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Anders Scherstén

Anders Scherstén

Universitetslektor

Anders Scherstén

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

Författare

  • Andreas Petersson
  • Anders Scherstén
  • Jenny Andersson
  • Charlotte Möller

Summary, in English

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 (εHf 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.

Avdelning/ar

  • Berggrundsgeologi

Publiceringsår

2015-05-24

Språk

Engelska

Sidor

281-303

Publikation/Tidskrift/Serie

Geological Society Special Publication

Volym

389

Issue

1

Dokumenttyp

Artikel i tidskrift

Förlag

Geological Society of London

Ämne

  • Geology

Aktiv

Published

ISBN/ISSN/Övrigt

  • ISSN: 0305-8719