Skip to Main content Skip to Navigation
Journal articles

The role of paragneiss assimilation in the origin of the Voisey's Bay Ni-Cu sulfide deposit, Labrador: Multiple S and Fe isotope evidence

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
Complete list of metadatas

https://hal-insu.archives-ouvertes.fr/insu-00861844
Contributor : Adminhal Univbrestbu <>
Submitted on : Friday, September 13, 2013 - 4:00:05 PM
Last modification on : Monday, September 7, 2020 - 4:34:03 PM

Links full text

Identifiers

Collections

Citation

R.S. Hiebert, A. Bekker, B.A. Wing, Olivier Rouxel. The role of paragneiss assimilation in the origin of the Voisey's Bay Ni-Cu sulfide deposit, Labrador: Multiple S and Fe isotope evidence. Economic Geology, Society of Economic Geologists, 2013, 108 (6), pp.1459-1469. ⟨10.2113/econgeo.108.6.1459⟩. ⟨insu-00861844⟩

Share

Metrics

Record views

193