Interpreting the Småland-Blekinge Deformation Zone from chemical and structural data

Lindh, Anders; Krauss, M.; Franz, Kai-Michael

doi:10.1080/11035890101233181

Cited by 14 publications

(20 citation statements)

References 11 publications

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“…Stretching and mineral lineations observed within this zone indicate relative uplift of the southern block. Sinistral movements are less well constrained (Krauss et al 1996;Lindh et al 2001). While to the east the SBDZ is covered by the Cambrian sediments, the western extension of the SBDZ is intruded by the Eringsboda pluton and therefore it was active before 1.45 Ga. Further west, the SBDZ and its critical junction with the N-S-trending Protogine Zone is poorly exposed and has not been mapped in detail.…”

Section: Geological Settingmentioning

confidence: 96%

Emplacement and deformation of the ca. 1.45 Ga Karlshamn granitoid pluton, southeastern Sweden, during ENE-WSW Danopolonian shortening

Cecys

Benn

2006

Int J Earth Sci (Geol Rundsch)

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Anisotropy of magnetic susceptibility and structural geology of the ca. 1.45 Ga Karlshamn pluton (southern Sweden) are used to study its emplacement and structural evolution. The Karlshamn pluton is one of the largest metaluminous A-type granitoid intrusions in southern Sweden. It is a multiphase body made up of two suites that differ in composition but which have similar crystallization ages. The magmatic foliation, ductile shear zones and granite-pegmatite filled fractures were mapped as well as the metamorphic foliation and extension lineation in the metamorphic host rocks. The anisotropy of magnetic susceptibility was used to map the magnetite petrofabric of the pluton, providing a larger data set for both the magmatic foliations and lineations, which could not be mapped in the field. The fabrics within the pluton are continuous with the metamorphic fabrics in the country rocks. Both the pluton and the country rock fabrics were folded during ENE-WSW compression, while the pluton was still a magma mush. The stress field orientation during cooling of the pluton is determined on the basis of magmatic, ductile and brittle structures in the Karlshamn pluton that formed successively as the pluton cooled. The compressional event is referred to as the Danopolonian orogeny and therefore the Karlshamn granitoids, and other plutons of similar composition and age in central and southern Sweden, on the Danish Island of Bornholm, and in Lithuania, may be considered as syntectonic intrusions and not as anorogenic, as was previously thought.

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Section: Geological Settingmentioning

confidence: 96%

Emplacement and deformation of the ca. 1.45 Ga Karlshamn granitoid pluton, southeastern Sweden, during ENE-WSW Danopolonian shortening

Cecys

Benn

2006

Int J Earth Sci (Geol Rundsch)

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“…Because of the similarity in age between the Tving granitoids and the TIB-1 Småland granitoids north of the Småland-Blekinge Deformation Zone (SBDF) in southern Småland, the Tving granitoids have sometimes been included within the TIB-1 group, although they have a more mafic and calc-alkaline geochemistry (TIB-1 granitoids are generally alkali-calcic, cf. Kornfält 1999a;Lindh et al 2001;Högdahl et al 2004) and are pervasively deformed. In a more detailed comparison between Tving and Småland granitoids on either side of the SBDF in easternmost Blekinge, Kornfält & Bruun (2002) showed the Tving granitoids to have higher Al 2 O 3 /(Na 2 O+K 2 O) ratios and to be alkali-calcic, whereas the Småland granitoids had an alkalic geochemistry.…”

Section: Regional Geology Of the Blekinge Provincementioning

confidence: 96%

“…1) is separated from the gneisses of the Eastern Segment of the Southwest Scandinavian Domain in the west by the Protogine Zone, and from the Småland granites and porphyries of the Transscandinavian Igneous Belt in the north by the Småland-Blekinge Deformation Zone (SBDF; Krauss et al 1996;Lindh et al 2001). Earlier overviews of the Precambrian of Sweden either have treated the Blekinge Province as a bedrock unit of its own (Lundqvist 1979;Lundqvist & Bygghammar 1994), or depicted it as a Svecofennian outlier (Gaál & Gorbatschev 1987).…”

Section: Introductionmentioning

confidence: 98%

A revised geochronology for the Blekinge Province, southern Sweden

Johansson¹,

Bogdanova

Cecys

2006

GFF

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Zircon grains from nine samples of metavolcanic rocks, gneisses, granitoids and migmatites from the Blekinge Province in southeasternmost Sweden have been dated by U-Pb using ion microprobe. The results suggest that most of the Blekinge bedrock was formed within a narrow time interval of 1.77-1.75 Ga, including the Västanå supracrustal formation and ʻcoastal gneissesʼ previously dated to c. 1.70 Ga. One sample, the 1.81 Ga Nättraby gneissic granite, appears to represent a sliver of slightly older proto-crust. An age of c. 1.75 Ga for an aplitic granite crosscutting the deformed Tving granitoids in eastern Blekinge brackets their deformation to between 1.77 and 1.75 Ga, whereas zircon grains of similar age from a migmatite neosome at Lindö may be inherited, making the result inconclusive. Thin metamorphic zircon overgrowths and resetting of the U-Pb system in titanite indicate a regional tectonothermal event at 1.45 to 1.40 Ga, accompanying the intrusion of the Karlshamn-type granites. The crust of the Blekinge Province thus was formed at 1.77-1.75 Ga from relatively juvenile sources in a subduction-related environment along the southern edge of Fennoscandia. It was deformed and partly uplifted relative to the undeformed TIB-1 granitoids of the Småland block further north, prior to the intrusion of the Karlshamn-type granites at 1.45 Ga.

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“…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

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Interpreting the Småland-Blekinge Deformation Zone from chemical and structural data

Cited by 14 publications

References 11 publications

Emplacement and deformation of the ca. 1.45 Ga Karlshamn granitoid pluton, southeastern Sweden, during ENE-WSW Danopolonian shortening

Emplacement and deformation of the ca. 1.45 Ga Karlshamn granitoid pluton, southeastern Sweden, during ENE-WSW Danopolonian shortening

A revised geochronology for the Blekinge Province, southern Sweden

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

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