The Piúma lineament, southern Espirito Santo: structural expression and tectonic significance

Abstract

ABSTRACT:The Piúma lineament, located in the Southern Espírito Santo State, Brazil, is one of the most prominent linear morphostructural features of the northern Mantiqueira Province. The lineament stands out in satellite images and topographic maps, extending for about 70 km in a N50°W direction, between the towns of Iconha and Conceição do Castelo (Espírito Santo). In order to investigate the nature and role played by the Piúma lineament in the tectonic evolution of the Mantiqueira Province and adjacent Campos Basin, we carried out a detailed structural analysis based on fieldwork, as well as geophysical data processing and interpretation. The results we obtained indicate that the Piúma lineament is a brittle shear zone characterized by N50W-trending and SW-dipping shear fractures, faults and joints. These structures record two distinct and incompatible motions, thereby recording the operation of two tectonic regimes: NNE-SSW extension and E-W transtension. Comparing our results with the literature on the Southeastern Brazilian Continental Margin, we conclude that the Piúma lineament more likely developed after the Ediacaran Brasiliano orogenic event in response to an NNE-SSW extension, experiencing later a reactivation as normal dextral to dextral transtensional zone, probably in connection with the South Atlantic rifting in the Lower Cretaceous. KEYWORDS:Remote sensing; Fractures; Paleostress analysis. RESUMO: O lineamento Piúma, situado na porção sul do estado do Espírito Santo, está entre as feições morfo-estruturais mais proeminentes da província Mantiqueira Setentrional. Constitui uma feição linear regional, bem marcada em imagens de sensoriamento remoto e mapas topográficos, com aproximadamente 70 km de comprimento e direção N50°W, entre as cidades de Iconha e Conceição do Castelo (Espírito Santo). Para investigar sua natureza e o papel que desempenha na evolução tectônica da Província Mantiqueira e da bacia de Campos

Multisource data integration for groundwater prospecting in Precambrian shear zones, Espírito Santo State (Southeastern Brazil)

“…Calegari et al, (2016) recognized a NWtrending Lineament in the Espírito Santo southeastern margin, named as the Alegre Fracture Zone, originated in the Cambrian Period and reactivated in the Cenozoic Era. Lourenço et al (2016) obtained similar results for the Piúma lineament, a 70 km long and N50W-trending brittle shear zone. Maizatto et al (2009) apud Chemale Jr & Hadler (2005) based on apatite fission tracks analysis, recognized an important tectonic event during 80-60 Ma in the south-central Espírito Santo State, which caused a regional uplift that reached up to 3,000 m.…”

“…NE-trending lineaments coincides with the orientation of ductile structures of the Precambrian crystalline basement rocks. NW-trending structures are associated to the opening and evolution of the South Atlantic Ocean (Calegrari et al, 2016;Lourenço et al, 2016). Hartwig and Bozzi (2019) recognized more than one hundred NW and NE-trending fractures in the semi-consolidate Miocene sediments of the Barreiras Formation in the southern margin of the Espírito Santo State showing that both sets were reactivated in recent times.…”

Tectono‐stratigraphic evolution of the rift and post‐rift systems in the Northern Campos Basin, offshore Brazil

“…Two sets of fractures and dyke swarms striking NW to NNW transverse to the basement metamorphic grain in the onshore basement have their offshore projections close to the study area (Almeida et al, 2021): the NNW-SSE Vitória-Colatina lineament (Chang et al, 1992) and the Piúma/Itaoca (Castelo) lineaments (Lourenço et al, 2016;Santiago et al, 2020) (Figure 1). In common, these structures demonstrate a polyphase evolution, with alkaline dykes being emplaced during the Cambrian, and tholeiitic dykes in the Early Cretaceous age (see age compilation in Pessano et al, 2021).…”

“…The dykes are interpreted as the result of the orogenic collapse of the Araçuaí Belt during the Cambrian and the opening of the South Atlantic Ocean during Early Cretaceus respectively. Therefore, they show recurrent episodes of brittle deformation of which precise timing and kinematic relations remain unclear (Calegari et al, 2016; Lourenço et al, 2016; Santiago et al, 2020).…”

Filling Materials in Brittle Structures as Indicator of Cenozoic Tectonic Events in Southeastern Brazil

“…It is considered of Cambrian age, but with distensive reactivation movements that occurred during the rift phase and at the Cenozoic. The Piúma Lineament, another structure that is prominent in the area, was described as a brittle shear zone, with NW-SE striking dipping to SW (Lourenço et al, 2016). According to these authors, it was originated in a post-Brazilian event that promoted NNE-SSW distension and was reactivated most probably in the South Atlantic opening as a normal dextral to transtensional dextral shear zone.…”