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Emplacement and deformation of the ca. 1.45 Ga Karlshamn granitoid pluton, southeastern Sweden, during ENE-WSW Danopolonian shortening

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Abstract

Anisotropy of magnetic susceptibility and structural geology of the ca. 1.45 Ga Karlshamn pluton (southern Sweden) are used to study its emplacement and structural evolution. The Karlshamn pluton is one of the largest metaluminous A-type granitoid intrusions in southern Sweden. It is a multiphase body made up of two suites that differ in composition but which have similar crystallization ages. The magmatic foliation, ductile shear zones and granite–pegmatite filled fractures were mapped as well as the metamorphic foliation and extension lineation in the metamorphic host rocks. The anisotropy of magnetic susceptibility was used to map the magnetite petrofabric of the pluton, providing a larger data set for both the magmatic foliations and lineations, which could not be mapped in the field. The fabrics within the pluton are continuous with the metamorphic fabrics in the country rocks. Both the pluton and the country rock fabrics were folded during ENE–WSW compression, while the pluton was still a magma mush. The stress field orientation during cooling of the pluton is determined on the basis of magmatic, ductile and brittle structures in the Karlshamn pluton that formed successively as the pluton cooled. The compressional event is referred to as the Danopolonian orogeny and therefore the Karlshamn granitoids, and other plutons of similar composition and age in central and southern Sweden, on the Danish Island of Bornholm, and in Lithuania, may be considered as syntectonic intrusions and not as anorogenic, as was previously thought.

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Acknowledgments

Audrius Čečys thanks Göran Bylund to introduction to the AMS method. Charlotta Janson is acknowledged for helping to measure AMS. Andrius Rimša and Olga Čečienė assisted during the fieldwork. Dr. Czeck and Dr. Bouchez are acknowledged for reviewing the manuscript and providing valuable comments. The work has been supported by the Swedish Research Council to S. Bogdanova, Grant No. G650-199815132000.

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  1. Department of Bedrock Geology, Geobiosphere Centre, Lund University, Sölvegatan 12, SE-22362, Lund, Sweden

    Audrius Čečys

  2. Ottawa-Carleton Geoscience Centre and Department of Earth Sciences, University of Ottawa, 140 Louis-Pasteur Street, Ottawa, ON, K1N6N5, Canada

    Keith Benn

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Čečys, A., Benn, K. Emplacement and deformation of the ca. 1.45 Ga Karlshamn granitoid pluton, southeastern Sweden, during ENE-WSW Danopolonian shortening. Int J Earth Sci (Geol Rundsch) 96, 397–414 (2007). https://doi.org/10.1007/s00531-006-0114-6

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