| Reference Type | Journal (article/letter/editorial) |
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| Title | Fahlore as a petrogenetic indicator: Keno Hill Ag-Pb-Zn District, Yukon, Canada |
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| Journal | Mineralogical Magazine |
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| Authors | Sack, R. O. | Author |
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| Lynch, J. V. G. | Author |
| Foit, F. | Author |
| Year | 2003 (October) | Volume | 67 |
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| Issue | 5 |
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| Publisher | Mineralogical Society |
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| DOI | doi:10.1180/0026461036750141Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 243479 | Long-form Identifier | mindat:1:5:243479:1 |
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| GUID | 0 |
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| Full Reference | Sack, R. O., Lynch, J. V. G., Foit, F. (2003) Fahlore as a petrogenetic indicator: Keno Hill Ag-Pb-Zn District, Yukon, Canada. Mineralogical Magazine, 67 (5) 1023-1038 doi:10.1180/0026461036750141 |
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| Plain Text | Sack, R. O., Lynch, J. V. G., Foit, F. (2003) Fahlore as a petrogenetic indicator: Keno Hill Ag-Pb-Zn District, Yukon, Canada. Mineralogical Magazine, 67 (5) 1023-1038 doi:10.1180/0026461036750141 |
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| Abstract/Notes | AbstractFahlores [~(Cu,Ag)10(Zn,Fe)2Sb4S13] from the Keno Hill mining district, central Yukon, Canada record virtually the entire petrogenetic history of a Cretaceous hydrothermal system extending over 40 km outward from the Mayo Lake granitic pluton. These fahlores are an essential constituent of polymetallic sulphide veins developed in a graphitic Mississippian quartzite, where they occur in association with sphalerite, pyrargyrite, galena and siderite. Fahlores exhibit pronounced east-west zoning in average Ag/(Ag+Cu) and Zn/(Zn+Fe) values, with these simultaneously increasing and decreasing from east to west over 20 km of hydrothermal activity. These zonations are coupled with average Ag/(Ag+Cu) and Zn/(Zn+Fe) values in fahlore roughly paralleling the 300°C isotherm for fahlores in equilibrium with pyrargyrite, miargyrite and sphalerite in the simple system Ag2S-Cu2S-ZnS-FeS-Sb2S3. Early high-Ag, high-Zn fahlores from the eastern and western mines have Ag/(Ag+Cu) and Zn/(Zn+Fe) values requiring temperatures ≥400°C, in agreement with temperatures established from the As-content of arsenopyrite coexisting with pyrite, pyrrhotite and sphalerite. Ag/(Ag+Cu) and Zn/(Zn + Fe) values in later, main-stage fahlores are consistent with the 250–310°C range of temperatures established for boiling of Keno Hill fluids. Finally, Ag- and Fe-rich fahlores were produced by retrograde Fe-Zn exchange with sphalerite or crystallized from late-stage epithermal fluids which produced polybasite, stephanite, acanthite and wire silver. One such fahlore exhibits unmixing into high-Ag and low-Ag varieties. This is the first reported miscibility gap for freibergite fahlores and confirms the earlier prediction of such gaps. |
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