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The Deep Proterozoic Crust in the North Atlantic Provinces pp 259–290Cite as

The Evolution of the South Norwegian Proterozoic as Revealed by the Major and Mega-Tectonics of the Kongsberg and Bamble Sectors

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Part of the book series: NATO ASI Series ((ASIC,volume 158))

Abstract

Detailed surveys of the Kongsberg and Bamble Sectors have shown that both underwent early, major folding, with amphibolite-granulite facies metamorphism (probably associated with C02 flushing and possible mantle degassing) during the Kongsbergian Orogeny (~1600–1500 Ma). A series of ductile shearing episodes mylonitised rocks, particularly at the junctions with the Telemark block, until folding of regional extent occurred again during the second phase of the Sveconorwegian Orogeny(~1100–1000 Ma) which reached greenschist to amphibolite facies grade. The sequence of tectonic events is punctuated by intrusive and metamorphic episodes which can be dated relatively and absolutely. The Kongsberg-Bamble belt probably formed by deposition in a marginal basin of the Svecofennian craton and the Proterozoic Supercontinent. Early shelf deposits were followed by deeper water sediments with intermediate and basic volcanics. Some overlap into the Telemark block is preserved, in places. The major and mega structures suggest a more stable, thicker Telemark block surrounded by a Kongsberg-Bamble mobile belt which has an early antiformal axis still recognisable in the oldest metasediments. The different structural styles and ductile shear directions explain the apparently anomalous NE-SW orientation of the Bamble Sector and the preservation of remnant Kongsbergian ages in certain domains. The more intensive Sveconorwegian deformation and metamorphism in the Telemark Sector is also explained.

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Authors and Affiliations

  1. Department of Geology, University College London, Gower Street, London, WC1E 6BT, UK

    I. C. Starmer

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  1. I. C. Starmer
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Editors and Affiliations

  1. Earth Science Institute, State University, Utrecht, The Netherlands

    Alex C. Tobi

  2. Earth Science Institute, The Free University, Amsterdam, The Netherlands

    Jacques L. R. Touret

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© 1985 D. Reidel Publishing Company, Dordrecht, Holland

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Starmer, I.C. (1985). The Evolution of the South Norwegian Proterozoic as Revealed by the Major and Mega-Tectonics of the Kongsberg and Bamble Sectors. In: Tobi, A.C., Touret, J.L.R. (eds) The Deep Proterozoic Crust in the North Atlantic Provinces. NATO ASI Series, vol 158. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-5450-2_16

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  • DOI: https://doi.org/10.1007/978-94-009-5450-2_16

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