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The Aitik Cu-Au-Ag deposit in northern Sweden: a product of high salinity fluids
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.ORCID iD: 0000-0003-4711-7671
Department of Geology Geochemistry, Stockholm University.
2003 (English)In: Mineralium Deposita, ISSN 0026-4598, E-ISSN 1432-1866, Vol. 38, no 6, p. 715-726Article in journal (Refereed) Published
Abstract [en]

The Aitik Cu–Au–Ag deposit is located in northern Sweden and is hosted by strongly deformed 1.9 Ga Svecofennian volcano-sedimentary rocks. The main copper mineralization, which occurs as disseminations and veinlets, is hosted by garnet–biotite schist. Subeconomic mineralization in the footwall to the ore is hosted by feldspar–biotite–amphibole gneiss and porphyritic quartz monzodiorite. The deposit has been affected by post-mineralization metamorphic and igneous activity. Fluid inclusions in six samples of copper-mineralized quartz veins record the presence of three different fluid populations. The main ore was deposited from an aqueous, highly saline (31–37 eq. wt% NaCl + CaCl 2) fluid. This fluid was trapped in inclusions intimately associated with the main chalcopyrite mineralization. Later bornite deposition took place from a less saline (18–27 eq. wt% NaCl + CaCl 2), aqueous fluid. A third fluid composed of almost pure CO 2, interacted with the copper-rich system during a post-ore event. The Aitik Cu–Au–Ag deposit shares some features with both porphyry-type and Fe-oxide–Cu–Au deposits. A high calcium content of the ore fluids, similar to other Cu–Au deposits in northern Scandinavia, suggests a contribution to the salinity of the mainly magmatic-hydrothermal fluids from evaporitic rocks in stratigraphically lower units.

Place, publisher, year, edition, pages
2003. Vol. 38, no 6, p. 715-726
National Category
Geology
Research subject
Ore Geology
Identifiers
URN: urn:nbn:se:ltu:diva-11237DOI: 10.1007/s00126-003-0363-2ISI: 000185140600005Scopus ID: 2-s2.0-0141907705Local ID: a2a09690-ece9-11db-bc0c-000ea68e967bOAI: oai:DiVA.org:ltu-11237DiVA, id: diva2:984186
Note
Validerad; 2003; 20070417 (pafi)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Wanhainen, ChristinaMartinsson, Olof

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