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The Gabbro-Wehrlite Association in the Eastern Part of the Baltic Shield

  • Conference paper
Geology and Metallogeny of Copper Deposits

Part of the book series: Special Publication No. 4 of the Society for Geology Applied to Mineral Deposits ((MINERAL DEPOS.,volume 4))

Abstract

Proterozoic mafic and ultramafic intrusive rocks are widespread in the Archaean Kuhmo greenstone belt, including three minor Ni—Cu deposits. Similar intrusions have also been found in the Koli area cutting Jatulian metasediments and the underlying granitoid basement. They are incorporated in the same magmatic association “the gabbro-wehrlite association” as the Ni-bearing intrusions of Pechenga. The cumulate sequences in the layered bodies include olivine, olivine-clinopyroxene, clinopyroxene, clinopyroxene-magnetite, and plagioclase-clinopyroxene-magnetite cumulates. Ti-rich amphibole and mica occur abundantly as postcumulus phases in ultramafic rocks. The chemical compositions of the minerals and rocks differ from those of the Pechenga intrusions, reflecting differences in the parent magmas and their fractionation stages. The parent magmas in eastern Finland and Pechenga are similar to picrites of the Suisaarian and Pechenga types, respectively.

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Author notes

  1. E. Hanski

    Present address: Geological Survey of Finland, PL 77, 96101, Rovaniemi, Finland

Authors and Affiliations

  1. Department of Geology, University of Oulu, Oulu, Finland

    E. Hanski

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  1. E. Hanski
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Editors and Affiliations

  1. Institut für Mineralogie und Lagerstättenlehre, RWTH Aachen, Wüllnerstraße 2, 5100, Aachen, Germany

    Günther H. Friedrich

  2. CCCP/IGEM, Staromonetny, 35, 109017, Moscow, USSR

    Alexandr D. Genkin

  3. Department of Geology, University of Toronto, M5S 1A1, Toronto, Ontario, Canada

    Anthony J. Naldrett

  4. 1402 NW 18th Street, 32605, Gainesville, FL, USA

    John D. Ridge

  5. 8 West Hill Park, N6 6ND, Highgate Village London, England

    Richard H. Sillitoe

  6. Geologisk Institut Norges Tekniske Høgskole, Universitetet i Trondheim, 7034, Trondheim, Norway

    Frank M. Vokes

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© 1986 Springer-Verlag Berlin Heidelberg

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Hanski, E. (1986). The Gabbro-Wehrlite Association in the Eastern Part of the Baltic Shield. In: Friedrich, G.H., Genkin, A.D., Naldrett, A.J., Ridge, J.D., Sillitoe, R.H., Vokes, F.M. (eds) Geology and Metallogeny of Copper Deposits. Special Publication No. 4 of the Society for Geology Applied to Mineral Deposits, vol 4. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-70902-9_10

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  • DOI: https://doi.org/10.1007/978-3-642-70902-9_10

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-642-70904-3

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