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Reworking of older (1.8 Ga) continental crust by Mesoproterozoic (1.5–1.4 Ga) orogeny, Blekinge–Bornholm orogen, southeastern Sweden
Geological Survey of Sweden, Box 670, SE-751 28 Uppsala, Sweden.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.
2020 (English)In: Sweden: Lithotectonic Framework, Tectonic Evolution and Mineral Resources / [ed] M. B. Stephens and J. Bergman Weihed, Geological Society of London, 2020, p. 291-312Chapter in book (Other academic)
Abstract [en]

The Blekinge–Bornholm orogen in southeastern Sweden consists of calc-alkaline to alkali–calcic intrusive rocks, rhyolites and dacites (1.8 Ga) that were structurally reworked under amphibolite facies conditions, affected by migmatization at mid-crustal levels at c. 1.44 Ga and intruded at c. 1.47–1.43 Ga by ferroan alkali–calcic plutons. This Mesoproterozoic orogen is bordered westwards by the Sveconorwegian orogen and northwards, along the boundary with well-preserved 1.8 Ga magmatic rocks in the Svecokarelian orogen, by a stitching c. 1.45 Ga pluton and steeply dipping ductile zones with a south-side-up, dip-slip shear component. A variably developed gneissic fabric (S1) dips gently to moderately northwards and is affected by asymmetrical F2 folds with a southerly vergence. Ductile high-strain zones with top-to-the south shear sense are suggested to correspond at depth to anomalously reflective zones along seismic profile BABEL line A. Open folding of the gneissosity around gently, north-plunging fold axes (F3) completed the ductile deformational evolution. Uncertainty remains about the timing of the amphibolite facies ductile fabric and the D2 folding, which is either late-stage Svecokarelian (c. 1.77–1.75 Ga) or Hallandian (c. 1.47–1.43 Ga). Non-collisional, accretionary orogenic systems are suggested to have operated during both time periods, radical reorganization of the subduction trend accompanying the Mesoproterozoic event.

Place, publisher, year, edition, pages
Geological Society of London, 2020. p. 291-312
Series
Memoirs of the Geological Society of London, ISSN 0435-4052, E-ISSN 2041-4722 ; 50
National Category
Geology
Research subject
Ore Geology
Identifiers
URN: urn:nbn:se:ltu:diva-78276DOI: 10.1144/M50-2017-1Scopus ID: 2-s2.0-85087454263OAI: oai:DiVA.org:ltu-78276DiVA, id: diva2:1420945
Note

ISBN för värdpublikation: 978-1-78620-460-8

Available from: 2020-04-01 Created: 2020-04-01 Last updated: 2020-07-15Bibliographically approved

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Stephens, Michael B.

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