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Paleoproterozoic (1.9–1.8 Ga) syn-orogenic magmatism, sedimentation and mineralization in the Bergslagen lithotectonic unit, Svecokarelian orogen
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geovetenskap och miljöteknik. (Ore Geology)
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geovetenskap och miljöteknik. Luleå University of Technology. (Ore Geology)ORCID-id: 0000-0002-2634-6953
2020 (Engelska)Ingår i: Sweden: Lithotectonic framework, tectonic evolution and mineral resources / [ed] Stephens, M.B., Bergman Weihed, J, London: Geological Society of London, 2020, 1, s. 155-206Kapitel i bok, del av antologi (Refereegranskat)
Abstract [en]

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 at c. 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 at c. 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 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 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.

Ort, förlag, år, upplaga, sidor
London: Geological Society of London, 2020, 1. s. 155-206
Serie
Memoirs of the Geological Society of London, ISSN 0435-4052 ; 50
Nyckelord [en]
Bergslagen, Fennoscandian shield, Svecokarelian orogen
Nationell ämneskategori
Geologi
Forskningsämne
Malmgeologi
Identifikatorer
URN: urn:nbn:se:ltu:diva-77174DOI: 10.1144/M50-2017-40ISBN: 978-1-78620-460-8 (tryckt)OAI: oai:DiVA.org:ltu-77174DiVA, id: diva2:1378836
Tillgänglig från: 2019-12-14 Skapad: 2019-12-14 Senast uppdaterad: 2020-02-04Bibliografiskt granskad

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Stephens, MichaelJansson, Nils

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