Hydrothermal alteration, lithogeochemical marker units and vectors towards mineralisation at the Svärdsjö Zn-Pb-Cu deposit, Bergslagen, Sweden ...

• Main Authors: Fahlvik, Anton, Kampmann, Tobias C., Jansson, Nils F.
• Format: Dataset
• Language: unknown
• Published: Taylor & Francis 2022
• Subjects: Biophysics; Biochemistry; Microbiology; FOS Biological sciences; Physiology; Environmental Sciences not elsewhere classified; Chemical Sciences not elsewhere classified; Ecology; Biological Sciences not elsewhere classified; Cardiology; Fennoscandian
• Online Access: https://dx.doi.org/10.6084/m9.figshare.21261716.v1; https://tandf.figshare.com/articles/dataset/Hydrothermal_alteration_lithogeochemical_marker_units_and_vectors_towards_mineralisation_at_the_Sv_rdsj_Zn-Pb-Cu_deposit_Bergslagen_Sweden/21261716/1

The Svärdsjö Zn-Pb-Cu deposit is situated in the heavily mineralised Bergslagen lithotectonic unit of the Fennoscandian shield, south-central Sweden. Intense hydrothermal alteration followed by a strong overprint by deformation and metamorphism during the Svecokarelian orogeny complicate interpretation of the local geology. Integration of whole-rock lithogeochemical and petrographic methods has allowed the mainly dacitic volcanic host succession and effects of ore-related hydrothermal alteration to be characterised. Mineralisation is hosted by 2–15 m thick, commonly skarn-altered dolomitic marble interbeds. Zones of strong–intense hydrothermal chlorite-sericite alteration envelop the marble units, recording mass gains of Fe and Mg, as well as Na depletion. Minerals such as cordierite, anthophyllite and sillimanite formed in these rocks during regional metamorphism. Mineralisation via sub-seafloor replacement is suggested for the deposit based on alteration zoning and the irregular, stratabound, marble-hosted ...