Re-Os SULFIDE (BORNITE, CHALCOPYRITE, AND PYRITE) SYSTEMATICS OF THE CARBONATE-HOSTED COPPER DEPOSITS AT RUBY CREEK, SOUTHERN BROOKS RANGE, ALASKA

• DOI: 10.2113/gsecongeo.104.3.437
• Publication Date: 2009-06-10T14:08:13Z
• Authors: D. Selby; K. D. Kelley; M. W. Hitzman; J. Zieg
• Keywords: Bornite; Geochronology; Marcasite

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) contain essentially no common Os. The provide first absolute ages ore formation Cu-(Co) demonstrate that systematics pyrite, bornite are unaffected by greenschist metamorphism. main phase mineralization predominantly occurred 384 ± 4.2 Ma, with an earlier possibly ~400 Ma. consistent observed paragenetic sequence coincide zircon U-Pb igneous rocks within Ambler metallogenic belt, some which spatially genetically associated regional volcanogenic massive sulfide deposits. latter may suggest a temporal link between magmatism hydrothermal in district. utility addition to contributes new understanding geochronology permits refinement genetic model deposit.