Evidence of remobilisation within the Palaeoproterozoic Aitik Cu-Au-Ag deposit, northern Sweden: A sulphur isotope study

摘要

Sulphur isotope data on sulphides and sulphates from the Aitik Cu-Au-Ag deposit, northern Sweden, are consistent with one, single mineralizing event responsible for the formation of the deposit. The mineralizing event is related to 1.89 Ga magmatism. Several mineralization types within the deposit have developed due to multistage remobilisation of the primary disseminated and vein-type ore during deformation and metamorphism. This is concluded from the fact that all mineralization types have sulphur isotope signatures in a narrow spread around zero per mille, comparable with those of the primary, disseminated ore. A more positive average sulphur isotopic composition for sulphide-sulphate pairs however indicates that sulphate sulphur might have a different source than the magmatic source proposed for the sulphide sulphur.