Chapter 6 Paleoproterozoic (1.9–1.8 Ga) syn-orogenic magmatism, sedimentation and mineralization in the Bergslagen lithotectonic unit, Svecokarelian orogen (original) (raw)

none 10.1144/M50-2017-40 Geological Society of London Geological Society of London 1881 112909331 65092 2024072310103400268 10.1144 2024-07-24T01:28:41Z 2020-01-10T21:09:28Z 23 Geological Society, London, Memoirs Memoirs 0435-4052 2041-4722 02 10 2020 01 2020 50 1 Chapter 6 Paleoproterozoic (1.9–1.8 Ga) syn-orogenic magmatism, sedimentation and mineralization in the Bergslagen lithotectonic unit, Svecokarelian orogen Michael B. Stephens Nils F. Jansson Abstract Felsic volcanic rocks (c. 1.91–1.89 Ga) and interlayered limestone, hosting Zn–Pb–Ag ± Cu ± Au ± Fe sulphide and Fe oxide deposits, characterize the Bergslagen lithotectonic unit, Svecokarelian orogen, south-central Sweden. Three sulphide mines are currently in operation. Siliciclastic sedimentary rocks stratigraphically envelop this volcanic succession and all the 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 atc. 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 the northern and southern domains, whereas major folding with east to northeasterly axial surface traces and shearing along limbs occurred in the central domain. Open folding (D3 ) subsequently affected the western areas. Polyphase metamorphism under low-pressure and variable temperature conditions included anatexis atc. 1.86 Ga (M1 ) and 1.84–1.80 Ga (M2 ). More alkali–calcic magmatic activity, combined with the emplacement of anatectic granite and pegmatite, overlapped and succeeded the M1 and M2 migmatization events atc. 1.87–1.83 Ga andc. 1.82–1.75 Ga, respectively. The younger granites are genetically linked in part to W skarn deposits and host Mo sulphide mineralization. Switching between retreating and advancing subduction systems during three separate tectonic cycles along a convergent, active continental plate margin is inferred. 01 10 2020 01 2020 155 206 10.1144/M50-2017-40 1 10.1144/crossmark-policy www.lyellcollection.org true 2020-01-10 https://doi.org/10.15223/policy-002 10.1144/M50-2017-40 https://www.lyellcollection.org/doi/10.1144/M50-2017-40 https://www.lyellcollection.org/doi/pdf/10.1144/M50-2017-40 https://pubs.geoscienceworld.org/UrlRedirectHandler.ashx?routename=books&chapterdoi=10.1144/M50-2017-40&request=chapter 10.1080/11035898509454636 10.1080/11035898309452583 10.1016/S0040-1951(96)00213-2 Sveriges geologiska undersökning Rapporter och meddelanden Ahl M. 106 2001 Geochemical Classification of the Plutonic Rocks in Central and Northern Sweden AhlM., BergmanS., BergströmU., EliassonT., RipaM. & WeihedP. 2001. Geochemical Classification of the Plutonic Rocks in Central and Northern Sweden. 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