Structural and temporal evolution of a reactivated brittle–ductile fault – Part II: Timing of fault initiation and reactivation by K–Ar dating of synkinematic illite/muscovite

Torgersen, Espen; Viola, Giulio; Zwingmann, Horst; Harris, Chris

doi:10.1016/j.epsl.2014.09.031

Cited by 56 publications

(85 citation statements)

References 55 publications

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“…Thus, we argue that 1250 late/post-Caledonian extensional faulting linked to the collapse of the Caledonides essentially took place in the Mid/Late Devonian-Carboniferous and came to a halt towards the end of the late Carboniferous (Figure 10d). This presumed timing is consistent with recent K/Ar radiometric dating of brittle fault gouges in Western Troms (Davids et al, 2013) and in NW Finnmark (Torgersen et al, 2014;Koehl et al, 2016), as well as with radiometric dating of dolerite dykes in 1255 NW Finnmark (Lippard & Prestvik, 1997), eastern Finnmark (Guise & Roberts, 2002) and on the Kola Peninsula in Russia (Roberts & Onstott, 1995), which constrain significant extensional faulting activity onshore northern Norway and adjacent areas in Russia to the Late Devonianearly/mid Permian. Minor reactivation of major fault complexes occurred in the MesozoicCenozoic and are most likely associated with the rifting of the NE Atlantic (Faleide et al, 2008).…”

Section: Late Paleozoic Evolution Of the Sw Barents Sea Margin 1165supporting

confidence: 60%

“…The absolute age of post-Caledonian brittle faults onshore NW Finnmark is poorly constrained although a few contributions provide valid insights (Lippard & Prestvik, 1997;Davids et al, 2013;Torgersen et al, 2014;Koehl et al, 2016). Torgersen et al (2014) performed K/Ar dating of brittle fault gouge in the footwall of the LVF and obtained dominantly Carboniferous to 315 early Permian ages, as well as a subsidiary Early Cretaceous age for one of the faults.…”

Section: Absolute Age Dating Of Post-caledonian Faultsmentioning

confidence: 99%

“…Torgersen et al (2014) performed K/Ar dating of brittle fault gouge in the footwall of the LVF and obtained dominantly Carboniferous to 315 early Permian ages, as well as a subsidiary Early Cretaceous age for one of the faults. Roberts et al (1991) and Lippard & Prestvik (1997) presented indirect evidence of early Carboniferous dolerite dykes emplaced along and cementing WNW-ESE trending brittle fault segments of the TKFZ onshore Magerøya.…”

Section: Absolute Age Dating Of Post-caledonian Faultsmentioning

confidence: 99%

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Mid/Late Devonian-Carboniferous collapse basins on the Finnmark Platform and in the southwesternmost Nordkapp basin, SW Barents Sea

Koehl¹,

Bergh²,

Henningsen³

et al. 2017

Preprint

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Section: Late Paleozoic Evolution Of the Sw Barents Sea Margin 1165supporting

confidence: 60%

Section: Absolute Age Dating Of Post-caledonian Faultsmentioning

confidence: 99%

Section: Absolute Age Dating Of Post-caledonian Faultsmentioning

confidence: 99%

See 1 more Smart Citation

Mid/Late Devonian-Carboniferous collapse basins on the Finnmark Platform and in the southwesternmost Nordkapp basin, SW Barents Sea

Koehl¹,

Bergh²,

Henningsen³

et al. 2017

Preprint

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“…The absolute age of post-Caledonian brittle faults in NW Finnmark is poorly constrained, although a few contributions provide valid insights (Lippard and Prestvik, 1997;Davids et al, 2013;Torgersen et al, 2014;Koehl et al, 2016). Torgersen et al (2014) performed K-Ar dating of brittle fault gouge in the footwall of the LVF and obtained dominantly Carboniferous to early Permian ages, as well as a subsidiary Early Cretaceous age for one of the faults.…”

Section: Absolute Age Dating Of Post-caledonian Faultingmentioning

confidence: 99%

“…Torgersen et al (2014) performed K-Ar dating of brittle fault gouge in the footwall of the LVF and obtained dominantly Carboniferous to early Permian ages, as well as a subsidiary Early Cretaceous age for one of the faults. Roberts et al (1991) and Lippard and Prestvik (1997) presented indirect evidence of early Carboniferous dolerite dykes emplaced along and sealing WNW-ESE-trending brittle fault segments of the TKFZ on Magerøya, thus providing a minimum estimate for the latest stage of faulting along this fault.…”

Section: Absolute Age Dating Of Post-caledonian Faultingmentioning

confidence: 99%

Middle to Late Devonian–Carboniferous collapse basins on the Finnmark Platform and in the southwesternmost Nordkapp basin, SW Barents Sea

et al. 2018

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Abstract. The SW Barents Sea margin experienced a pulse of extensional deformation in the Middle-Late Devonian through the Carboniferous, after the Caledonian Orogeny terminated. These events marked the initial stages of formation of major offshore basins such as the Hammerfest and Nordkapp basins. We mapped and analyzed three major fault complexes, (i) the Måsøy Fault Complex, (ii) the Rolvsøya fault, and (iii) the Troms-Finnmark Fault Complex. We discuss the formation of the Måsøy Fault Complex as a possible extensional splay of an overall NE-SW-trending, NW-dipping, basement-seated Caledonian shear zone, the Sørøya-Ingøya shear zone, which was partly inverted during the collapse of the Caledonides and accommodated top-NW normal displacement in Middle to Late Devonian-Carboniferous times.

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Complex Bedrock Fracture Patterns: A Multipronged Approach to Resolve Their Evolution in Space and Time

Scheiber

Viola

2018

Tectonics

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The complex fault and fracture patterns commonly observed in metamorphic terranes are the cumulative expression of repeated episodes of brittle deformation. The temporal sequence of deformation remains, however, often obscure due to the general lack of systematic overprinting relationships and absolute geochronological constraints. Here we present a multipronged approach combining remote sensing, field work, structural analysis, and paleostress inversion with mineralogical characterization and K‐Ar dating of brittle features to develop an evolutionary model for one such complex fracture pattern. We applied this methodological approach to pervasively fractured Early to Middle Ordovician intrusive rocks in the northern Bømlo islands, SW Norway. The local brittle structural record is interpreted as reflecting a sequence of six deformation stages, three ascribable to the Caledonian orogenic cycle and three to the rift evolution of the North Sea. The Caledonian structures are assigned to (1) Late Ordovician NNW‐SSE transpression, (2) Silurian ESE‐WNW compression, and (3) Devonian NW‐SE transtension. The rift‐related structures formed during (4) Permian to Middle Triassic ENE‐WSW extension (~ 290–245 Ma), (5) Late Triassic to Late Jurassic E‐W extension (~ 210–160 Ma), and (6) Early Cretaceous ESE‐WNW extension (~ 125 Ma). The reconstructed gradual rotation of the extensional stress field during the Mesozoic might reflect the continuous northward migration of the rift activity from the North Sea toward the mid‐Norwegian margin. Our multipronged approach may be applied to the unraveling of complex and commonly long brittle histories stored in exhumed metamorphic terranes elsewhere.

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Structural and temporal evolution of a reactivated brittle–ductile fault – Part II: Timing of fault initiation and reactivation by K–Ar dating of synkinematic illite/muscovite

Cited by 56 publications

References 55 publications

Mid/Late Devonian-Carboniferous collapse basins on the Finnmark Platform and in the southwesternmost Nordkapp basin, SW Barents Sea

Mid/Late Devonian-Carboniferous collapse basins on the Finnmark Platform and in the southwesternmost Nordkapp basin, SW Barents Sea

Middle to Late Devonian–Carboniferous collapse basins on the Finnmark Platform and in the southwesternmost Nordkapp basin, SW Barents Sea

Complex Bedrock Fracture Patterns: A Multipronged Approach to Resolve Their Evolution in Space and Time

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