The Nadok ore body at Laisvall is particularly rich in sphalerite ZnS. Rounded quartz grains of different sizes are cemented by sphalerite yellowish. Scale bar is 2mm. A number of sandstone-hosted Pb-Zn impregnation ores occur along the Caledonian margin, and among these the largest and most well-studied is the Laisvall deposit, located about 35 km NW of Arjeplog. A common origin of these ores is anticipated, however, the genetic aspects are still not fully understood. The timing of ore mineral deposition is crucial in any ore modelling, and the current project aims to further constrain the age of ore-forming processes by dating sphalerite using the Rb-Sr method which is one of the major ore components. However, available radiometric data do not allow any rigorous interpretation to be made about the age of the ore-forming stage s.
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