Sulphur isotope characteristics of metamorphosed Cu(Zn) volcanogenic massive sulphide deposits in the Norwegian Caledonides

Sulphur isotope characteristics of metamorphosed Cu(Zn) volcanogenic massive sulphide deposits... Sulphur isotope data are presented for 86 separated samples of pyrite and other sulphides and four anhydrites from within five massive sulphide deposits in the Norwegian Caledonides, each of which was metamorphosed at different facies conditions during the Caledonian Orogen. Although the isotopic compositions fall within a relatively limited range ( δ 34 S ranging from −8 to +12‰, with most samples clustered between −2 and +9‰), each deposit is isotopically distinct. Variations between average δ 34 S values for the various deposits, and between sub-groups identified in the data for the Sulitjelma, Gjersvik and Løkken deposits are best explained by differences in Eh, pH and other physico-chemical conditions during syngenetic formation and/or mildly differing sources of sulphur. Regional metamorphism did not lead to an extensive degree of homogenisation, and it is proposed that primary patterns have been largely preserved. Lithostratigraphic control of isotope compositions is evident and relative enrichment in 34 S in disseminated (distal) and stockwork (feeder zone) ore facies is a feature of several deposits. Although the metamorphic episode was effectively a closed system as far as S isotopes are concerned, the structurally-controlled mobilisation of sulphides in some parts of massive sulphide lenses at Sulitjelma has apparently led to some considerable modification of S-isotope signatures, typified by pyrites with δ 34 S values of −8 to −4‰. However, this would appear to have taken place on a highly localised basis. The data shed new light on the origin of the abundant anhydrite at Sulitjelma, strongly suggesting that this mineral formed by oxidation of pre-existing sulphides subsequent to syngenetic deposition. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Chemical Geology Elsevier

Sulphur isotope characteristics of metamorphosed Cu(Zn) volcanogenic massive sulphide deposits in the Norwegian Caledonides

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Publisher
Elsevier
Copyright
Copyright © 1997 Elsevier Ltd
ISSN
0009-2541
eISSN
1872-6836
D.O.I.
10.1016/S0009-2541(96)00119-2
Publisher site
See Article on Publisher Site

Abstract

Sulphur isotope data are presented for 86 separated samples of pyrite and other sulphides and four anhydrites from within five massive sulphide deposits in the Norwegian Caledonides, each of which was metamorphosed at different facies conditions during the Caledonian Orogen. Although the isotopic compositions fall within a relatively limited range ( δ 34 S ranging from −8 to +12‰, with most samples clustered between −2 and +9‰), each deposit is isotopically distinct. Variations between average δ 34 S values for the various deposits, and between sub-groups identified in the data for the Sulitjelma, Gjersvik and Løkken deposits are best explained by differences in Eh, pH and other physico-chemical conditions during syngenetic formation and/or mildly differing sources of sulphur. Regional metamorphism did not lead to an extensive degree of homogenisation, and it is proposed that primary patterns have been largely preserved. Lithostratigraphic control of isotope compositions is evident and relative enrichment in 34 S in disseminated (distal) and stockwork (feeder zone) ore facies is a feature of several deposits. Although the metamorphic episode was effectively a closed system as far as S isotopes are concerned, the structurally-controlled mobilisation of sulphides in some parts of massive sulphide lenses at Sulitjelma has apparently led to some considerable modification of S-isotope signatures, typified by pyrites with δ 34 S values of −8 to −4‰. However, this would appear to have taken place on a highly localised basis. The data shed new light on the origin of the abundant anhydrite at Sulitjelma, strongly suggesting that this mineral formed by oxidation of pre-existing sulphides subsequent to syngenetic deposition.

Journal

Chemical GeologyElsevier

Published: Mar 14, 1997

References

  • Metamorphic peak geothermobarometry in the Furulund Group, Sulitjelma, Scandinavian Caledonides: Implications for uplift
    Boyle, A.P.; Westhead, K.
  • Metamorphism in the Scandinavian Caledonides
    Bryhni, I.; Andreasson, P-G.

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