Sveconorwegian crustal underplating in southwestern Fennoscandia: LAM-ICPMS U–Pb and Lu–Hf isotope evidence from granites and gneisses in Telemark, southern Norway

Andersen, Tom; Griffin, William L.; Sylvester, Arthur G.

doi:10.1016/j.lithos.2006.03.068

Cited by 83 publications

(56 citation statements)

References 46 publications

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“…The starting point of this trend is at values near the Depleted Mantle line at 1,215 Ma (0.28233, epsilonHf = +12), which overlaps granitic and granodioritic gneisses from the Vrådal-Kviteseid area in central Telemark (Andersen et al 2007) in age and Hf isotopic composition. The younger, less radiogenic end of the trend straddles CHUR (0.28206) at 1,100 Ma.…”

Section: Lu-hf Isotope Datamentioning

confidence: 83%

“…11 Hf-isotope compositions versus age for samples analysed in this study. Reference data: * LAM-ICPMS data (zircon): Andersen et al (2002bAndersen et al ( , 2004aAndersen et al ( , 2007. ** ID-TIMS and ID-ICPMS data (baddeleiyite, zircon): Patchett et al (1981) and Söderlund et al (2006) indicating real variation in initial Hf-isotopic composition in the magma (e.g.…”

Section: Lu-hf Isotope Datamentioning

confidence: 99%

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Recurrent mesoproterozoic continental magmatism in South-Central Norway

Pedersen

Andersen

Konnerup-Madsen

et al. 2008

Int J Earth Sci (Geol Rundsch)

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We report U-Pb dates and Lu-Hf isotope data, obtained by LAM-ICPMS, for zircons from metamorphic rocks of the Setesdalen valley, situated in the Telemark block south of the classic Telemark region of southern Norway. The samples include infracrustal rocks from the metamorphic basement, metaigneous rocks and metasediments from the Byglandsfjorden supracrustal cover sequence, and metaigneous rocks which intruded the whole succession. The main crustal evolution took place from 1,550-1,020 Ma, beginning with the emplacement of juvenile tonalitic melts; the contribution of older crustal material increased with time. Around 1,320 Ma, further addition of juvenile material occurred, involving both mafic and felsic melts, metamorphism and deformation. Acid magmas with high FeO*/MgO were intruded at 1,215 Ma, coinciding with underplating elsewhere in South Norway. The period starting at 1,215 Ma is represented by supracrustal rocks, principally metarhyolites with minor mafic material and immature sediments of the Byglandsfjorden Group. The crust generation processes ended with the intrusion of diorites and granodiorites at 1,030 Ma, late in the Sveconorwegian orogeny. Regional processes of metamorphism and deformation (around 1,290 and 1,000 Ma) can be related to the assembly of Rodinia.

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Section: Lu-hf Isotope Datamentioning

confidence: 83%

Section: Lu-hf Isotope Datamentioning

confidence: 99%

Recurrent mesoproterozoic continental magmatism in South-Central Norway

Pedersen

Andersen

Konnerup-Madsen

et al. 2008

Int J Earth Sci (Geol Rundsch)

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“…This implies that: (i) these two depocentres were receiving similar age detritus but derived from different source rocks via discrete drainage systems (see also Lamminen et al, 2011); and (ii) the average Hf isotopic composition of the Lake Vrådal region are more depleted than those north of Lake Bandak. However, the wide spread in published zircon Hf values from the Telemark region do not provide the resolution necessary to discriminate specific sources for the detrital zircons in this study (see Andersen et al, 2002;Andersen et al, 2007;Andersen et al, 2009;Pedersen et al, 2009;Lamminen and Köykkä, 2010;Bingen et al, 2011; A c c e p t e d M a n u s c r i p t 18 . Furthermore, oxygen isotopes in the Sveconorwegian-age zircons analyzed show that the host magmas were derived from a source that had assimilated an appreciable amount of supracrustal material driving their compositional trends to higher (Fig.…”

mentioning

confidence: 78%

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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“…Whole-rock isotope and in-situ zircon isotope studies on Sveconorwegian magmatism indicate addition of an older crustal component that has a model age of >1.7 Ga, and a mantle component that is 1.2 Ga and/or younger (Andersen et al, 2001;2002b;2007b;2009b;Andersen & Griffin, 2004;Pedersen et al, 2009). These data were used to suggest a 1.7-1.9 Ga TIB-like lower crust that extends under the whole of southern Norway (Andersen et al, 2009b), and also to imply an indigenous rather than exotic origin for the Telemark Block (Andersen et al, 2002b;2004a;Pedersen et al, 2009).…”

Section: Geological Settingmentioning

confidence: 99%

“…The evolution of the ~1.7 to 1.5 Ga crust can be described by two end-member models: 1) Palaeoproterozoic crust underlies the entire region and has been recycled during younger magmatic episodes (Andersen et al, 2002b;2004a;2009b), or 2) the various terranes represent accreted juvenile arcs with limited contribution from older material (Brewer et al, 1998;Åhäll & Connelly, 2008). Various isotope data point to a contribution from Palaeoproterozoic crust to both Gothian aged (~1.7-1.55 Ga) and Sveconorwegian magmatism (1.2-0.93 Ga; Andersen, 1997;Andersen et al, 2001;2002b;2004a;2007b;2009b;Andersen & Griffin 2004;Pedersen et al, 2009). In the Hardangervidda-Rogaland and Telemark Blocks, ~1.5 Ga units are widespread and are the oldest exposed crust currently dated (Bingen et al, 2005;2008b;Pedersen et al, 2009), but are hitherto poorly understood.…”

mentioning

confidence: 99%

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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Sveconorwegian crustal underplating in southwestern Fennoscandia: LAM-ICPMS U–Pb and Lu–Hf isotope evidence from granites and gneisses in Telemark, southern Norway

Cited by 83 publications

References 46 publications

Recurrent mesoproterozoic continental magmatism in South-Central Norway

Recurrent mesoproterozoic continental magmatism in South-Central Norway

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

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

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