Interactions between tectonics, bedrock inheritance and geomorphic responses of rivers in a post-rifting upland (Ponta Grossa Arch region, Brazil)

Santos, Marcilene dos; Ladeira, Francisco Sérgio Bernardes; Batezelli, Alessandro; Nunes, João Osvaldo Rodrigues; Salamuni, Eduardo; Silva, Clauzionor Lima da; Molina, Eder Cassola; Moraes, Isabel Cristina

doi:10.1590/2317-4889202220210002

Cited by 3 publications

(1 citation statement)

References 62 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Landscapes in areas far from tectonic plate boundaries can be pushed out of equilibrium by a variety of external factors, some of which are wholesale uplift (i.e., Gallen et al, 2013), the long‐lived response to incision through variable lithologic strata (i.e., Beeson et al, 2017; Gallen, 2018) and reactivation of pre‐existing structures in intraplate settings far from active tectonic boundaries (i.e., Calegari et al, 2021; Marques et al, 2021). In the latter case, the detection of tectonically driven landscape disequilibrium is challenging due mainly to the lack of temporal control of fault reactivation (Salamuni et al, 2021; Sanches, 2018; Santos, Ladeira, & Barezelli, 2019; Santos, Salamuni, et al, 2019; Santos et al, 2022; Vedovello, 2017). Given that both variable rock types and intraplate reactivations might coevally affect landscape evolution, determining what factors caused landscape disequilibrium to begin with remains a challenge.…”

Section: Introductionmentioning

confidence: 99%

Cenozoic tectonic reactivation and its implications for landscape transience in southeastern Brazil

dos Santos,

Salamuni,

Val

et al. 2023

Earth Surf Processes Landf

Self Cite

View full text Add to dashboard Cite

Intraplate settings far from tectonic plate boundaries are normally thought to be tectonically inactive regions in which the landscape evolves via the slow downcutting of fluvial systems. When identified, tectonic reactivations are thought to be of too low an amplitude and not cause any change in the landscape. However, in the absence of datable markers of tectonic deformation, the landscape can be used as a passive marker of intraplate tectonic activity. In this study, we investigate the northern boundary of the Ponta Grossa Arch in the southeastern portion of the Brazilian passive margin. We mapped and studied the spatial and temporal (relative) relationships between brittle structures and geomorphic markers of base level changes. Drainage anomalies (knickpoints and high ksn values) are correlated with structural/tectonic lineaments in which we recognize strike‐slip and transtensional faults with right‐lateral and left‐lateral kinematics. Through mapping and analysis of structural data, we constrained the underlying structural framework. The fault data demonstrate the counterclockwise rotation of the maximum stress field, which moved from the NE–SW orientation (at the Cretaceous‐Paleogene boundary) to N‐S to reach the current WNW‐ESE position. Together, the data suggest that, though subtle and low‐magnitude, the evolution of intraplate stress field forms a dynamic forcing of intracontinental landscape change.

show abstract

Section: Introductionmentioning

confidence: 99%

Cenozoic tectonic reactivation and its implications for landscape transience in southeastern Brazil

dos Santos,

Salamuni,

Val

et al. 2023

Earth Surf Processes Landf

Self Cite

View full text Add to dashboard Cite

show abstract

Cenozoic Morphotectonic Evolution of the Eastern Edge of Paraná Basin, Southern Brazil

Sanches,

Salamuni,

da Silva

et al. 2023

Preprint

View full text Add to dashboard Cite

Lithosphere density structure of southeastern South America sedimentary basins from the analysis of residual gravity anomalies

Moura,

Marangoni

2023

Front. Earth Sci.

View full text Add to dashboard Cite

We conduct a gravity study of the lithosphere beneath three large sedimentary basins in southeastern South America: Paraná, Chaco-Paraná, and Pantanal. We compile a massive gravity database and estimate the free-air and Bouguer gravity anomalies, resulting in a novel complete Bouguer anomaly map for the study area. To discern the influence of crustal loads with known lithologies, including sediments, basalts, and topography variations of the Moho discontinuity, we calculate their gravity effects and subsequently remove them from the complete Bouguer anomaly, leading to the development of our residual Bouguer anomaly map. This map highlights unknown anomalous masses within the lithosphere. To aid in the interpretation of these residual anomalies, we perform a 2D forward modeling. Based on our results, we propose new boundaries for the Paranapanema block and the Luiz Alves craton. Additionally, we propose that the Ponta Grossa swarm dike has a more substantial impact on the crust and lithosphere than previously considered, and delimit the region of influence of this magmatism in the lithosphere. Moreover, tectonic features such as the São Francisco paleocontinent and the Rio de La Plata craton appear to be associated with negative residual Bouguer anomaly regions. Furthermore, we identify and emphasize the significance of the Western Paraná Suture, which acts as a demarcation between the Paraná Basin region and the Pantanal and Chaco-Paraná basins. Remarkably, this suture appears to play a more important role in shaping the density structure of the southwest of South America than the age and tectonic history of the sedimentary basins.

show abstract

Interactions between tectonics, bedrock inheritance and geomorphic responses of rivers in a post-rifting upland (Ponta Grossa Arch region, Brazil)

Cited by 3 publications

References 62 publications

Cenozoic tectonic reactivation and its implications for landscape transience in southeastern Brazil

Cenozoic tectonic reactivation and its implications for landscape transience in southeastern Brazil

Cenozoic Morphotectonic Evolution of the Eastern Edge of Paraná Basin, Southern Brazil

Lithosphere density structure of southeastern South America sedimentary basins from the analysis of residual gravity anomalies

Contact Info

Product

Resources

About