Paleoproterozoic (2.0–1.8 Ga) syn-orogenic sedimentation, magmatism and mineralization in the Bothnia–Skellefteå lithotectonic unit, Svecokarelian orogen
Lithotectonic framework, tectonic evolution and mineral resources.
Document identifier: oai:DiVA.org:ltu-77983
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10.1144/M50-2017-10Keyword: Natural Sciences,
Earth and Related Environmental Sciences,
Geology,
Naturvetenskap,
Geovetenskap och miljövetenskap,
Geologi,
Ore Geology,
MalmgeologiPublication year: 2020Abstract: The Bothnia–Skellefteå lithotectonic unit is dominated by turbiditic wacke and argillite (Bothnian basin), deposited at 1.96 (or older)–1.86 Ga, metamorphosed generally under high-grade conditions and intruded by successive plutonic suites at 1.95–1.93, 1.90–1.88, 1.87–1.85 and 1.81–1.76 Ga. In the northern part, low-grade and low-strain, 1.90–1.86 Ga predominantly magmatic rocks (the Skellefte–Arvidsjaur magmatic province) are enclosed by the basinal components. Subduction-related processes in intra-arc basin and magmatic arc settings, respectively, are inferred. Changes in the metamorphic grade and the relative timing of deformation and structural style across the magmatic province are linked to major shear zones trending roughly north–south and, close to the southern margin, WNW–ESE. Zones trending WNW–ESE and ENE–WSW dominate southwards. Slip along the north–south zones in an extensional setting initiated synchronously with magmatic activity at 1.90–1.88 Ga. Tectonic inversion steered by accretion to a craton to the east, involving crustal shortening, ductile strain and crustal melting, occurred at 1.88–1.85 Ga. Deformation along shear zones under lower-grade conditions continued at c. 1.8 Ga. Felsic volcanic rocks (1.90–1.88 Ga) host exhalative and replacement-type volcanogenic massive sulphide deposits (the metallogenic Skellefte district). Other deposits include orogenic Au, particularly along the ‘gold line’ SW of this district, porphyry Cu–Au–Mo, and magmatic Ni–Cu along the ‘nickel line’ SE of the ‘gold line’.
Authors
Pietari Skyttä
Department of Geography and Geology, University of Turku
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Pär Weihed
Luleå tekniska universitet; Geovetenskap och miljöteknik
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>>
Karin Högdahl
Department of Earth Sciences, Uppsala University. Department of Geology and Mineralogy, Åbo Akademi University
Other publications
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Stefan Bergman
Geological Survey of Sweden
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Michael B. Stephens
Luleå tekniska universitet; Geovetenskap och miljöteknik
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header:
identifier: oai:DiVA.org:ltu-77983
datestamp: 2021-04-19T12:49:03Z
setSpec: SwePub-ltu
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recordContentSource: ltu
recordCreationDate: 2020-03-06
identifier:
http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-77983
10.1144/M50-2017-10
2-s2.0-85087440196
titleInfo:
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lang: eng
title: Paleoproterozoic (2.0–1.8 Ga) syn-orogenic sedimentation magmatism and mineralization in the Bothnia–Skellefteå lithotectonic unit Svecokarelian orogen
abstract: The Bothnia–Skellefteå lithotectonic unit is dominated by turbiditic wacke and argillite (Bothnian basin) deposited at 1.96 (or older)–1.86 Ga metamorphosed generally under high-grade conditions and intruded by successive plutonic suites at 1.95–1.93 1.90–1.88 1.87–1.85 and 1.81–1.76 Ga. In the northern part low-grade and low-strain 1.90–1.86 Ga predominantly magmatic rocks (the Skellefte–Arvidsjaur magmatic province) are enclosed by the basinal components. Subduction-related processes in intra-arc basin and magmatic arc settings respectively are inferred. Changes in the metamorphic grade and the relative timing of deformation and structural style across the magmatic province are linked to major shear zones trending roughly north–south and close to the southern margin WNW–ESE. Zones trending WNW–ESE and ENE–WSW dominate southwards. Slip along the north–south zones in an extensional setting initiated synchronously with magmatic activity at 1.90–1.88 Ga. Tectonic inversion steered by accretion to a craton to the east involving crustal shortening ductile strain and crustal melting occurred at 1.88–1.85 Ga. Deformation along shear zones under lower-grade conditions continued at c. 1.8 Ga. Felsic volcanic rocks (1.90–1.88 Ga) host exhalative and replacement-type volcanogenic massive sulphide deposits (the metallogenic Skellefte district). Other deposits include orogenic Au particularly along the ‘gold line’ SW of this district porphyry Cu–Au–Mo and magmatic Ni–Cu along the ‘nickel line’ SE of the ‘gold line’.
subject:
@attributes:
lang: eng
authority: uka.se
topic:
Natural Sciences
Earth and Related Environmental Sciences
Geology
@attributes:
lang: swe
authority: uka.se
topic:
Naturvetenskap
Geovetenskap och miljövetenskap
Geologi
@attributes:
lang: eng
authority: ltu
topic: Ore Geology
genre: Research subject
@attributes:
lang: swe
authority: ltu
topic: Malmgeologi
genre: Research subject
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languageTerm: eng
genre:
publication/book-chapter
ref
note:
Published
5
ISBN för värdpublikation: 978-1-78620-460-8
name:
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Skyttä
Pietari
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affiliation: Department of Geography and Geology University of Turku
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Weihed
Pär
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Luleå tekniska universitet
Geovetenskap och miljöteknik
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pawe
0000-0003-3879-3897
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Högdahl
Karin
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affiliation: Department of Earth Sciences Uppsala University. Department of Geology and Mineralogy Åbo Akademi University
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Bergman
Stefan
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roleTerm: aut
affiliation: Geological Survey of Sweden
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Stephens
Michael B.
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roleTerm: aut
affiliation:
Luleå tekniska universitet
Geovetenskap och miljöteknik
nameIdentifier: micste
originInfo:
dateIssued: 2020
publisher: Geological Society of London
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titleInfo:
title: Sweden
subTitle: Lithotectonic framework tectonic evolution and mineral resources.
part:
extent:
start: 83
end: 130
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type: series
titleInfo:
title: Memoirs of the geological Society of London
partNumber: 50
identifier: 0435-4052
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