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Fluid-inclusion microthermometry was done on a barren carbonate vein and a gold-rich silicified carbonate vein. Fluid immiscibility is indicated by the coexistence of carbonic and aqueous inclusions in both carbonate and auriferous quartz. Primary fluid inclusions in the carbonate indicate CO2 dominance in the carbonic phase, homogenization temperatures of aqueous inclusions range from 191.8° to 343.9°C, and fluid pressures from 129 to 1448 bars. Primary fluid inclusions in auriferous quartz indicate significant amounts of CH4 in addition to CO2 in the carbonic phase, homogenization temperatures of aqueous inclusions range from 252.1° to 380.1°, and fluid pressures from 882 to 2436 bars. The study documents a systematic change in fluid composition and inferred temperature-pressure conditions from carbonate-vein formation, through auriferous silicification, to post–main-stage mineralization, euhedral quartz, and gold remobilization. The carbonate veins and silicification formed at similar temperatures, but at significantly different fluid pressures, which may indicate a) a difference in formation depths, b) a change of fluid regime from hydrostatic to lithostatic, or c) post-trapping modification of fluid inclusions. 1 Contribution to the Western Superior NATMAP Project Current Research 2002-C27 1 G. Chi et al. Resume : On a procede a l’analyse microthermometrique des inclusions fluides dans un filon de carbonates sterile et dans un filon de carbonates silicifie riche en or. La coexistence d’inclusions carboniques et aqueuses aussi bien dans les carbonates que dans le quartz aurifere est un indice de l’immiscibilite des fluides. Les inclusions fluides primaires dans les carbonates indiquent la dominance de CO2 dans la phase carbonique; les temperatures d’homogeneisation de ces inclusions aqueuses se situent entre 191,8 oC et 343,9 oC a des pressions des fluides variant de 129 a 1 448 bars. Les inclusions fluides primaires dans le quartz aurifere montrent des quantites appreciables de CH4 qui s’ajoutent a celles en CO2 dans la phase carbonique; les temperatures d’homogeneisation de ces inclusions aqueuses se situent entre 252,1 oC et 380,1 oC a des pressions des fluides variant de 882 a 2 436 bars. L’etude demontre un changement systematique de la composition des fluides et des conditions de temperature et de pression deduites, depuis la formation des veines de carbonates, puis de la silicification aurifere, de la formation de quartz automorphe ulterieure au stade principal de mineralisation et, enfin, de la remobilisation de l’or. La formation des filons de carbonate et la silicification se sont deroulees a des temperatures semblables, mais a des pressions des fluides nettement differentes ce qui pourrait indiquer : a) une difference dans les profondeurs de formation, b) un changement du regime des fluides, d’hydrostatique a lithostatique, ou c) une modification des inclusions fluides, subsequente a leur piegeage.

Preliminary fluid-inclusion microthermometry study of fluid evolution and temperature-pressure conditions in the Goldcorp High-Grade zone, Red Lake mine, Ontario