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

  • E. Hanski
Conference paper
Part of the Special Publication No. 4 of the Society for Geology Applied to Mineral Deposits book series (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.

Keywords

Geochemistry Fractionation Olivine Pyrite Apatite 

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Copyright information

© Springer-Verlag Berlin Heidelberg 1986

Authors and Affiliations

  • E. Hanski
    • 1
  1. 1.Department of GeologyUniversity of OuluOuluFinland

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