The deformation history of the eastern part of the southwest Swedish gneiss belt

Larson, Sven Åke; Stigh, Jimmy; Tullborg, Eva‐Lena

doi:10.1016/0301-9268(86)90075-6

Cited by 69 publications

(13 citation statements)

References 28 publications

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“…Since new zircon U-Pb datings show that at least substantial parts of the TGPB were contemporaneous with the late Svecofennian granites (PATCHETT et al, 1987;]ARL & JOHANSSON, 1988;SKIOLD, 1988), and the same pattern of crustal fractures zones apparently controlled their emplacement, it is likely that the rocks of the same age have a common origin. Our geochemical results support the suggestion that before the strong deformation the red SW Swedish gneisses represented rocks of the same type as the TGPB granitoids (GORBATSCHEV, 1971a and b;LARSSON et al, 1986;LINDH, 1987;WAHLGREN, 1988). Although later movements probably have occurred along the Protogine zone (HENKEL & ERIKSSON, 1987), our opinion is that the red SW Swedish gneisses (before the strong deformation) spread out from the maior TGPB root zone.…”

Section: Discussionsupporting

confidence: 85%

“…Therefore it was affected violently by the deformation. Field investigations indicate that most of the present compositional banding is due to very early metamorphic layering (LARSSON et al, 1986). The grey SW Swedish gneisses, the red SW Swedish gneisses, the TGPB and the late Svecofennian granites apparently all have been generated in association with plate tectonic processes west of the Svecofennian domain roughly 1.75-1.8 Ga ago.…”

Section: Syn -Collission Granitoidsmentioning

confidence: 98%

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Geophysical and geochemical evidence of Proterozoic collision in the western marginal zone of the Baltic Shield

Zuber

Öhlander

1990

Geol Rundsch

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ZusammenfassungVor 1,9 Milliarden Jahren kam es zur Neubildung yon konfinentaler Kruste im svecofennischen Bereich des Baltischen Schildes. Ungef~hr 100-150 Millionen Jahre sp~iter wurde im Siidwesten des Schildes neue Kruste hinzugefhgt. In diesem Artikel wird auf der Basis yon Gravimetriemessungen und Lithogeochemie der Versuch unternommen die tektonischen Vorg~inge, die zu diesem 1,75-1,8 Milliarden Jahre alten Krustenzuwachs fiihrten, zu beschreiben.Der Transskandinavische-Granit-Porphyr-Gglrtel (Trans-scandinavian-Granite-Porphyry-Belt/TGPB) trennt das Svecofennium yon der polymetamorphen, im Siidwesten Schwedens gelegenen Gneis-Region. Ein direkt westlich des TGPB gelegenes Vorkommen toter Orthogneise entsprieht den deformierten TGPB Granitoiden. Graue Orthogneise, die weiter im Westen aufgeschlossen sind, zeigen eine mehr tonalitische his granodioritische Zusammensetzung und werden auf einen vulkanischen Inselbogen zuriickgefiihrt. Die TGPB Granitoide und die roren siidwest-scbwedischen Gneise stellen einen Ubergang yon den Inselbogen-Vulkaniten zu den zeitgleichen >,Intra-Platten-Graniten~< der svecofennischen Kruste dar. Der Inselbogen kollidierte mit der svecofennischen Kruste, es entstanden grot~r'~umige Bruchzonen mit Streichrichtungen senkrecht zur Kollisionsebene. W~ihrend des Zustands der hohen Druckspannung des Gebietes intrudierten die ,,Intra-Platten-Granite< Innerhalb des Kollisionsbereiehes wurde die Kruste nach unten gebogen, und so entstanden an der Basis der Kruste grot~e Mengen granitischen Magmas. Dieses TGPB Magma stieg entlang der St6rungs-zone innerhalb der Inselbogengesteine, die nut wenlg ~ilter sind, und der svecofennischen Kruste, auf. Nur ein, yon relativ geringer MSichtigkeit, welter westlich gelegener Tell des TGPB, die roten siidwest-schwedischen Gneise, wurde w~ih-rend der Kollision intensiv deformiert. Dagegen war der Hauptanteil der tiefreichenden TGPB Wurzelzone noch nicht vollst~indig erstarrt und wirkte deshalb wie eine Pufferzone gegen die Schieferungsfront. 0.1-0.15 Ga later, new crust accreted to the SW part of the Shield. In this paper an attempt is made, on the basis of gravity measurements and lithogeochemistry, to describe the tectonic processes responsible for the continental growth c. 1.75-1.8 Ga ago. The Transscandinavian Granite Porphyry Belt (TGPB) separates the Svecofennian domain from the polymetamorphic terrain of the SW Swedish gneiss region. Red orthogneisses occurring immediately west of the TGPB are the deformed equivalents of the TGPB type granitoids, while grey orthogneisses, displaying a tonalitic-granodioritic trend and situated further west, were generated in a *volcanic arc~< environment. The TGPB granitoids and the red SW Swedish gneisses represent a transition from this volcanic arc type rock to contemporaneous ,,within-plate,, type granites intruded in the Svecofennian crust. The volcanic arc was forced against the Svecofennian crust in which large tensional fracture zones ensued with strike directions normal to the collision front. In such ten...

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Section: Discussionsupporting

confidence: 85%

Section: Syn -Collission Granitoidsmentioning

confidence: 98%

Geophysical and geochemical evidence of Proterozoic collision in the western marginal zone of the Baltic Shield

Zuber

Öhlander

1990

Geol Rundsch

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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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“…Larson et al (1986) documented several generations of superposed folds and deformation fabrics in rocks in and along the zone.lundqvist (1979) noted that some Protogine dolerites are strongly deformed and metamorphosed, whereas others show little sign of metamorphism, indicating that dikes were intruded along the zone in at least two different periods. Members of the -15-older set of dikes have experienced two episodes of folding (Lundqvist, 1979).…”

Section: The Protogine Zonementioning

confidence: 99%

Geologic characterization of fractures as an aid to hydrologic modeling of the SCV block at the Stripa mine

Martel¹

1992

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The deformation history of the eastern part of the southwest Swedish gneiss belt

Cited by 69 publications

References 28 publications

Geophysical and geochemical evidence of Proterozoic collision in the western marginal zone of the Baltic Shield

Geophysical and geochemical evidence of Proterozoic collision in the western marginal zone of the Baltic Shield

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

Geologic characterization of fractures as an aid to hydrologic modeling of the SCV block at the Stripa mine

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