Basement geology and its controls on the nucleation and growth of rift faults in the northern Campos Basin, offshore Brazil

Strugale, Michael; Schmitt, Renata da Silva; Cartwright, Joe

doi:10.1111/bre.12540

Cited by 21 publications

(18 citation statements)

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“…Rift phase 1 (RP1) took place over a crustal framework constituted of two distinct Precambrian basement domains (Strugale et al, 2021). In Figure 11, a cluster of faults with minor displacements (~200 m) can be seen to the east (i.e., the Guriri Fault System East branch—GFSE), in contrast with sparse faults with major displacements (~400 m up to 900 m) to the west (GFSN‐S), reflecting the duality in basement geology, whose implications for rift‐related strain are discussed in Strugale et al (2021).…”

Section: Resultsmentioning

confidence: 99%

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

Strugale

Cartwright

2022

Basin Research

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Section: Resultsmentioning

confidence: 99%

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

Strugale

Cartwright

2022

Basin Research

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“…BSF2 therefore includes the upper parts of the Saxothuringian parautochthonos (highly sheared parts of inner shelf facies) and lower parts of allochthons involved in Variscan tectonics. Similar intrabasement, high amplitude and dipping reflections are interpreted as orogenic and postorogenic shear zones in the Norwegian Caledonides (Phillips et al, 2016;Fazlikhani et al, 2017;Wrona et al, 2020), offshore Brazil (Strugale et al, 2021;Vasconcelos et al, 2019), offshore New Zealand (Collanega et al, 2019), and in the South China Sea (Ye et al, 2020). High amplitude and continuous reflections of BSF2 below the Münchberg nappe and across the FFS to the west are therefore interpreted as the W-SW extension of a Variscan detachment/shear zone transporting allochtonous nappes and underlying metasedimentary rocks W-SW, towards the Franconian Basin area.…”

Section: Basement Seismic Facies 2 (Bsf2)mentioning

confidence: 85%

Variscan structures and their control on latest to post-Variscan basin architecture; insights from the westernmost Bohemian Massif and SE Germany

Fazlikhani¹,

Bauer²,

Stollhofen³

2021

Preprint

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Abstract. The Bohemian Massif exposes structures and metamorphic rocks remnant from the Variscan Orogeny in Central Europe and is bordered by the Franconian Fault System (FFS) to the west. Across the FFS, possible presence of Variscan units and structures are buried by Permo-Mesozoic sedimentary rocks. We integrate existing DEKORP 2D seismic reflection, well and surface geological data with the newly acquired FRANKEN 2D seismic survey to investigate the possible westward continuation of Variscan tectonostratigraphic units and structures, and their influence on latest to post-Variscan basin development. Subsurface Permo-Mesozoic stratigraphy is obtained from available wells and are tied to seismic reflection profiles using a synthetic seismogram calculated from density and velocity logs. Below the sedimentary cover, three main basement units are identified using seismic facies descriptions that are compared with seismic reflection characteristics of exposed Variscan units east of the FFS. Our results show that Upper Paleozoic low-grade metasedimentary rocks and possible Variscan nappes are bounded and transported by Variscan shear zones to ca. 65 km west of the FFS. Basement seismic facies in the footwall of the Variscan shear zones are interpreted as Saxothuringian basement. We show that the location of normal fault-bounded latest to post-Variscan Upper Carboniferous-Permian basins are controlled by the geometry of underlying Variscan shear zones. Some of these Upper Carboniferous-Permian normal faults reactivated as steep reverse faults during the regional Upper Cretaceous inversion. Our results also highlight that reverse reactivation of normal faults gradually decreases west of the FFS.

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“…BSF2 therefore includes the upper parts of the Saxothuringian parautochthons (highly sheared parts of inner shelf facies) and lower parts of allochthons. Similar intra-basement, high-amplitude and dipping reflections are interpreted as orogenic and post-orogenic shear zones in the Norwegian Caledonides (Phillips et al, 2016;Fazlikhani et al, 2017;Wrona et al, 2020;Osagiede et al, 2019), offshore of Brazil (Strugale et al, 2021;Vasconcelos et al, 2019), offshore of New Zealand (Collanega et al, 2019;Phillips and McCaffrey, 2019), and in the South China Sea (Ye et al, 2020). High-amplitude and continuous reflections of BSF2 below the Münchberg Nappe and across the FFS to the west are therefore interpreted as the W-SW extension of a Variscan detachment and shear zone transporting allochthonous nappes and underlying metasedimentary rocks W-SW towards the Franconian Basin area.…”

Section: Basement Seismic Facies 2 (Bsf2)mentioning

confidence: 88%

Variscan structures and their control on latest to post-Variscan basin architecture: insights from the westernmost Bohemian Massif and southeastern Germany

Fazlikhani¹,

Bauer²,

Stollhofen³

2022

Solid Earth

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Abstract. The Bohemian Massif exposes structures and metamorphic rocks remnant from the Variscan orogeny in central Europe and is bordered by the Franconian Fault System (FFS) to the west. Across the FFS, Variscan units and structures are buried by Permo-Mesozoic sedimentary rocks. We integrate existing DEKORP 2D seismic reflection, well, and surface geological data with the newly acquired FRANKEN 2D seismic survey to investigate the possible westward continuation of Variscan tectonostratigraphic units and structures and their influence on latest to post-Variscan basin development. Subsurface Permo-Mesozoic stratigraphy is obtained from available wells and tied to seismic reflection profiles using a synthetic seismogram calculated from density and velocity logs. Below the sedimentary cover, three main basement units are identified using seismic facies descriptions that are compared with seismic reflection characteristics of exposed Variscan units east of the FFS. Our results show upper Paleozoic low-grade metasedimentary rocks and possible Variscan nappes bounded and transported by Variscan shear zones ca. 65 km west of the FFS. Basement seismic facies in the footwall of the Variscan shear zones are interpreted as Cadomian basement and overlaying Paleozoic sequences. We show that the location of normal fault-bounded latest to post-Variscan late Carboniferous–Permian basins are controlled by the geometry of underlying Variscan shear zones. Some of these late Carboniferous–Permian normal faults reactivated as steep reverse faults during the regional Upper Cretaceous inversion. Our results also highlight that reverse reactivation of normal faults gradually decreases west of the FFS.

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Basement geology and its controls on the nucleation and growth of rift faults in the northern Campos Basin, offshore Brazil

Abstract: This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

Cited by 21 publications

References 64 publications

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

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

Variscan structures and their control on latest to post-Variscan basin architecture; insights from the westernmost Bohemian Massif and SE Germany

Variscan structures and their control on latest to post-Variscan basin architecture: insights from the westernmost Bohemian Massif and southeastern Germany

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