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Chapter 15 Polyphase (1.9–1.8, 1.5–1.4 and 1.0–0.9 Ga) deformation and metamorphism of Proterozoic (1.9–1.2 Ga) continental crust, Eastern Segment, Sveconorwegian orogen

Michael B. Stephens and Carl-Henric Wahlgren
Geological Society, London, Memoirs, 50, 351-396, 10 January 2020, https://doi.org/10.1144/M50-2018-57
Michael B. Stephens
1Division of Geosciences and Environmental Engineering, Luleå University of Technology, SE-971 87 Luleå, Sweden
Roles: [Writing - Original Draft (Equal)]
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Carl-Henric Wahlgren
2Geological Survey of Sweden, Box 670, SE-751 28 Uppsala, Sweden
Roles: [Writing - Original Draft (Equal)]
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Abstract

The Eastern Segment in the Sveconorwegian orogen comprises Paleoproterozoic–Mesoproterozoic magmatic suites, which formed along an active continental margin, and Mesoproterozoic suites emplaced during intracratonic extension. Zn–Pb sulphide and Fe oxide mineralizations in 1.9 Ga metavolcanic rocks form a significant mineral resource cluster in the northeastern part. Deformation and metamorphism under low-pressure (≤5 kbar) and variable-temperature conditions, including anatexis and granulite facies, prevailed during 1.9–1.8 Ga (Svecokarelian) and 1.5–1.4 Ga (Hallandian) accretionary orogenies. Sveconorwegian tectonothermal reworking initiated at c. 0.99–0.98 Ga in structurally lower levels. Crustal shortening, underthrusting with eclogite facies metamorphism (18 kbar), exhumation by eastwards thrusting (D1) during continued shortening and high-pressure granulite (8–12 kbar) to upper amphibolite facies metamorphism prevailed. Anatexis and folding around east–west axial surfaces with west-northwesterly constrictional strain (D2) followed at c. 0.98–0.95 Ga, being consanguineous with crustal extension. Structurally higher levels, northwards and eastwards, consist of high-pressure (10–12 kbar) orthogneisses, not affected by anatexis but also showing polyphase deformation. Sveconorwegian convergence ceased with upright folding along north–south axial surfaces and, in the uppermost frontal part, greenschist facies shearing with top-to-the-foreland normal followed by reverse displacement after 0.95 Ga. The normal shearing detached the upper compartment from the underlying gneisses.

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Geological Society, London, Memoirs: 50 (1)
Geological Society, London, Memoirs
Volume 50
2020
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Chapter 15 Polyphase (1.9–1.8, 1.5–1.4 and 1.0–0.9 Ga) deformation and metamorphism of Proterozoic (1.9–1.2 Ga) continental crust, Eastern Segment, Sveconorwegian orogen

Michael B. Stephens and Carl-Henric Wahlgren
Geological Society, London, Memoirs, 50, 351-396, 10 January 2020, https://doi.org/10.1144/M50-2018-57
Michael B. Stephens
1Division of Geosciences and Environmental Engineering, Luleå University of Technology, SE-971 87 Luleå, Sweden
Roles: [Writing - Original Draft (Equal)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • For correspondence: michael@stephens.se
Carl-Henric Wahlgren
2Geological Survey of Sweden, Box 670, SE-751 28 Uppsala, Sweden
Roles: [Writing - Original Draft (Equal)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site

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Chapter 15 Polyphase (1.9–1.8, 1.5–1.4 and 1.0–0.9 Ga) deformation and metamorphism of Proterozoic (1.9–1.2 Ga) continental crust, Eastern Segment, Sveconorwegian orogen

Michael B. Stephens and Carl-Henric Wahlgren
Geological Society, London, Memoirs, 50, 351-396, 10 January 2020, https://doi.org/10.1144/M50-2018-57
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Chapter 15 Polyphase (1.9–1.8, 1.5–1.4 and 1.0–0.9 Ga) deformation and metamorphism of Proterozoic (1.9–1.2 Ga) continental crust, Eastern Segment, Sveconorwegian orogen
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    • Abstract
    • Character of the boundaries to, and the metamorphism and deformation inside, the Eastern Segment
    • Timing of metamorphism and ductile deformation in different orogenic systems, and later faulting
    • Character and timing of crystallization of protoliths in the pre-Sveconorwegian crust
    • Character and timing of crystallization of syn-orogenic Sveconorwegian rocks
    • Mineral and bedrock resources
    • Discussion and concluding remarks
    • Acknowledgements
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