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Contrasting fluid types involved in the genesis of ca. 1.89 Ga, syngenetic polymetallic sulfide deposits, Falun and Zinkgruvan, Bergslagen, Sweden
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.ORCID iD: 0000-0002-2634-6953
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.ORCID iD: 0000-0003-1867-2342
2017 (English)In: Mineral Resources to Discover: Proceedings of the 14th SGA Biennial Meeting, Québec City, Canada, Society for Geology Applied to Mineral Deposits , 2017, Vol. 2, p. 613-616Conference paper, Oral presentation with published abstract (Refereed)
Abstract [en]

Metamorphosed polymetallic sulfide deposits in Bergslagen, Sweden, are currently divided into 1: Stratabound volcanic-associated limestone-skarn Zn-Pb-Ag-Cu-Au sulfide deposits (SVALS) and 2: Stratiform ash-siltstone hostedZn-Pb-Ag sulfide deposits (SAS). It has not been completely resolved if these deposit types formed from similar hydrothermal fluids. Recent investigations at the Falun SVALS deposit and the Zinkgruvan SAS deposit suggest that fluids of contrasting pH, ƒO2, salinity and Twere involved in their origin. Whereas Falun formed by cooling and neutralization of acidic (pH<4), hot (300-400ºC) and reducing fluids carrying metals and sulfur together, Zinkgruvan formed by reduction of oxidized brines at a near-neutral pH. Falun is a vent-proximal, synvolcanic carbonate-replacement deposit with similarities to VMS and skarn deposits, whereas Zinkgruvan is a post-volcanic, exhalative deposit with similarities to some SEDEX deposits. Our results suggest that the different character of SVALS and SAS deposits in part are functions of fundamental differences in fluid chemistry, controls on sulfide precipitation and relationship to volcanism.

Place, publisher, year, edition, pages
Society for Geology Applied to Mineral Deposits , 2017. Vol. 2, p. 613-616
National Category
Geology
Research subject
Ore Geology
Identifiers
URN: urn:nbn:se:ltu:diva-65384OAI: oai:DiVA.org:ltu-65384DiVA, id: diva2:1136577
Conference
14th SGA Biennial Meeting, Québec City, Canada, August 20-23, 2017
Available from: 2017-08-28 Created: 2017-08-28 Last updated: 2017-11-24Bibliographically approved

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Jansson, NilsKampmann, Tobias Christoph

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