In his paper on “large-scale hydrothermal zoning reflected in the tetrahedrite–freibergite solid solution, Keno Hill Ag–Pb–Zn district, Yukon”, Lynch (1989) documented east-to-west trends of increasing Ag/(Ag + Cu) and decreasing Zn/(Zn + Fe) in the solid-solution series (Cu,Ag)10(Zn,Fe)2Sb4S13 – (Ag,Cu)10(Fe,Zn)2 Sb4S13, occurring over a scale of 25 km. This tetrahedrite solid-solution occurs in “epithermal” polymetallic fissure–vein deposits in graphitic quartzite and constitute the distal portion of a laterally zoned, fossil hydrothermal system extending over 40 km from the Mayo Lake Pluton to the east (Lynch...

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