Acknowledgements
This research was funded by Nordforsk Centre of Excellence for Resource
Extraction and Sustainable Arctic Communities (REXSAC, project no.
76938). Fieldwork was funded by Göran Gustafsson Foundation and
EU INTERACT (International Network for Terrestrial Research and
Monitoring in the Arctic) Transnational Access project ”Baseline
Conditions and Arctic Mining Impacts under Hydro-Climatic Change
(BCAM)”. Additionally this paper has been supported by the Kazan Federal
University Strategic Academic Leadership Program. We further acknowledge
Heike Siegmund (Dept. of Geological Sciences) at the laboratory at
Stockholm University for her helpful assistance during the sulfur
isotope analysis. The authors declare that they have no known competing
financial interests or personal relationships that could have appeared
to influence the work reported in this paper.