Precambrian geochronology of south-eastern Sweden

Åberg, Göran

doi:10.1080/11035897809454454

Cited by 106 publications

(34 citation statements)

References 37 publications

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“…As a matter of fact, the small size of the leptite zircons, compared with those in the granite, could make them lose uranium more easily due to their larger surface/volume ratio. The two obtained ages, 1873 (alternatively 1925) and 1900 Ma, are in agreement with the time interval of 1900 to 1845 Ma found from U-Pb zircon dating of other synorogenic Svecokarelian rocks in central Sweden (Aberg 1978;Welin 1979;Welin et al 19800, 1980b;Aberg et al 1983). …”

Section: Discussionsupporting

confidence: 82%

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Zircon ages of metavolcanic and synorogenic granitic rocks from the Svärdsjö and Yxsjöberg areas, south central Sweden

Åberg¹,

Levi²,

Fredrikson³

1983

Geologiska Föreningen i Stockholm Förhandlingar

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Section: Discussionsupporting

confidence: 82%

“…Quoted ages are recalculated using these constants. Analytical procedures and errors are given in Aberg (1978) and \Velin et al (1980a). The zircon data were corrected for a total lead blank of 5 ng and common lead correction of 206/203=15.79,207/203=15.35 and 208/204=35.02 (Wickman et al 1963).…”

Section: Analytical Procedures and Resultsmentioning

confidence: 99%

Zircon ages of metavolcanic and synorogenic granitic rocks from the Svärdsjö and Yxsjöberg areas, south central Sweden

Åberg¹,

Levi²,

Fredrikson³

1983

Geologiska Föreningen i Stockholm Förhandlingar

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“…The initial 87 Sr/ 86 Sr ratio of 0.7018 anyhow is too low to correspond with the strontium ratio of the original acid intrusive rock. 87 Sr/ 86 Sr ratios of about 0.703-0.705 were reported for synkinematic intrusions of the Swedish Svecokarelides (Åberg 1978(Åberg , Welin et al 1980. Even on Archean gneisses of eastern Finland strontium ratios of 0.7023-0.7024 were measured (Martin et al 1983).…”

Section: Data Interpretation and Comparison With Existing Agesmentioning

confidence: 99%

Cooling history of the eastern Svecokarelides: whole-rock and mica Rb-Sr and hornblende K-Ar ages in the areas of Pihtipudas-Iisalmi and Joroinen-Sulkava, Finland

Haudenschild¹

1990

Bull Geol Soc Finland

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HAUDENSCHILD, UELI, 1990. Cooling history of the eastern Svecokarelides: whole-rock and mica Rb-Sr and hornblende K-Ar ages in the areas of Finland. Bull. Geol. Soc. Finland, 62, Part 1, Rb-Sr age determination on mica and whole-rock samples and K-Ar age determination on hornblendes were carried out to get information on the time of metamorphism and early cooling in two Proterozic areas of the Finnish Svecokarelides. In the Joroinen-Sulkava area (southern Finland) a whole-rock isochron of 1812 + 45Ma on metapelitic gneisses reflects the time of amphibolite-facies metamorphism. A 1875 + 17Ma whole-rock isochron on a quartz-diorite of the granulite-facies Pielavesi area (central Finland) may date an earlier high-grade metamorphic event, the low 87Sr/86Sr initial ratio of 0.7018 can be explained only by a shift or rotation of the isochron postdating its age. The disturbation of the whole-rock system could be related to the 1800-1820Ma metamorphism dated in the Joroinen-Sulkava area. A lower limit for the age of the isochron-shift is given by 1750-1790Ma biotite ages. The 1800-1820Ma metamorphic event seems to have been weaker in central than in southern Finland while the 1875Ma metamorphism seen in central Finland (Pielavesi) is absent or completely overprinted in the south.Muscovite Rb-Sr and hornblende K-Ar ages date the cooling of the areas to about 500°C. Muscovite ages vary between 1730Ma and 1770Ma for different localities. Five fractions of two hornblende samples define an isochron of 1778Ma on the 40Ar/36Ar versus 40K/36Ar diagram. In one locality (Vieremä) the hornblende ages (1995-2143Ma) are remarkably higher than the age of the muscovite (1828Ma). The hornblende ages were interpreted as having a pre-metamorphic memory, being of Jatulian or late Archean origin. The blocking-temperature for argon in horblende therefore should be somewhat higher than the blocking-temperature of muscovite in respect to the Rb-Sr system.

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“…Kresten and Chyssler 1976;Å berg 1978), with mesoperthitic exsolution structures that can even be macroscopically identified (Fig. 5a).…”

Section: Microfabrics Of the Götemar Plutonmentioning

confidence: 99%

“…Kresten and Chyssler (1976) were the first to describe the rock suites and specify their geochemistry. However, the first age dating resulted in misleading ages for the Götemar Massif, ranging from 1.35 (Rb/Sr WR;Å berg 1978) Wahlgren et al 2004) and structural (e.g. faulting; Viola and Ganerød 2007;Drake et al 2009) data were obtained, mainly for the TIB host rocks (reports available on the SKB homepage: http:// www.skb.se).…”

Section: Geological Settingmentioning

confidence: 99%

Multi-stage emplacement of the Götemar Pluton, SE Sweden: new evidence inferred from field observations and microfabric analysis, including cathodoluminescence microscopy

Friese

Vollbrecht

Tanner

et al. 2011

Int J Earth Sci (Geol Rundsch)

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The emplacement of the Mesoproterozoic Götemar Pluton into Paleoproterozoic granitoid host rocks of the Transscandinavian Igneous Belt is re-examined by microfabric analysis, including cathodoluminescence microscopy. Field data on the pluton-host rock system are used to strengthen the model. The Götemar Pluton, situated on the Baltic Shield of SE Sweden, is a horizontally zoned tabular structure that was constructed by the intrusion of successive pulses of magma with different crystal/melt ratios, at an estimated crustal depth of 4-8 km. Initial pluton formation involved magma ascent along a vertical dike, which was arrested at a mechanical discontinuity within the granitoid host rocks; this led to the formation of an initial sill. Subsequent sill stacking and their constant inflation resulted in deformation and reheating of existing magma bodies, which also raised the pluton roof. This multi-stage emplacement scenario is indicated by complex dike relationships and the occurrence of several generations of quartz (Si-metasomatism). The sills were charged by different domains of a heterogeneous magma chamber with varying crystal/melt ratios. Ascent or emplacement of magma with a high crystal/melt ratio is indicated by syn-magmatic deformation of phenocrysts. Complex crystallization fabrics (e.g. oscillatory growth zoning caused by high crystal defect density, overgrowth and replacement features, resorbed and corroded crystal cores, rapakivi structure) are mostly related to processes within the main chamber, that is repeated magma mixing or water influx.

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Precambrian geochronology of south-eastern Sweden

Cited by 106 publications

References 37 publications

Zircon ages of metavolcanic and synorogenic granitic rocks from the Svärdsjö and Yxsjöberg areas, south central Sweden

Zircon ages of metavolcanic and synorogenic granitic rocks from the Svärdsjö and Yxsjöberg areas, south central Sweden

Cooling history of the eastern Svecokarelides: whole-rock and mica Rb-Sr and hornblende K-Ar ages in the areas of Pihtipudas-Iisalmi and Joroinen-Sulkava, Finland

Multi-stage emplacement of the Götemar Pluton, SE Sweden: new evidence inferred from field observations and microfabric analysis, including cathodoluminescence microscopy

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