Influence of deformation bands on sandstone porosity: A case study using three-dimensional microtomography

Rodrigues, Mérolyn Camila Naves de Lima; Trzaskos, Bárbara; Lopes, Angela Pacheco

doi:10.1016/j.jsg.2015.01.003

Cited by 10 publications

(5 citation statements)

References 20 publications

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“…Therefore, the best way to characterize such heterogeneities (pore connectivity, fluid flow transport, and mechanical properties) is to adopt a fully 3D approach, which captures the real spatial distribution of grains and pores and minimize the uncertainty [18].…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Using synchrotron X-ray microtomography to characterize the pore network of reservoir rocks: A case study on carbonates

Arzilli

Cilona

Mancini

et al. 2016

Advances in Water Resources

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Section: Accepted Manuscriptmentioning

confidence: 99%

Using synchrotron X-ray microtomography to characterize the pore network of reservoir rocks: A case study on carbonates

Arzilli

Cilona

Mancini

et al. 2016

Advances in Water Resources

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“…Extension in a NE-SW direction, which is also evident from the margin-perpendicular orientation 221 of deformation bands in the Botucatu formation (Rodrigues et al, 2015), produced widespread 222 pathways for dyke intrusion in a NW-SE direction. In this setting, the NE-SW trending 223…”

mentioning

confidence: 99%

Asymmetric continental deformation during South Atlantic rifting along southern Brazil and Namibia

2017

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12Plate restoration of South America and Africa to their pre-breakup position faces the 13 problem of gaps and overlaps between the continents, an issue commonly solved with 14 implementing intra-plate deformation zones within South America. One of these zones is often 15 positioned at the latitude of SE/S Brazil. However, geological evidence for the existence of a 16 distinct zone in this region is lacking, which is why it remains controversial and is not included in 17 all modeling studies. In order to solve this problem we present a study of multiple geological 18 aspects of both parts of the margin, SE/S Brazil and its conjugate part NW Namibia at the time of 19 continental breakup. Our study highlights pronounced differences between these regions with 20 respect to Paraná-Etendeka lava distribution, magmatic dyke emplacement, basement 21 reactivation, and fault patterns. In Namibia, faults and dykes reactivated the rift-parallel 22Neoproterozoic basement structure, whereas such reactivation was scarce in SE/S Brazil. Instead, 23 most dykes, accompanied by small-scale grabens, are oriented margin-perpendicular along the 24 margin from northern Uruguay to São Paulo. We propose that these differences are rooted in 25 large-scale plate movement and suggest a clockwise rotation of southern South America away 26 from a stable northern South America and Africa, in a similar way as proposed by others for a 27Patagonian continental section just prior to South Atlantic rifting. This rotation would produce 28 margin-parallel extension in SE/S Brazil forming margin-perpendicular pathways for lava 29 extrusion and leading to the asymmetric distribution of the Paraná-Etendeka lavas. NW Namibia 30 instead remained relatively stable and was only influenced by extension due to rifting, hot spot 31 activity, and mantle upwelling. Our study argues for significant margin-parallel extension in SE/S 32 Brazil, however not confined to a single distinct deformation zone, but distributed across ~1000 33 km along the margin. 34 35

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“…Published results on three-dimensional microtomography of deformation bands concern aeolian sandstones showing high mineralogical and textural maturity (Rodrigues et al 2015). In contrast, studied flysch sandstones show large diversity of their mineral composition.…”

mentioning

confidence: 99%

“…According to Rodrigues et al (2015) sample dimensions of 15 × 10 × 10 mm are sufficient to determine the porosity of deformation bands.…”

mentioning

confidence: 99%

Identification of tectonic microstructures in flysch sandstones of the Outer Carpathians using X-ray nanotomography and nuclear magnetic resonance – first results

Radzik¹,

Świerczewska²,

Krzyżak³

2015

geol

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Influence of deformation bands on sandstone porosity: A case study using three-dimensional microtomography

Cited by 10 publications

References 20 publications

Using synchrotron X-ray microtomography to characterize the pore network of reservoir rocks: A case study on carbonates

Using synchrotron X-ray microtomography to characterize the pore network of reservoir rocks: A case study on carbonates

Asymmetric continental deformation during South Atlantic rifting along southern Brazil and Namibia

Identification of tectonic microstructures in flysch sandstones of the Outer Carpathians using X-ray nanotomography and nuclear magnetic resonance – first results

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