The Source Of Ore Fluids And Solutes In Archaean Lode-Gold Deposits Of Western Australia

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Journal Article: The Source Of Ore Fluids And Solutes In Archaean Lode-Gold Deposits Of Western Australia

Abstract
The ore fluids which produced Archaean lode-gold deposits in sub-amphibolite facies rocks of the Yilgarn Block, Western Australia, are characteristically low- to moderate-salinity H2O-CO2-CH4 fluids. Wall-rock alteration and ore deposition were from a generally reducing, near-neutral fluid at 200-350°C and 1-3 kbar, although more oxidising fluids produced some assemblages in the giant Golden Mile deposit. Gold was transported as reduced-sulphur complexes. The ore fluid composition and stable and radiogenic isotope data indicate multiple sources for the fluid and solute. Deep plumbing systems are invoked, with the fluids being either metamorphic fluids that derived solutes from the lower and upper crusts, or fluids exsolved from deep-seated granitoids formed by anatexis of such crust.

Authors 
S. E. Ho, D. I. Groves, N. J. McNaughton and E. J. Mikucki








Published Journal 
Journal of Volcanology and Geothermal Research, 1992





DOI 
Not Provided
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Citation

S. E. Ho,D. I. Groves,N. J. McNaughton,E. J. Mikucki. 1992. The Source Of Ore Fluids And Solutes In Archaean Lode-Gold Deposits Of Western Australia. Journal of Volcanology and Geothermal Research. (!) .