Constraints for a structural subdivision of the Southwest Scandinavian Domain in Sweden

Larson, Sven Åke; Stigh, Jimmy; Lind, Gustaf

doi:10.1080/11035899801201085

Cited by 10 publications

(7 citation statements)

References 47 publications

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“…The Racken gneiss, to the west of the Mylonite Zone, crystallized 1590 AE 14 Ma to 1596 AE 11 Ma ago and was metamorphosed during the Pre-Sveconorwegian (CLbright zircon overgrowth) as well as during the Sveconorwegian (CL-dark zircon rims), in accordance with structural studies by Larson et al (1998) in the Western Segment. The ion probe dating results confirm earlier studies, showing that polymetamorphic gneisses to the west of the Mylonite Zone generally are ca.…”

Section: Resultssupporting

confidence: 79%

“…We consider the metamorphic mineral parageneses to be Sveconorwegian, in accordance with Persson (1986), who dated metamorphic titanite and biotite as well as the rehomogenization of the Rb-Sr system between 1.1 and 0.97 Ga in a tonalitic rock close to the site of the Racken gneisses. In the Western Segment the Sveconorwegian event overprinted earlier metamorphism characterized by veins and isoclinal folds, as described by Larson et al (1998).…”

Section: Western Segmentmentioning

confidence: 96%

“…0.97 Ga Sveconorwegian amphibolite facies parageneses (Cornell et al 1995), grading into granulite facies to the south, as described by Johansson et al (1991). Borås Segment gneisses are generally veined and banded, while in the Torsby Segment to the north, the degree of deformation and migmatization is usually lower (Larson et al 1998).…”

Section: The Sveconorwegian Province and The Mylonite Zonementioning

confidence: 96%

“…In the Western Segment, structural studies indicate a pre-Sveconorwegian and Sveconorwegian tectonothermal history, while in the Torsby Segment only Sveconorwegian overprinting is verified (e.g. Larson et al 1998). Thus, we expected to identify two types of metamorphic zircon in the Western Segment and one in the Torsby Segment.…”

Section: Introductionmentioning

confidence: 97%

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Emplacement ages and metamorphic overprinting of granitoids in the Sveconorwegian Province in V rmland, Sweden - an ion probe study

Larson¹,

Cornell²,

Armstrong³

1999

Norsk Geologisk Tidsskrift

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Emplacement ages and metamorphic overprinting of granitoids in the Sveconorwegian Province in Värmland, Sweden -an ion probe study.North of Lake Vänern in the Sveconorwegian province of Sweden, veined and banded grey to red granitoids characterize the Western Segment in western Värmland. Two gneiss samples from Rackstad, north of Arvika, yielded concordant U-Pb emplacement ages of 1596 AE 11 Ma and 1590 AE 14 Ma, respectively from zircon cores, while metamorphic zircon rims in one of the samples gave a weighted mean Pb-Pb age of 971 AE 8 Ma. Patches of metamorphic zircon overgrowth pre-dating the metamorphic rims indicate that an even older metamorphic event influenced this rock. East of the Mylonite Zone, a N-S-trending Sveconorwegian shear zone, more massive reddish granitoids occupy the segment between this zone and another N-S-trending Sveconorwegian shear zone, the Protogine Zone. A sample from Hänsjön, north of Torsby, yielded concordant ages with a weighted mean of 1689 AE 12 Ma. One grain has a Pb-Pb age of 1770 AE 29 Ma, which is inherited from the source of the granite, and is similar to the age of early magmatism in the Transscandinavian Igneous Belt, east of the Torsby Segment. These results confirm that north of Lake Vänern, the Torsby Segment was formed ca. 100 Ma earlier than the adjoining segment to the west, in accordance with previous results from further south.

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Section: Resultssupporting

confidence: 79%

Section: Western Segmentmentioning

confidence: 96%

Section: The Sveconorwegian Province and The Mylonite Zonementioning

confidence: 96%

Section: Introductionmentioning

confidence: 97%

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Emplacement ages and metamorphic overprinting of granitoids in the Sveconorwegian Province in V rmland, Sweden - an ion probe study

Larson¹,

Cornell²,

Armstrong³

1999

Norsk Geologisk Tidsskrift

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“…In the south, the ES is dominated by 1.66-1.71 Ga calcalkaline granitoids, which are in many places penetratively migmatized and tectonically banded (Larson et al 1986;Connelly et al 1996;Larson et al 1998;Austin Hegardt et al 2005;Möller et al 2007). These banded gneisses are presumably reworked equivalents of the 1.81-1.65 Ga Transscandinavian Igneous Belt (TIB; cf.…”

Section: Geological Settingmentioning

confidence: 95%

Mesoproterozoic (1.47–1.44 Ga) orogenic magmatism in Fennoscandia; Baddeleyite U–Pb dating of a suite of massif-type anorthosite in S. Sweden

Brander¹

2007

Int J Earth Sci (Geol Rundsch)

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The Jönköping Anorthositic Suite (JAS) in S. Sweden has characteristics typical for (Proterozoic) massiftype anorthosites. The interstitial liquid of these plagioclase-porphyritic rocks solidified at 1,455 ± 6 Ma, as determined by U-Pb isotope analysis of baddeleyite. The JAS developed during a regional 1.47-1.44 event in Fennoscandia that generated widespread mafic magmatism (basalts, and diabase dykes and sills) in the north and emplacement of felsic plutons in the south. The event of 1.47-1.44 Ga magmatism in Fennoscandia largely coincides in age with dynamic high-grade metamorphism in SW Sweden and was probably related to convergent activemargin processes during the Danopolonian orogeny.

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Character and origin of variably deformed granitoids in central southern Sweden: implications from geochemistry and Nd isotopes

et al. 2011

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We present major and trace element data for eighteen 1.71-1.66 Ga granitoid samples, and Sm-Nd whole-rock isotope data for eleven of these samples, in a transect across the border between the Transscandinavian Igneous Belt (TIB) and the Eastern Segment in central southern Sweden. The geochemistry of the granitoids varies from alkalic to alkali-calcic and peraluminous in the east to predominantly calc-alkaline and metaluminous in the west. Rocks in the west also have lower SiO 2 contents. Trace element signatures favour formation in an active continental margin setting. Nd isotope data are completely overlapping along the transect and initial ε Nd values are mildly depleted in the range +0.3 to +2.6. The combined data suggest that the magmas were derived mainly from juvenile, pre-existing crust, increasingly mafic and less alkaline towards the west. Copyright

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Constraints for a structural subdivision of the Southwest Scandinavian Domain in Sweden

Cited by 10 publications

References 47 publications

Emplacement ages and metamorphic overprinting of granitoids in the Sveconorwegian Province in V rmland, Sweden - an ion probe study

Emplacement ages and metamorphic overprinting of granitoids in the Sveconorwegian Province in V rmland, Sweden - an ion probe study

Mesoproterozoic (1.47–1.44 Ga) orogenic magmatism in Fennoscandia; Baddeleyite U–Pb dating of a suite of massif-type anorthosite in S. Sweden

Character and origin of variably deformed granitoids in central southern Sweden: implications from geochemistry and Nd isotopes

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