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Geochemical Constraints on the Evolution of the Proterozoic Continental Crust in Southern Norway (Telemark Sector)

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The Deep Proterozoic Crust in the North Atlantic Provinces

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

Abstract

The Proterozoic continental crust of the Telemark sector consists of supracrustal gneisses and several later plutonic suites intruded between 1.6 and 1.25 Ga ago. In chronological order, these are: metabasites and tonalites; granites; and charnockite-alkaline complexes. The metabasites and tonalites are calcic to calc-alkaline with MORB-like HFSE (P, Zr, Ti, HREE, Y) abundances, but they are enriched in LILE and deficient in Ta and Nb relative to other incompatible elements. The later plutonic rocks become progressively more alkaline, have higher Fe/Mg ratios, and are highly enriched in LILE and HFSE; Nb-deficiencies are less pronounced, but are accompanied by relative deficiencies in Sr, P and Ti.

The chemical evolution is similar to that observed in modern cordilleran orogens, in the transition from island and primitive continental arcs to mature continental and back arc-anorogenic environments, and is interpreted in terms of variation in sub-crustal source composition.

The earliest rocks were derived from previously depleted mantle which had experienced subduction-related enrichment in LILE via hydrous fluids originating in the subducted slab at the time of, or shortly before, magma generation. The later rocks have an increasing component derived from a within-plate mantle type, which had been modified by the introduction of non-subduction-related C02 — rich LILE- and HFSE- bearing fluids or partial melts.

These geochemical signatures developed during accretion of the Proterozoic south Norwegian crust above a W-migrating, E-dipping subduction zone.

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Authors and Affiliations

  1. Institute for Energy Technology, P.O. Box 40, 2007, Kjeller, Norway

    P. C. Smalley

  2. Geology Dept., The University, Nottingham, NG7 2RD, UK

    D. Field

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  1. P. C. Smalley
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  2. D. Field
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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

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Smalley, P.C., Field, D. (1985). Geochemical Constraints on the Evolution of the Proterozoic Continental Crust in Southern Norway (Telemark Sector). 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_31

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  • DOI: https://doi.org/10.1007/978-94-009-5450-2_31

  • Publisher Name: Springer, Dordrecht

  • Print ISBN: 978-94-010-8907-4

  • Online ISBN: 978-94-009-5450-2

  • eBook Packages: Springer Book Archive

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