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Vaikijaur Cu-Au-(Mo) deposit, northern Sweden: preliminary results from fluid inclusion and (O, H) isotope studies
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.
Stockholms Universitet.
Scottish Universities Environmental Research Centre.
2006 (English)In: The 27th Nordic Geological Winter Meeting, January 9-12, 2006, Oulu, Finland: abstract volume / [ed] Petri Peltonen ; Antti Pasanen, Helsinki: Geological Society of Finland , 2006, 95- p.Conference paper, Meeting abstract (Other academic)
Abstract [en]

The Vaikijaur Cu-Au-(Mo) deposit is located in the ca. 1.88 Ga calc-alkaline Jokkmokk granitoid near the Archaean-Proterozoic palaeoboundary within the Fennoscandian shield in northern Sweden. The Vaikijaur deposit occupies an area of 2×3 km within the Jokkmokk granitoid and includes stockwork quartz-sulphide veinlets and disseminated sulphides and gold. The mineralized area is characterized by potassic, phyllic and propylitic alteration. A conductive pyrite-rich central part is surrounded by a conductive and magnetic zone with pyrite, chalcopyrite, and gold. Analyses of one metre drill core sections have shown up to 5% Cu and 7 ppm Au. Molybdenite is distributed irregularly in the deposit. Re-Os age data suggest that primary porphyry-style mineralization was associated with the calc-alkaline magmatism at ca. 1.89-1.87 Ga. Molybdenite records also a later metamorphic event at about 1750 Ma (Lundmark et al., 2005).Preliminary fluid inclusion data reveal no evidence for the involvement of high-salinity fluids typically for the Norrbotten Fe oxide-Cu-Au ores. By contrast, fluid inclusions in quartz veinlets associated with the sulphides at Vaikijaur indicate deposition from inflowing low- to medium-salinity aqueous and carbon dioxide-rich fluids. Oxygen and hydrogen isotope compositions of quartz, biotite, chlorite and amphibole in ore-related samples have mixed magmatic and seawater signatures.

Place, publisher, year, edition, pages
Helsinki: Geological Society of Finland , 2006. 95- p.
Series
Bulletin of the Geological society of Finland, ISSN 0367-5211 ; Special issue 1
National Category
Geology
Research subject
Ore Geology
Identifiers
URN: urn:nbn:se:ltu:diva-34493Local ID: 8b55caa0-ee88-11db-bb5c-000ea68e967bOAI: oai:DiVA.org:ltu-34493DiVA: diva2:1007744
Conference
Nordic Geological Winter Meeting : 09/01/2006 - 12/01/2006
Note
Godkänd; 2006; 20111007 (andbra)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved

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