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Zircon U–Pb and Hf – isotopes from the eastern part of the Sveconorwegian Orogen, SW Sweden: implications for the growth of Fennoscandia

By
Andreas Petersson
Andreas Petersson
Department of Geology, Lund University, Sölvegatan 12, SE-223 62 Lund, Sweden
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Anders Scherstén
Anders Scherstén
Department of Geology, Lund University, Sölvegatan 12, SE-223 62 Lund, Sweden
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Jenny Andersson
Jenny Andersson
Geological Survey of Sweden, Box 670, SE-751 28 Uppsala, Sweden
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Charlotte Möller
Charlotte Möller
Department of Geology, Lund University, Sölvegatan 12, SE-223 62 Lund, Sweden
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Published:
January 01, 2015

Abstract

Current models for the growth of Fennoscandia, including the eastern part of the Sveconorwegian Province, are largely based on U–Pb data and do not discriminate between juvenile and reworked crust. Here we present new combined U–Pb and Hf isotopic data, from the Eastern Segment and the Idefjorden terrane of the Sveconorwegian Province, and suggest a revised model of crustal growth. Most of the crystalline basement in this part of the shield formed by mixing of a 2.1–1.9 Ga juvenile component and Archaean crust. Archaean reworking decreases between 1.9 and 1.7 Ga and a mixed Svecofennian crustal reservoir is generated. Succeeding magmatism between 1.7 and 1.4 Ga indicates reworking of this reservoir with little or no crust generation. At c. 1.2 Ga, an influx of juvenile magma is recorded by granite to quartz-syenite magmatism with mildly depleted (ɛHf 1.18 Ga of c. 3) signatures. The amount of recycled crust in the 1.9–1.7 Ga arc system is in contrast to previously proposed models for the growth of the southwestern part of the Fennoscandian Shield. This model agrees with long-term subduction along the western margin of Fennoscandia, but suggests substantial reworking of existing crust and decreasing amounts of <1.9 Ga crustal growth.

Supplementary material:

The analytical method, U–Pb SIMS table, U–Pb LA-SF-ICP-MS table and Lu–Hf table are available at www.geolsoc.org.uk/SUP18648

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Contents

Geological Society, London, Special Publications

Continent Formation Through Time

N. M. W. Roberts
N. M. W. Roberts
NERC Isotope Geosciences Laboratory, UK
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M. Van Kranendonk
M. Van Kranendonk
University of New South Wales, Australia
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S. Parman
S. Parman
Brown University, USA
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S. Shirey
S. Shirey
Carnegie Institution of Washington, USA
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P. D. Clift
P. D. Clift
Louisiana State University, USA
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Geological Society of London
Volume
389
ISBN electronic:
9781862396654
Publication date:
January 01, 2015

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