin shape, and mountain front sinuosity. The study region of Wadi Al-Arish in northern Sinai Peninsula in northern Egypt is a natural laboratory to examine relative tectonic activity levels for calculating morpho-tectonic indices of several catchments and sub-catchments rather than an individual catchment. Northern Sinai, comprising the Waid Al-Arish area, is characterized by several large inversion anticline folds. The cumulative results extracted from morpho-tectonic indices ae presented as a new index, namely relative tectonic activity level (RTAL), which we classified into four levels: low, moderate, high, and very high relative tectonic activity. Therefore, the study region provides different levels of relative tectonic activity resulting from fault patterns affecting the northern Sinai inversion forms. The paper examines the concept that regions with various levels of tectonic activity are associated with specific values of RTAL.

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Geomorphic expression of shear zones in Southern Brazilian and Uruguayan Shields

Cited by 6 publications

References 39 publications

Implementation, Validation and Study Case of a Landscape Evolution Model Algorithm

Implementation, Validation and Study Case of a Landscape Evolution Model Algorithm

Neogene evolution of the margin adjacent to the La Plata River Delta (Pelotas Basin): Sedimentary pathways and the origins of the Rio Grande Cone

GIS-Analysis for Active Tectonics Assessment of Wadi Al-Arish, Egypt

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