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Fluid inclusion studies of the high-grade Ashuanipi Complex, Superior Province, Canada: retrograde P-T path and conditions of gold formation

Publication date1992
Abstract

Gold-bearing Algoma-type iron formations and their high-grade metamorphic host rocks of the Ashuanipi Complex, Superior Province, Canada, have been the subject of a microthermometric fluid inclusion study. Isochores calculated for early C0₂-rich fluid inclusions, in conjunction with published geothermobarometric data, indicate a clockwise retrograde P-T-t path for the Ashuanipi Complex. Late low salinity H₂0 fluid inclusions are spatially associated with gold showings and yield isochores which suggest, together with arsenopyrite thermometry and metamorphic petrology, that gold was precipitated, at least partially, during post-peak metarmorphic cooling and uplift. One of the gold occurrences is characterized by CH₄-N₂-rich fluids which could be responsible for the main gold deposition event or for secondary gold enrichment processes in that showing.

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Keywords
  • Fluid inclusions
  • Gold mineralization
  • Metamorphism
  • Ashuanipi Complex
  • Superior Province
  • Canada
Citation (ISO format)
MORITZ, Robert, CHEVÉ, Serge. Fluid inclusion studies of the high-grade Ashuanipi Complex, Superior Province, Canada: retrograde P-T path and conditions of gold formation. In: Schweizerische mineralogische und petrographische Mitteilungen, 1992, vol. 72, n° 1, p. 129–134. doi: 10.5169/seals-54902
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ISSN of the journal0036-7699
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