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Chapter 6 Paleoproterozoic (1.9–1.8 Ga) syn-orogenic magmatism, sedimentation and mineralization in the Bergslagen lithotectonic unit, Svecokarelian orogen
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering. (Ore Geology)
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering. Luleå University of Technology. (Ore Geology)ORCID iD: 0000-0002-2634-6953
2020 (English)In: Sweden: Lithotectonic framework, tectonic evolution and mineral resources / [ed] Stephens, M.B., Bergman Weihed, J, London: Geological Society of London, 2020, 1, p. 155-206Chapter in book (Refereed)
Abstract [en]

Felsic volcanic rocks (c. 1.91-1.89 Ga) and interlayered limestone, hosting Zn-Pb-Ag±Cu±Au±Fe sulphide deposits, including three operating mines, as well as Fe oxide deposits, characterize the Bergslagen lithotectonic unit, Svecokarelian orogen, south-central Sweden. Siliciclastic sedimentary rocks stratigraphically envelop this volcanic succession, and all rocks are intruded by a dominant calc-alkaline, c. 1.91-1.87 Ga plutonic suite. Fabric development associated with folding and localized shear deformation followed around 1.87-1.86 Ga (D1) and was succeeded by strongly partitioned strain (D2). Dextral transpression along steeply dipping, WNW-ESE or NW-SE shear zones prevailed in northern and southern domains; major folding with east-northeasterly axial surface traces and shearing along limbs in the central domain. Open folding (D3) subsequently affected western areas. Polyphase metamorphism under low-P and variable-T conditions included anatexis at around 1.86 Ga (M1) and 1.84-1.80 Ga (M2). More alkali-calcic magmatic activity combined with emplacement of anatectic granite and pegmatite overlapped and succeeded the M1 and M2 migmatization events, at c. 1.87-1.83 Ga and c. 1.82-1.75 Ga, respectively. The younger granites are genetically linked in part to W skarn and granite-related Mo sulphide deposits. Switching between retreating and advancing subduction systems during three separate tectonic cycles along a convergent, active continental plate margin is inferred.

Place, publisher, year, edition, pages
London: Geological Society of London, 2020, 1. p. 155-206
Series
Geological Society of London Memoirs ; 50
Keywords [en]
Bergslagen, Fennoscandian shield, Svecokarelian orogen
National Category
Geology
Research subject
Ore Geology
Identifiers
URN: urn:nbn:se:ltu:diva-77174DOI: 10.1144/M50-2017-40ISBN: 1786204606 (print)OAI: oai:DiVA.org:ltu-77174DiVA, id: diva2:1378836
Available from: 2019-12-14 Created: 2019-12-14 Last updated: 2020-01-20

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