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Stratigraphic column of the Guldsmedshyttan syncline area based on the work of Lundström (1983) and Carlon and Bleeker 1988 for the Storsjön and Mårdshyttan formations and Jansson et al., 2018 for the Uksen formation. Abbreviations: Fsp = feldspar, Hem = hematite, Mag = magnetite, Qz = quartz. Figure is modified after Jansson et al. (2018).
Contexts in source publication
Context 1
... bimodal intrusives affected these metavolcanics during back arc rifting (Oen et al., 1982;Stephens et al., 2009;Jansson, 2011). Carbonate rocks and altered calc-silicates of the overlying Uksen formation are host rocks of most metallic and sulphide ore deposits and form the top of the volcanic sequence ( Fig.3; Lundström, 1983;Carlon and Bleeker, 1988;Allen et al., 1996;Stephens et al., 2009). ...
Context 2
... stratigraphy of the Guldsmedshyttan syncline comprises the Storsjön Formation, Uksen formation and Mårdshyttan formation (Fig. 3). The oldest rocks in the area are rhyolites that occur on both sides of the synclinal structure and are metamorphosed by 1.91-1.89 GDG intrusions ( Stephens et al., 2009;Jannson, 2018). These rhyolites are interbedded with alternating quartz and metallic ore mineral banding. At the top of the sequence the rhyolites are finer-grained ...
Context 3
... top of the metavolcanics sequence limestones and skarns occur (Fig. 3). This interval shows e.g., carbonate replacement with sulphide minerals and garnet resorption, which indicates that the rocks are affected by metamorphism and metasomatism. Hydrothermal fluids with high magnesium and potassium contents extracted from felsic intrusive rocks that were present during and after rock formation reached the ...
Context 4
... are the youngest rock types in the study area and contain deformed andalusite (Fig. 3, fig. 8F). Andalusite forms during metamorphic processes that occurred after deposition, which suggests the deformation phase that deformed the andalusite grains was younger than rock deposition. Since not all andalusite grains are deformed metamorphism likely outlasted the deformation phase, which is also suggested by Oen et al., ...
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