Minerals 2012, 2(4), 385-416; doi:10.3390/min2040385
Article

Geology and Age Constraints on the Origin of the Intrusion-Related, Sheeted Vein-Type Åkerberg Gold Deposit, Skellefte District, Sweden

1 Laboratory for Isotope Geology, Swedish Museum of Natural History, P.O. Box 50007, Stockholm 10405, Sweden 2 Boliden Mineral AB, Boliden 93681, Sweden 3 Department of Geology, Lund University, Sölvegatan 12, Lund SE-22362, Sweden 4 Department of Geological Sciences, Stockholm University, Stockholm 10691, Sweden
* Author to whom correspondence should be addressed.
Received: 11 September 2012; in revised form: 21 October 2012 / Accepted: 23 October 2012 / Published: 31 October 2012
(This article belongs to the Special Issue Advances in Economic Minerals)
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Abstract: The Early Proterozoic (~1.9 Ga) Skellefte mining district in northern Sweden hosts abundant base metal deposits, but there are also gold-only deposits. The Åkerberg gold ore is unusual given the noted lack of alteration, a scarcity of sulfides and gold associated with thin (mm-cm wide) parallel quartz veins hosted in a gabbro. The gold content is positively correlated with the density of quartz veins, but gold often occurs between veins and also in parts of the gabbro where there is no veining. The gabbro is intruded by a granodiorite and associated pegmatite bodies, and U-Pb dating of zircon and baddeleyite suggest that these lithologies developed close in time at around 1.88 Ga ago. There are no primary inclusions in quartz veins, but different types of secondary aqueous inclusions occur. The Åkerberg ore is interpreted as a sheeted vein complex, with veins constrained to tensional cracks induced when a granodioritic magma intruded the competent, sheet-like gabbro intrusion. It is suggested that unmixing of the felsic magma also produced pegmatite bodies and a gel-like melt which invaded fractures in the gabbro and deposited silica. In a comparison, the Åkerberg ore shares many characteristics with the intrusion-related style of gold mineralizations.
Keywords: Skellefte district; gold ore; sheeted vein complex; U-Pb dating; fluid inclusions; intrusion-related style

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MDPI and ACS Style

Billström, K.; Mattson, B.; Söderlund, U.; Årebäck, H.; Broman, C. Geology and Age Constraints on the Origin of the Intrusion-Related, Sheeted Vein-Type Åkerberg Gold Deposit, Skellefte District, Sweden. Minerals 2012, 2, 385-416.

AMA Style

Billström K, Mattson B, Söderlund U, Årebäck H, Broman C. Geology and Age Constraints on the Origin of the Intrusion-Related, Sheeted Vein-Type Åkerberg Gold Deposit, Skellefte District, Sweden. Minerals. 2012; 2(4):385-416.

Chicago/Turabian Style

Billström, Kjell; Mattson, Benny; Söderlund, Ulf; Årebäck, Hans; Broman, Curt. 2012. "Geology and Age Constraints on the Origin of the Intrusion-Related, Sheeted Vein-Type Åkerberg Gold Deposit, Skellefte District, Sweden." Minerals 2, no. 4: 385-416.

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