Morphometric and structural diagnosis of fault reactivation in the Cenozoic: a case study of the Blumenau-Soledade Lineament in southern Brazil

Salamuni, Eduardo; Silva, Clauzionor Lima da; Nascimento, Edenilson Roberto do; Santos, Jéssica Miranda dos; Peyerl, William Rudolf Lopes; Gimenez, Viviane Barbosa

doi:10.1590/2317-4889202120200080

Cited by 5 publications

(1 citation statement)

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“…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

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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.

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