Mid-Proterozoic magmatic arc evolution at the southwest margin of the Baltic Shield☆

Andersen, Tom; Griffin, William L.; Jackson, Simon E.; Knudsen, T.-L.; Pearson, Norman J.

doi:10.1016/j.lithos.2003.12.011

Cited by 135 publications

(95 citation statements)

References 58 publications

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“…A separate evolution between Telemarkia and the rest of the orogen, and their eventual collision, has been considered before (e.g., Bingen et al, 2005). Although controversial (e.g., Andersen et al, 2004), the concept may yet provide the best explanation for the conflicting tectonic features observed across the Sveconorwegian orogen.…”

Section: Discussionmentioning

confidence: 99%

The U–Pb age of the Finse batholith, a composite bimodal Sveconorwegian intrusion

Jensen¹,

Corfú²

2016

NJG

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The Sveconorwegian autochthonous basement in the Finse area, South Norway, comprises a c. 900 km 2 bimodal batholith, dominated by K-feldspar megacrystic granite. The granite is locally intermingling with gabbroic rocks, and cut by different generations of pegmatite and aplite dykes. Zircon U-Pb geochronological data obtained by ID-TIMS demonstrate that granite, granodiorite and gabbro are coeval, as they define a common upper intercept age of 985.6 ± 1.6 Ma, dating emplacement of the batholith. Titanite is variously disturbed by later Sveconorwegian events. Pegmatites cross-cutting all structures yield zircon and titanite ages of 976 ± 8 Ma, 939 ± 2, and possibly 958 ± 2 Ma, reflecting the latest stages of the evolution of the batholith. The Finse batholith is one of the earliest members of the widespread ferroan hornblende-biotite-granitoid (HBG) suite, in the western part of the Sveconorwegian orogen.

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Section: Discussionmentioning

confidence: 99%

The U–Pb age of the Finse batholith, a composite bimodal Sveconorwegian intrusion

Jensen¹,

Corfú²

2016

NJG

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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: 92%

“…underthrusting of continent-derived sediments into the deepcrustal/mantle melting region. The 1.6-1.55 Ga calc-alkaline granitoids and gneisses of the Bamble-Lillesand and Kongsberg-Marstrand blocks have similar moderately juvenile isotopic signatures (Andersen et al, 2002b;2004a), and thus seem likely candidates for continental arc rocks formed via processes similar to that of the Suldal Arc. If an accretionary orogen is envisaged for the 1.65-1.45 Ga period in SW Fennoscandia, as has been suggested by Åhäll & Connelly (2008), then one can imagine a collage of various immature volcanic arcs, ribbon continents, and continental arcs; all forming within the vicinity of the SW Fennoscandian margin, all originating as rifted fragments, and all possessing varying volumes of older crustal substrate.…”

Section: The Origin Of the Hardangervidda-rogaland And Telemark Blocksmentioning

confidence: 98%

“…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.…”

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confidence: 99%

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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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“…The oldest known rocks are orthogneisses ranging in age from ca. 1570 to 1460 Ma [44][45][46]. They are intruded by younger plutonic rocks, including a 1294 ± 38 Ma tonalite pluton [20], 1200 to 1150 Ma mafic and felsic plutonic rocks [20,45,46], ca.…”

Section: Geological Settingmentioning

confidence: 99%

Dynamic Metasomatism: Stable Isotopes, Fluid Evolution, and Deformation of Albitite and Scapolite Metagabbro (Bamble Lithotectonic Domain, South Norway)

et al. 2018

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New stable isotopic data from mineral separates of albite, scapolite, amphibole, quartz, and calcite of metasomatic rocks (Bamble lithotectonic domain) give increased knowledge on fluid type, source, and evolution during metamorphism. Albite from a variety of albitites gives18 O SMOW values of 5.1-11.1‰, while quartz from clinopyroxene-bearing albitite gives 11.5-11.6‰. 18 O SMOW values for calcite samples varies between 3.4 and 12.4‰ and shows more consistent 13 C values of −4.6 to −6.0‰. Amphibole from scapolite metagabbro yields a 18 O SMOW value of 4.3 to 6.7‰ and D SMOW value of −84 to −50‰, while the scapolite gives 18 O SMOW values in the range of 7.4 to 10.6‰. These results support the interpretation that the original magmatic rocks were metasomatised by seawater solutions with a possible involvement from magmatic fluids. Scapolitisation and albitisation led to contrasting chemical evolution with respect to elements like P, Ti, V, Fe, and halogens. The halogens deposited as Cl-scapolite were dissolved by albitisation fluid and reused as a ligand for metal transport. Many of the metal deposits in the Bamble lithotectonic domain, including Fe-ores, rutile, and apatite deposits formed during metasomatism. Brittle to ductile deformation concurrent with metasomatic infiltration illustrates the dynamics and importance of metasomatic processes during crustal evolution.

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Mid-Proterozoic magmatic arc evolution at the southwest margin of the Baltic Shield☆

Cited by 135 publications

References 58 publications

The U–Pb age of the Finse batholith, a composite bimodal Sveconorwegian intrusion

The U–Pb age of the Finse batholith, a composite bimodal Sveconorwegian intrusion

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

Dynamic Metasomatism: Stable Isotopes, Fluid Evolution, and Deformation of Albitite and Scapolite Metagabbro (Bamble Lithotectonic Domain, South Norway)

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