Abstract
ABSTRACT Metavolcanic rocks in the area north and northwest of Falun, Bergslagen, Sweden host numerous mineralisations and historic mines. The stratigraphy and formation ages of these metavolcanic rocks however remains unresolved on the local scale. This study aims to add at least some pieces to that puzzle by exploring age-constrains for the deposition of a metavolcaniclastic rock at Byngsbodberget, c. 15 km west-northwest of Falun. U-Pb SIMS analyses were conducted on zircon, from which a concordia age is calculated at 1900 ± 9 Ma and interpreted as the age of the main volcanic event that contributed material to the studied volcaniclastic rock. Based on observations of way-up indicators, this is thought to mark the lower parts of the local volcanic stratigraphy.
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