University of Oulu

Ranta, J., Hanski, E., Stein, H., Goode, M., Mäki, T., Taivalkoski, A. (2020) Kivilompolo Mo mineralization in the Peräpohja belt revisited: Trace element geochemistry and Re-Os dating of molybdenite. Bulletin of the Geological Society of Finland, Vol. 92, 2020, pp 131–150,,

Kivilompolo Mo mineralization in the Peräpohja belt revisited : trace element geochemistry and Re-Os dating of molybdenite

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Author: Ranta, Jukka-Pekka1; Hanski, Eero1; Stein, Holly2,3;
Organizations: 1Oulu Mining School, University of Oulu, P.O.BOX 3000, FI-90014, Finland
2AIRIE Program, Colorado State University, 1482 Campus Mail, Fort Collins, CO 80523-1482, USA
3Institute of Geosciences, University of Oslo, 1047 Blindern, 0316 Oslo, Norway
484 Ballinteer Park, Ballinteer, Dublin 16, D16 HK46, Ireland
5Näsilinnankatu 7 D 48, 33210 Tampere, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 2.5 MB)
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Language: English
Published: The Geological Society of Finland, 2020
Publish Date: 2021-02-17


The Kivilompolo molybdenite occurrence is located in the northern part of the Peräpoh jabelt, within the lithodemic Ylitornio nappe complex. It is hosted within a deformed porphyritic granite belonging to the pre-orogenic 1.99 Ga Kierovaara suite. The mineralization occurs mostly as coarse-grained molybdenite flakes in boudinaged quartz veins, with minor chalcopyrite, pyrite, magnetite, and ilmenite. In this study, we report new geochemical data from the host-rock granite and Re-Os dating results of molybdenite from the mineralization. For the whole-rock geochemistry, the mineralized granite is similar to the Kierovaara suite granites analyzed in previous studies. Also, the ca. 2.0 Ga Re-Os age for molybdenite is equal, within error, to the U-Pb zircon age of the Kierovaara suite granite. In addition, similar molybdenite and uraninite ages have been reported from the Rompas-Rajapalot Au-Co occurrence located 30 km NE of Kivilompolo. We propose that the magmatism at around 2.0 Ga ago initiated the hydrothermal circulation that was responsible for the formation of the molybdenite mineralization at Kivilompolo and the primary uranium mineralization associated with the Rompas-Rajapalot Au-Co occurrence or at least, the magmas provided heating, and in addition potentially saline magmatic fluids and metals from a large, cooling magmatic-hydrothermal system.

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Series: Bulletin of the Geological Society of Finland
ISSN: 0367-5211
ISSN-E: 1799-4632
ISSN-L: 0367-5211
Volume: 92
Issue: 1-2
Pages: 131 - 150
DOI: 10.17741/bgsf/92.2.004
Type of Publication: A1 Journal article – refereed
Field of Science: 1171 Geosciences
Copyright information: © 2020 The Authors. All published content of BGSF is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.