Nature of a major tectonic discontinuity in the Svecofennian province of northern Sweden

Rutland, R. W. R.; Kero, L.; Nilsson, G.; Stølen, Lars Kristian

doi:10.1016/s0301-9268(01)00165-6

Cited by 52 publications

(33 citation statements)

References 29 publications

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“…Subduction zones may have been involved in the accretion process and pre-1.91 Ga sutures and/or major D E thrust structures may therefore be present. Rutland et al, (2001a) suggested that the earliest deformation phase (D E1 ) could perhaps be directly responsible for the deep seismic reflectors, interpreted as a fossil subduction zone, in BABEL profiles 3 and 4 (BABEL Working Group, 1990;. The NE dip of this zone is consistent with the direction of D E1 thrusting onto the adjacent Karelian craton.…”

Section: 2the Early Svecofennian Deformationmentioning

confidence: 96%

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Pre-1.91 Ga deformation and metamorphism in the Palaeoproterozoic Vammala Migmatite Belt, southern Finland, and implications for Svecofennian tectonics

Rutland¹,

Williams²,

Korsman³

2004

Bull Geol Soc Finland

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A metamorphic event in the Vammala Migmatite Belt (VMB) at ~1.92 Ga, revealed by SHRIMP U-Pb analyses of both zircon overgrowths and monazite,is interpreted as post-depositional and is correlated with the development of the early high-grade schistosity.Neither this Early Svecofennian deformation and metamorphism, nor the associated complex folding, is present in the overlying Ta mpere Schist Belt (TSB) sequence, consistent with the VMB being part of a pre-1.91 Ga basement complex. The ~1.92 Ga event provides a maximum deposition age for the TSB,confirming earlier age estimates. Earlier stratigraphic correlations between parts of the VMB and TSB,and associated tectonic interpretations, can no longer be sustained.The crustal thickening seen in the VMB,and previously attributed to arc accretion at ~1.89 Ga, is now attributed to accretion of a large Svionian marginal basin during the 'Early Svecofennian' orogenic phase at ~1.92 Ga.This is of similar age to the deformation and metamorphism associated with collision in the Lapland-Kola Orogen to the north of the Karelian Province. The well-known post-TSB orogenic phase was also identified in the VMB by a monazite age of 1881±6 Ma. A granitoid intrusion gave an emplacement age of 1888±5 Ma, comparable to the age of granitoid clasts in the upper part of the TSB succession.The detrital zircon data are interpreted to suggest that deposition of the precursor VMB sediments probably took place soon after an earlier pre-depositional metamorphism at ~1.98 Ga, which affected igneous source complexes dated at ~1.99 Ga and ~2.01 Ga. Mafic rocks in the southern part of the VMB,and probably also the Haveri basalts, represent a renewed episode of extensional magmatism, which might correlate with the 1.96-1.95 Ga Jormua and Outokumpu ophiolites. A pre-1.96 Ga older stage basin has an expression in Sweden and complexes of similar age occur in the concealed Palaeoproterozoic basement south of the Gulf of Finland. Similar rocks, deformed and metamorphosed before ~1.96 Ga, might be present beneath the Central Finland granitoid complex and the late Svecofennian granite-migmatite zone,and were possibly more local sources for both the younger stage Svionian basin sediments and the post-1.91 Ga Bothnian Basin sediments.The TSB and other post-accretionary volcanic sequences, and the associated plutonism, are interpreted to reflect a ~40 m.y.extensional period, inboard of the contemporaneous active margin, between orogenic phases at ~1.92 Ga and ~1.88 Ga.This interpretation provides a more satisfactory explanation of the major heat input to the crust over a very wide area than does the arc accretion hypothesis.The tectonic evolution of the Svecofennian Province has strong similarities to that of the Palaeozoic Lachlan Fold Belt in eastern Australia.

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Section: 2the Early Svecofennian Deformationmentioning

confidence: 96%

“…2). Rutland et al (2001a and2001b) argued that the early (D 1 ) deformation and metamorphism in the Robertsfors Group took place before deposition of the Skele lefte sequence (i.e. before ~1.9 Ga).…”

Section: Introductionmentioning

confidence: 99%

Pre-1.91 Ga deformation and metamorphism in the Palaeoproterozoic Vammala Migmatite Belt, southern Finland, and implications for Svecofennian tectonics

Rutland¹,

Williams²,

Korsman³

2004

Bull Geol Soc Finland

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“…The surface trace of the Burträsk end-glacial fault cuts mainly across high-grade meta-greywackes and metaargillites of the Robertsfors Group Rutland et al, 2001). These rocks are on the order of 1.96-1.88 Ga (Kathol and Weihed, 2005), although there is some debate about their age (e.g., Weihed, 2003;Skiöld and Rutland, 2009;Högdahl and Lundqvist, 2009), as well as the tectonic evolution of the area (see Lahtinen et al, 2009).…”

Section: Geological Settingmentioning

confidence: 99%

“…2) by Romer and Nisca (1996). Rutland et al (2001) subdivided the Burträsk Shear Zone into the Bursiljum sub-zone and the discrete Bygdeträsk Shear Zone. The latter of these correlates with the occurrence of some larger nickel deposits northeast of the seismic profile (Fig.…”

Section: Geological Settingmentioning

confidence: 99%

Reflection seismic studies over the end-glacial Burträsk fault, Skellefteå, Sweden

Juhlin

Lund

2011

Solid Earth

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Abstract. Reflection seismic data were acquired along a ca. 22 km long profile over the end-glacial Burträsk fault with a nominal receiver and source spacing of 20 m. A steeply dipping reflection can be correlated to the Burträsk fault, indicating that the fault dips at about 55 • to the southeast near the surface. The reflection from the fault is rather poorly imaged, probably due to a lateral offset in the fault of about 1 km at this location and the crookedness of the seismic profile in the vicinity of the fault. A more pronounced steeply dipping reflection is observed about 4 km southeast of the Burträsk fault. Based on its correlation with a topographic low at the surface this reflection is interpreted to originate from a fracture zone. There are no signs of large displacements along this zone as the glacial ice receded, but earthquakes could be associated with it today. Other reflections on the processed seismic section may originate from changes in lithological variations in the supra-crustal rocks or from intrusions of more mafic rock. Constraints on the fault geometry provided by the reflection seismic data will help determine what stresses were required to activate the fault when the major rupture along it occurred ca. 9500 years ago.

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“…Figura 2.1 -Localização da Província Borborema e da área de estudo no contexto geotectônico da Plataforma Sul-Americana (modificado de Almeida et al 1977, Brito Neves et al 2000, CPRM 2001 Gravimétrico do Nordeste Setentrional do Brasil e da espessura da crosta continental (28km) obtida por Matos (1992a), com base em interpretações de seções sísmicas de reflexão profunda (Castro et al 1997b) (Castro et al 1998, Blum 1999, Campelo 1999, Rutland et al 2001, Oliveira et al 2005b, Holm et al 2007). …”

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Contribuição Geofísica À Análise Do Arcabouço Tectônico Do Domínio Rio Grande Do Norte, Província Borborema – Ne Brasil

Gonçalves

Dantas

Silva

et al. 2007

10th International Congress of the Brazilian Geophysical Society &Amp; EXPOGEF 2007, Rio De Janeiro, Brazil, 19-23 November 200

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Nature of a major tectonic discontinuity in the Svecofennian province of northern Sweden

Cited by 52 publications

References 29 publications

Pre-1.91 Ga deformation and metamorphism in the Palaeoproterozoic Vammala Migmatite Belt, southern Finland, and implications for Svecofennian tectonics

Pre-1.91 Ga deformation and metamorphism in the Palaeoproterozoic Vammala Migmatite Belt, southern Finland, and implications for Svecofennian tectonics

Reflection seismic studies over the end-glacial Burträsk fault, Skellefteå, Sweden

Contribuição Geofísica À Análise Do Arcabouço Tectônico Do Domínio Rio Grande Do Norte, Província Borborema – Ne Brasil

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