• journal_title：Economic Geology
• Contributor：David Selby ; Karen D. Kelley ; Murray W. Hitzman ; Jerry Zieg
• Publisher：Society of Economic Geologists
• Date：2009-
• Format：text/html
• Language：en
• Identifier：10.2113/gsecongeo.104.3.437
• journal_abbrev：Economic Geology
• issn：0361-0128
• volume：104
• issue：3
• firstpage：437
• section：Scientific Communications

New Re-Os data for chalcopyrite, bornite, and pyrite from the carbonate-hosted Cu deposit at Ruby Creek (Bornite), Alaska, show extremely high Re abundances (hundreds of ppb, low ppm) and contain essentially no common Os. The Re-Os data provide the first absolute ages of ore formation for the carbonate-hosted Ruby Creek Cu-(Co) deposit and demonstrate that the Re-Os systematics of pyrite, chalcopyrite, and bornite are unaffected by greenschist metamorphism. The Re-Os data show that the main phase of Cu mineralization predominantly occurred at 384 ± 4.2 Ma, with an earlier phase possibly at ~400 Ma. The Re-Os data are consistent with the observed paragenetic sequence and coincide with zircon U-Pb ages from igneous rocks within the Ambler metallogenic belt, some of which are spatially and genetically associated with regional volcanogenic massive sulfide deposits. The latter may suggest a temporal link between regional magmatism and hydrothermal mineralization in the Ambler district. The utility of bornite and chalcopyrite, in addition to pyrite, contributes to a new understanding of Re-Os geochronology and permits a refinement of the genetic model for the Ruby Creek deposit.