Mesoproterozoic bimodal volcanism in SW Norway, evidence for recurring pre-Sveconorwegian continental margin tectonism

Brewer, T. S.; Åhäll, Karl‐Inge; Menuge, Julian F.; Storey, Craig; Parrish, Randall R.

doi:10.1016/j.precamres.2004.06.003

Cited by 78 publications

(33 citation statements)

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“…), with a suggested tectonic setting inboard of a subduction zone in a setting similar to the Granite-Rhyolite provinces in the mid-continental US (Slagstad et al, 2009). Other supracrustal sequences dated at 1260-1220 and 1170-1140 Ma are found across the HRB-TB, and are also related to extensional settings possibly inboard of a subduction margin (Bingen et al, 2002;Brewer et al,. 2004;Roberts et al 2011).…”

Section: Geological Settingmentioning

confidence: 97%

Sedimentary recycling in arc magmas: geochemical and U–Pb–Hf–O constraints on the Mesoproterozoic Suldal Arc, SW Norway

Roberts

Slagstad

Parrish

et al. 2012

Contrib Mineral Petrol

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The Hardangervidda-Rogaland Block within southwest Norway is host to ~1.52-1.48 Ga continental building, and variable reworking during the ~1.1-0.9 Ga Sveconorwegian orogeny. Due to the lack of geochronological and geochemical data, the timing and tectonic setting of early Mesoproterozoic magmatism has long been ambiguous. This paper presents zircon U-Pb-Hf-O isotope data combined with whole-rock geochemistry to address the age and petrogenesis of basement units within the Suldal region, located in the centre of the Hardangervidda-Rogaland Block. The basement comprises variably deformed grey gneisses and granitoids that petrologically and geochemically resemble mature volcanic arc lithologies.U-Pb ages confirm that magmatism occurred from ~1521 to 1485 Ma, and conspicuously lack any xenocrystic inheritance of distinctly older crust. Hafnium isotope data range from εHf (initial) +1 to +11, suggesting a rather juvenile magmatic source, but with possible involvement of late Palaeoproterozoic crust. Oxygen isotope data range from mantle-like (δ 18 O ~5‰) to elevated (~10‰) suggesting involvement of low-temperature altered material (e.g. supracrustal rocks) in the magma source. The Hf-O isotope array is compatible with mixing between mantle-derived material with young low-temperature altered material (oceanic crust/sediments) and older low-temperature altered material (continent-derived sediments). This, combined with a lack of xenoliths and xenocrysts, exposed older crust, AFC trends and S-type geochemistry, all point to mixing within a deep-crustal magma-generation zone. A proposed model comprises accretion of altered oceanic crust and the overlying sediments to a pre-existing continental margin, underthrusting to the magma generation zone, and remobilisation during arc magmatism. The geodynamic setting for this arc magmatism is comparable to that seen in the Phanerozoic (e.g. the Sierra Nevada and Coast ranges batholiths), with compositions in the Suldal Sector reaching those of average upper continental crust. As within these younger examples, factors that drive magmatism towards the composition of the average continental crust include the addition of sedimentary material to magma source regions, and delamination of cumulate material. Underthrusting of sedimentary materials and their subsequent involvement in arc magmatism is perhaps a more widespread mechanism involved in continental growth than is currently recognized. Finally, the Suldal Arc magmatism represents a significant juvenile crustal addition to SW Fennoscandia.

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Section: Geological Settingmentioning

confidence: 97%

Sedimentary recycling in arc magmas: geochemical and U–Pb–Hf–O constraints on the Mesoproterozoic Suldal Arc, SW Norway

Roberts

Slagstad

Parrish

et al. 2012

Contrib Mineral Petrol

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“…Dons, 1960;1972;Sigmond, 1978) that can be separated into several temporally distinct volcanic and sedimentary basins ranging from ~1.5 to 1.1 Ga in age (e.g. Bingen et al, 2002Bingen et al, , 2003Brewer et al, 2004;Laajoki et al, 2002;Bingen et al, 2008;Pedersen et al, 2009;Roberts et al, 2011). A number of terminologies and groupings have been proposed for this suite of supracrustal rocks, and here we follow the terminology of Laajoki et al (2002).…”

Section: Geologic Settingmentioning

confidence: 99%

“…Several distinct phases of Mesoproterozoic intra-continental extension and associated bimodal volcanism are present in southern Norway: for example, the ~1.26-1.21 Ga Saesvatn-Valldal Group (Bingen et al, 2002;Brewer et al, 2004), ~1.23 Ga Grøssae-Totak belt (Sigmond, 1978;Roberts et al, 2011), < 1.12 Ga Ofte, Morgedal, and Gjuve formations (Brewer et al, 2002;Laajoki et al, 2002;Bingen et al, 2003, herein), and the <1.22 Ga Byglandsfjorden supracrustals (Pedersen et al, 2009) Brewer, et al, 2004;Roberts et al, 2011). This is consistent with geodynamic models that join the leading margins of Fennoscandia, Laurentia, and Amazonia as part of a long-lived (> 600 Ma) retreating accretionary margin (Zhao et al, 2004;Whitmeyer and Karlstrom, 2007;Johansson, 2009;Condie, 2013;Roberts, 2013).…”

Section: Implications For Tectonic Modelsmentioning

confidence: 99%

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Intermontane basins and bimodal volcanism at the onset of the Sveconorwegian Orogeny, southern Norway

Spencer

Cawood

Hawkesworth

et al. 2014

Precambrian Research

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“…These works are necessary for evaluating the correlation schemes and diverse tectonic models proposed to these formations in recent literature (e.g. Falkum & Pedersen, 1980;Starmer, 1983;de Haas et al, 1999;Bingen et al, 2001;2003;2005;Brewer et al, 2004;Andersen, 2005a).…”

Section: Discussionmentioning

confidence: 99%

The mesoproterozoic sub-Lifjell unconformity, central Telemark, Norway

Laajoki¹

2006

Bull Geol Soc Finland

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The sub-Lifjell unconformity subdivides the traditional Seljord group of the Telemark supracrustals, south Norway, into the Vindeggen and Lifjell groups. It is defi ned by an in situ weathering breccia and an angular unconformity above quartzites of the <1 500 -> 1155 Ma old Vindeggen group and by a volcaniclastic palaeoregolith developed above the 1155±2 Ma old porphyry of the Brunkeberg formation. Due to the complex deformation of the Vindeggen and Lifjell groups this unconformity has often been sheared or cut by faults, which impedes its use as a lithostratigraphic boundary. Dated porphyries under and above the Lifjell group defi ne the age of the sub-Lifjell unconformity between 1155±2 Ma and 1145±4 Ma indicating that the part of the unconformity developed above the Brunkeberg formation represents a relatively short time gap (<10 Ma). The part of the unconformity developed above the Vindeggen group represents a substantially larger time gap, for the Vindeggen group was folded before the extrusion of the Brunkeberg porphyry. This time duration cannot be, however, approximated more closely as the ages of the sedimentation and folding of the Vindeggen group are not known. In the terms of sequence stratigraphy, the sub-Lifjell unconformity defi nes the lower bounding surface of an extensive Mesoproterozoic beach-shallow self sequence.

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Mesoproterozoic bimodal volcanism in SW Norway, evidence for recurring pre-Sveconorwegian continental margin tectonism

Cited by 78 publications

References 50 publications

Sedimentary recycling in arc magmas: geochemical and U–Pb–Hf–O constraints on the Mesoproterozoic Suldal Arc, SW Norway

Sedimentary recycling in arc magmas: geochemical and U–Pb–Hf–O constraints on the Mesoproterozoic Suldal Arc, SW Norway

Intermontane basins and bimodal volcanism at the onset of the Sveconorwegian Orogeny, southern Norway

The mesoproterozoic sub-Lifjell unconformity, central Telemark, Norway

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