Deformational, metamorphic and geochronological constraints from the Loftahammar‐Linköping Deformational Zone (LLDZ) in SE Sweden: Implications for the development of the Svecofennian Orogen

Beunk, F.F.; Page, Laurence; Wijbrans, J.R.; Barling, Jane

doi:10.1080/11035899609546269

Cited by 18 publications

(4 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…1.80 Ga TIB 1 rocks on both sides of the OJB (e.g. Beunk et al 1996;Lindh et al 2001). clr = clear, elong = elongate, frags = fragments, lg = large (+100 µm), med = medium (75-100 µm), sm = small (50-75 µm), sub = subhedral, vsm = very small (<50 µm).…”

Section: Eksjö Tonalitementioning

confidence: 99%

Transitioning from Svecofennian to Transcandinavian Igneous Belt (TIB) magmatism in SE Sweden: Implications from the 1.82 Ga Eksjö tonalite

Åhäll¹,

Connelly

Brewer

2002

GFF

View full text Add to dashboard Cite

Section: Eksjö Tonalitementioning

confidence: 99%

Transitioning from Svecofennian to Transcandinavian Igneous Belt (TIB) magmatism in SE Sweden: Implications from the 1.82 Ga Eksjö tonalite

Åhäll¹,

Connelly

Brewer

2002

GFF

View full text Add to dashboard Cite

“…1), possibly at middle and upper crustal levels within the Bothnian Basin, and probably at lower to middle crustal levels in the boundary area between the Bergslagen province and the Ljusdal Domain (Korja & Heikkinen 2005Högdahl et al 2009). In general, field evidence for thrust tectonics in the Svecofennian is still sparse and it has been interpreted that crustal shortening was mainly accommodated by thickening rather than thrusting, at least in the Svecofennian of southern Finland (Cagnard et al 2007). The existence of major shallow-dipping shear zones that can be followed more or less continuously in the eastern part of the Ljusdal Domain (Fig.…”

Section: Articlementioning

confidence: 99%

“…Both within and to the south and northwest of the Ljusdal Domain there are a number of post-accretionary 1.82 -1.80 Ga, NW -SE to NNW -SSE ductile shear zones (Bergman & Sjöström 1994;Talbot & Sokoutis 1995;Beunk et al 1996;Stephens & Wahlgren 1996;Sjöström & Bergman 1998;Högdahl 2000;Persson & Sjöström 2003). The majority of these shear zones are dextral with shallow-plunging stretching lineations indicating mainly strike-slip to slightly oblique displacement.…”

Section: The Ljusdal Domainmentioning

confidence: 99%

Deep drilling in a Palaeoproterozoic hot orogen – potential for deciphering the orogenic accretion and physical properties of a tectonically layered crust

Högdahl

Sjöström

2010

GFF

View full text Add to dashboard Cite

The Svecofennian is a large hot orogen composed of different accreted crustal units. The boundaries between these units are often characterised by major, steeply dipping shear zones with post-accretionary signatures. However, some of these shear zones have recorded an earlier and long-lived activity related to the accretionary episode, so have moderately eastward dipping shear zones identified in the eastern part of the Ljusdal Domain in the central part of the orogen. These shear zones, repeated at multiple lithostratigraphical levels, are associated with west verging asymmetric F 2 -folds indicating thrusting with imbricate slices in thickness comparable to those in the Caledonides. In the Ljusdal Domain these structures have been recognised in rock of significantly different metamorphic grade indicating thick-skin thrusting on the crustal scale possibly accompanied by channel flow. Information from deep drilling through these stacked units would shed light on the tectonostratigraphy and consequently the accretionary to post-accretionary evolution of hot orogens. In addition, information about groundwater circulation, geothermal energy potential and reservoir quality of tectonically layered rocks for e.g. CO 2 sequestration experiments in crystalline rocks would be gained.

show abstract

“…Several older WNW-ESE, N W -S E and NNW-SSE trending shear zones occur to the east of the SFDZ. Early activity along some of these zones has been interpreted to have occurred at c. 1.80Ga (Bergman & Sj6str6m 1994;H6gdahl et al 1996;Beunk et al 1996). Most of these shear zones contain evidence of reactivation.…”

Section: Regional Geologymentioning

confidence: 99%

Structure and geophysics of the Gåsborn granite, central Sweden: an example of fracture-fed asymmetric pluton emplacement

Cruden

Sjöström

Aaro

1999

View full text Add to dashboard Cite

The emplacement mechanisms of the Palaeoproterozoic Gfisborn granite, a satellite of the Transscandinavian Igneous Belt (TIB), are !nvestigated using an integrated structural and geophysical approach. The pluton is discordant to c. 1.89 Ga folded supracrustal rocks that were deformed and metamorphosed at c. 1.85-1.80 Ga during the Svecokarelian Orogeny. Emplacement occurred at a depth of c. 10 km, within a regime of late Svecokarelian dextral transpression. Deformation of the pluton during cooling resulted in the formation of a variably developed foliation in the granite and deflection of less competent wall-rock units around its western and eastern contacts. Later E-W Sveconorwegian shortening resulted in the formation of shear zones that affect one of the pluton margins and may contribute to a component of the observed wall-rock distortion. The granite is situated above strong NNW-trending linear magnetic and negative gravity anomalies, which are interpreted to correspond to an important early Svecokarelian shear zone. The geophysical data indicate that the pluton is markedly asymmetric and modelling of the residual gravity field suggests that it consists of a deep root zone in the west and a thin sill-like body, which makes up most of the east and south parts of the body. Emplacement of the sill-like part occurred by lateral flow of magma from the root zone accommodated by downwarping of the underlying units. Intrusion of the thicker, discordant west part may have been accommodated by a combination of roof lifting and floor depression, aided by displacement on an active shear zone.

show abstract

Deformational, metamorphic and geochronological constraints from the Loftahammar‐Linköping Deformational Zone (LLDZ) in SE Sweden: Implications for the development of the Svecofennian Orogen

Cited by 18 publications

References 4 publications

Transitioning from Svecofennian to Transcandinavian Igneous Belt (TIB) magmatism in SE Sweden: Implications from the 1.82 Ga Eksjö tonalite

Transitioning from Svecofennian to Transcandinavian Igneous Belt (TIB) magmatism in SE Sweden: Implications from the 1.82 Ga Eksjö tonalite

Deep drilling in a Palaeoproterozoic hot orogen – potential for deciphering the orogenic accretion and physical properties of a tectonically layered crust

Structure and geophysics of the Gåsborn granite, central Sweden: an example of fracture-fed asymmetric pluton emplacement

Contact Info

Product

Resources

About