| Title | The Role of Paragneiss Assimilation in the Origin of the Voisey's Bay Ni-Cu Sulfide Deposit, Labrador: Multiple S and Fe Isotope Evidence |
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| Author | Hiebert, R S; Bekker, A; Wing, B A; Rouxel, O |
| Source | Economic geology and the bulletin of the Society of Economic Geologists vol. 108, 2013 p. 1459-1469, https://doi.org/10.2113/econgeo.108.6.1459 |
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| Year | 2013 |
| Alt Series | Earth Sciences Sector, Contribution Series 20140557 |
| Publisher | Society of Economic Geologists |
| Document | serial |
| Lang. | English |
| Media | paper; digital; on-line |
| File format | pdf |
| Province | Newfoundland and Labrador |
| NTS | 14C/04; 14C/05; 14D/08; 14D/01 |
| Area | Voisey's Bay |
| Lat/Long WENS | -62.0833 -61.5000 56.3333 56.1667 |
| Subjects | economic geology; geochemistry; igneous and metamorphic petrology; metallic minerals; sulphur isotope ratios; stable isotope studies; mineral deposits; paragneisses; sulphide deposits; magmatic
deposits; magmatism; magma differentiation; magmatic rocks; plutons |
| Illustrations | geologic sketch maps; equations; graphs; tables |
| Program | Targeted Geoscience Initiative (TGI-4) Mafic-Ultramafic Ore Systems |
| Released | 2013 08 13 |
| Abstract | Isotopic and geochemical studies conducted on the Voisey's Bay deposit, Labrador, Canada, suggest crustal contamination of the primary magma as a trigger for sulfur saturation and formation of the
deposit. The use of multiple S isotopes has allowed for the identification of a bacterial sulfate reduction biosignature in the Tasiuyak gneiss in the footwall to the Voisey's Bay deposit. This putative biosignature is preserved in the deposit even
at high silicate magma/sulfide melt ratios (R-factor) and links the S present in the Voisey's Bay deposit to the Tasiuyak gneiss. Iron isotopes in the Voisey's Bay deposit have been reset to magmatic values at R-factors > ˜100, but S isotope data can
be used to model higher R-factors. A contamination model results in calculated R-factors of 433 ± 177. The multiple S isotope data are a new proxy to directly link S from the deposit to crustal S sources even in deposits with high R-factors where the
equilibration with large amounts of silicate magma can make interpreting a link between the deposit and the sulfur source difficult |
| GEOSCAN ID | 296193 |
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