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Structural controls on the shear zone hosted, IOCG-style Kiskamavaara Cu-Co-Au mineralization
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering.
2019 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Sweden is the largest producer of iron ore in the European Union, as well as amongst the top producers for base and precious metals. Much of its mineral wealth derives from northern Norrbotten, type locality of the Kiruna-type-magnetite-apatite ores. Besides the massive iron ore bodies, the region is further recognized as important iron-oxide-copper-gold (IOCG) province, with the world class, Aitik Cu-Au-Ag-(Mo) deposit as its most prominent example (1061 Mt with 0,22% Cu; 0,15ppm Au; 1.3ppm Ag), (Wanhainen et al. 2012, Boliden 2017). The close spatial relation between Aitik, further IOCG style mineralization and the Nautanen Deformation Zone (NDZ), a crustal-scale, approximately N-S trending shear system provides important insights into the complex connection between deformation, reactivated fault systems and the different mineralizing events affecting the area during the Svecofennian period (1.9-1.8 Ga). Whereas this connection is well constrained within the Gällivare mining district (c.f. Martinsson and Wanhainen 2004, Wanhainen et al. 2012, Bauer et al. 2018, Lynch et al. 2018), the northern and southern continuations of the NDZ and its potential to host further mineralization remain unknown. During this study, an area around the Kiskamavaara Cu-Co-Au mineralization was investigated to link its tectonic evolution with regional metallogenic events and compare its alterations and structural regime to that of the highly prospective NDZ. It is suggested that the region was affected by at least two deformation events, D1 and D2, both causing a characteristic alteration assemblage, structural patterns and related mineralization. The identification of pseudotachylitic structures and supergene mineralization argues for a late, brittle, upper crustal event with hydrothermal character during D2. Constraining the Kiskamavaara Cu-Co-Au mineralization to this event allows to propose a genetic link to the known IOCG-style mineralization in the Nautanen area that are generally related to a late, 1.80 Ga period of hydrothermal activity. It is suggested that the Cu-Au mineralization in the Kiskamvaara and Nautanen area formed under similar conditions, hence arguing for a single high strain zone in favor over several locally constrained zones of crustal weakening. If supported in further studies, this finding of a highly prospective NDZ beyond its known extend, might justify more intense exploration in highly strained lithologies between the Kiskamavaara and Nautanen area, as well as north of Mattavaara and south of Gällivare.

Place, publisher, year, edition, pages
2019.
National Category
Geology
Identifiers
URN: urn:nbn:se:ltu:diva-74068OAI: oai:DiVA.org:ltu-74068DiVA, id: diva2:1318589
External cooperation
University of Oulu; Talga Resources
Subject / course
Student thesis, at least 30 credits
Educational program
Geosciences, master's level (120 credits)
Supervisors
Examiners
Available from: 2019-05-29 Created: 2019-05-28 Last updated: 2019-05-29Bibliographically approved

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CiteExportLink to record
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